IDAHO MANUFACTURED HOME INSTALLATION STANDARD · IDAHO MANUFACTURED HOME INSTALLATION STANDARD...

IDAHOMANUFACTURED HOME

INSTALLATION STANDARD

January 1, 2004 Edition

State of IdahoDivision of Building Safety

Manufactured Housing Section

Idaho Manufactured Housing Association

IDAHOMANUFACTURED HOME

INSTALLATION STANDARD

Developed cooperatively by the

STATE OF IDAHODIVISION OF BUILDING SAFETY

MANUFACTURED HOUSING SECTION1090 East Watertower St.

MERIDIAN, IDAHO 83642

and the

IDAHO MANUFACTURED HOUSING ASSOCIATIONP.O. BOX 8605

BOISE, IDAHO 83707

January 1, 2004 Edition

Copies of this standard may be obtained from theIdaho Manufactured Housing Association.

A current copy of this standard is also on fileand can be reviewed or obtained from the

Office of the Idaho Division of Building Safety.

i

LIST OF FIGURES. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xv

CHAPTER 1GENERAL. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

000. LEGAL AUTHORITY. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

001. TITLE AND SCOPE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

002. WRITTEN INTERPRETATIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

003. ADMINISTRATIVE APPEALS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

004. MINIMUM. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

005. FIGURES. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

006. LICENSING. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

CHAPTER 2PERMITS AND INSPECTIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

201. PERMITS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 301. Installation and Alteration Permits. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 302. Alterations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 303. Multiple Permits. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 304. Fees. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

202. PLAN REVIEWS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 301. Plans. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

203. INSPECTIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 301. Local. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 302. State. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 303. Notification. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 304. Installer. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

204. INSPECTION CRITERIA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 301. Site Inspection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 302. Installation Inspection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 403. Utilities Inspection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

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CHAPTER 3GENERAL INSTALLATION STANDARDS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

301. GENERAL. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 701. Content. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 702. Installation Standard. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 703. Snow Loads. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 704. Unique Installations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 705. Manufacturer's Installation Instructions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 906. Unusual Installations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 907. Basic Requirement. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 908. Chassis Removal. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 909. Underfloor Ventilation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 910. Separation From Ground. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 911. Close Up. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 912. Compliance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 913. Approval. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 914. Temporary Placement. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

302. SITE PREPARATION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 901. Suitability of Site. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 902. Unforeseen Factors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 903. Grading. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1004. Erosion. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1005. Site. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1006. Frost Line. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1007. Vapor Retarder. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

303. APPROVED INSTALLATION MATERIALS AND COMPONENTS. . . . . . . . . . . . . . . 1001. Component and Materials Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1002. Testing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

304. MARRIAGE LINE CONNECTIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1101. General. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1102. Shimming. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1103. Ridge Beam Connections. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1104. Floor Connections. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1105. End Wall and Interior Wall Connections. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1306. Lag Bolts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1307. Sealing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1308. Patching. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

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305. FLOOD RESISTANCE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1301. Location. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1302. Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1303. Elevation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1304. Underfloor Enclosures. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

306. EGRESS REQUIREMENTS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1401. Egress. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1402. Inspection Approval. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1403. Stairs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1504. Permanent Construction Requirements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

CHAPTER 4STANDARD SET INSTALLATION STANDARDS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

401. GENERAL. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1701. Content. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1702. Frost Line. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

402. APPROVED INSTALLATION MATERIALS AND COMPONENTS. . . . . . . . . . . . . . . 1701. Footings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1702. Block Piers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1903. Block Pier Caps. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1904. Block Pier Shims. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2105. Block Pier Wedges. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2106. Prefabricated Piers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2107. Other piers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2108. Component and Materials Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2109. Testing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

403 INSTALLATION SUPPORT REQUIREMENTS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2101. Main Frame Supports. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2102. Perimeter Supports. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2203. Marriage Line Supports. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

Table 400-A. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2604. Height of Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

404. ANCHORING. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2701. Anchoring. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2702. Loads. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2703. Installation Instructions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2804. Testing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

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05. Ties. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2806. Spacing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2907. Certification. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2908. Alternate anchoring systems. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

CHAPTER 5PERMANENT FOUNDATION INSTALLATION STANDARDS. . . . . . . . . . . . . . . . . . . . . 31

501. GENERAL. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3101. Content. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3102. Frost Line. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

502. APPROVED INSTALLATION MATERIALS AND COMPONENTS. . . . . . . . . . . . . . . 3101. Footings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3102. Block Piers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3303. Block Pier Caps. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3304. Block Pier Shims. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3305. Block Pier Wedges. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3406. Prefabricated Piers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3407. Other piers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

503. INSTALLATION SUPPORT REQUIREMENTS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3401. Main Frame Supports. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3402. Perimeter Supports. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3503. Marriage Line Supports. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 354

Table 500-A. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3704. Height of Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

504. PERMANENT FOUNDATIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3801. Permanent Foundation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3802. Foundations for Existing Home. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4403. Basement Perimeter Support Foundation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4504. Grading. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4605. Drainage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4606. Real Property Designation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4607. Permits and Inspections. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46

506. ANCHORING. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4601. Anchoring. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4602. Loads. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4603. Ties. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4704. Spacing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4705. Certification. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47

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06. Alternate anchoring systems. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47

CHAPTER 6ELECTRICAL CONNECTIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49

601. GENERAL. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4901. Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49

602. ELECTRICAL FEEDER CONNECTIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4901. Power Supply. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49

603. SERVICE EQUIPMENT CONNECTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4901. Service Equipment on Manufactured Home. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4902. Service Clearances. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49

604. ELECTRICAL CROSSOVER CONNECTIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4901. Crossover Connection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4902. Chassis Bonding. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49

605. ELECTRICAL EQUIPMENT. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5101. Shipped Loose Equipment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5102. Bonding Strap Removal. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51

606. ELECTRICAL TESTING. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5101. Testing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51

CHAPTER 7PLUMBING CONNECTIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53

701. GENERAL. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5301. Connections. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5302. Installer. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5303. Location. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5304. Permits. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53

702. SHIP-LOOSE PLUMBING. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5301. Ship-Loose Plumbing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53

703. WATER CONNECTIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5301. Water Connections. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5302. Material. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5303. Water Valve Access. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5404. Water Utility Size. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54

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704. DRAIN AND SEWER CONNECTIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5401. Drain Connection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5402. Sewer Clean out Access. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56

705. PLUMBING ASSEMBLY. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56

706. PLUMBING TESTS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5701. Water Test. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5702. Drain Test. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58

CHAPTER 8MECHANICAL CONNECTIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59

801. GENERAL. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5901. Permits. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5902. Installations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59

802. MECHANICAL EQUIPMENT. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5901. Original Installations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5902. After Market Installations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5903. Equipment Support. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5904. Prohibited Installations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5905. Condensation Drains. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59

803. CROSSOVER DUCTS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5901. General. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5902. Crossover Ducts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59

804. APPLIANCE VENTING. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6201. Venting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6202. Dryer Exhaust Vents. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62

CHAPTER 9ACCESSORY BUILDINGS AND STRUCTURES. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65

901. GENERAL. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6501. Standards. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65

902. UNDERFLOOR ENCLOSURES. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6501. Requirement. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6502. Skirting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6503. Perimeter Foundations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65

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903. UNDERFLOOR VENTILATION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6501. Requirement. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65

904. UNDERFLOOR ACCESS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6701. Requirement. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6702. Skirting Access. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6703. Foundations and Ground Level Access. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6704. Floor Access. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6805. Stairway Access. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68

905. CARPORTS & AWNINGS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6801. Accessories. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6802. Site Built. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6803. Prefabricated. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6804. Windows and Doors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6805. Enclosure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6806. Wall Support. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6807. Wall Attachment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6808. Roof Support. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69

906. PORCHES. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6901. Accessory. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6902 Self Supportive. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6903. Code. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69

907. ATTACHED GARAGES. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6901. Accessory. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6902. Self Supportive. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6903. Code. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6904. Separation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69

908. RAMADAS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7201. Accessory. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7202. Clearance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7203. Self Supportive. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7204. Enclosures. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7205. Chimneys and Flues. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7206. Egress and Exit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72

909. ACCESS & EGRESS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7201. Requirement. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7202. Obstructions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72

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03. Enclosed Exit Doors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7204. Original Exit Door. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7205. Prohibited Construction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73

910. DECKS, PORCHES, LANDINGS, STAIRS, RAMPS & GUARDRAILS. . . . . . . . . . . . 7301. Construction Standard. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7302. Attachment to Manufactured Home. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7303. Required Installations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73

CHAPTER 10HEAT PRODUCING APPLIANCES. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75

1001. GENERAL. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7501. Listing Requirement. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7502. Installation Instructions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7503. Accessibility. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7504. Clearance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7505. Other Appliances. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7506. Operating Instructions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75

1002. RANGES & DRYERS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7501. Listed Standards. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7502. Clearances. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7503. Dryer Exhaust. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7504. Range Exhaust Vents. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75

1003. FURNACES, GAS STOVES, WATER HEATERS, & GAS FIREPLACES. . . . . . . . . . . 7601. Appliance Listing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7602. Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7603. Combustion Air. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7604. Flue Listing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7605. Appliance Compartment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7606. Securement. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76

1004. SOLID FUEL BURNING FIREPLACES & STOVES. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7701. Listing Standard. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7602. Minimum Stove Construction Requirements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7603. Labeling. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7604. Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77

1005. PELLET FIRED APPLIANCES. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7701. Installations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77

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DEFINITIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81

ACRONYMS AND ABBREVIATIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86

SUBJECT INDEX. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87

FIGURE INDEX. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91

SUPPLEMENTAL INFORMATION NOT A PART OF THE STANDARDLocal Government Contacts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Supplement Page 1

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Figure 301.1 Standard Set. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8Figure 301.2 Permanent Foundation Set. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8Figure 304.1 Ridge Beam Bolt Connection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12Figure 304.2 Floor Connection w/ Lag Screw . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12Figure 304.3 Floor Connection w/ Clips. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12Figure 304.4 Interior Wall Connections. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12Figure 304.5 End Wall Connections. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12Figure 306.1 Stairs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14Figure 402.1 Precast Concrete Pier Pad. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18Figure 402.2 Poured Concrete Pier Pad. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18Figure 402.3 Double Layer Wood Pier Pad. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18Figure 402.4 Single Layer Wood Pier Pad. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18Figure 402.5 Wood Pier Pad. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18Figure 402.6. Continuous Concrete Footing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18Figure 402.7 Typical Concrete Block Pier. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20Figure 402.8 Typical Double Stack Concrete Block Pier. . . . . . . . . . . . . . . . . . . . . . . . . . . . 20Figure 402.9 Typical Block Pier Detail. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20Figure 402.10 Typical Prefabricated Pier. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20Figure 403.1 Support System. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22Figure 403.2 Perimeter Pier w/ Transverse Joists. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24Figure 403.3 Perimeter Pier w/ Longitudinal Joists. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24Figure 403.4 512 Sq. In. Pier Pad. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24Figure 403.5 1024 Sq. In. Pier Pad. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24Figure 406.1 Frame Tie Down Detail. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28Figure 406.2 Main Frame Tie Down Strap Connection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28Figure 502.1 Precast Concrete Pier Pad. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31Figure 502.2 Poured Concrete Pier Pad. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31Figure 502.3 Typical Concrete Block Pier. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32Figure 502.4 Typical Double Stack Concrete Block Pier. . . . . . . . . . . . . . . . . . . . . . . . . . . . 32Figure 502.5 Typical Block Pier Detail. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32Figure 502.6 Typical Prefabricated Pier. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32Figure 503.1 Support System. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22Figure 504.1A Poured Concrete Permanent Foundation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39Figure 504.1B 8" x 8" x 16" Concrete Block Permanent Foundation. . . . . . . . . . . . . . . . . . . 39Figure 504.1C Pressure Treated Wood Permanent Foundation. . . . . . . . . . . . . . . . . . . . . . . . 39Figure 504.2A Concrete Foundation Plan. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40Figure 504.2B Section Through Concrete Foundation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40Figure 504.3A Building Section. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42Figure 504.3B Foundation Section Detail. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42Figure 504.3C Foundation Elevation Detail. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42Figure 504.4A Cross Section Through Basement. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43Figure 504.4B Basement Foundation Plan. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43Figure 505.1 Main Frame Tie Down Strap Connection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47

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Figure 603.1 Service Conductor Clearances Underground Feeder. . . . . . . . . . . . . . . . . . . . 50Figure 605.1 Ship-Loose Light Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50Figure 605.2 Ship-Loose Fan Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50Figure 703.1 Concealed Water Crossover Connection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55Figure 703.2 Exposed Water Crossover Connection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55Figure 704.1 Drain Line Connection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55Figure 802.1 Mechanical Equipment Support. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60Figure 803.1 Crossover Duct Connection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60Figure 804.1 Attached Garage Mechanical Vents. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63Figure 804.2 Dryer Duct Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63Figure 902.1 Underfloor Enclosures. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66Figure 902.2 Typical Recessed Porch Detail. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66Figure 905.1 Carport Connection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70Figure 906.1 Porch Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70Figure 907.1 Attached Garage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71Figure 908.1 Ramada Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71Figure 1004.1 Wood Stove Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78Figure 1005.1 Sidewall Ventilation Termination. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78

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100. LEGAL AUTHORITY. In accordance with Section 44-2201(2), IdahoCode, the Idaho Division of Building Safety(herein referred to as Division) is authorized topromulgate rules specifying standardizedinstallation instructions for manufacturedhomes. These rules constitute a preemptivestatewide standard and no other code,standard, or regulation shall be used regardingthe installation of manufactured homes, exceptas provided for in Subsection 301.04 andSubsection 304.03.b.

101. TITLE AND SCOPE. These rules shall be cited as the "IdahoManufactured Home Installation Standard" oras "IMHIS." These rules apply to personsengaged in the business of manufacturing,selling, siting, installing, servicing, repairing, altering, or preparing for transport (commonlycalled 'tear down'), manufactured homes in thestate of Idaho. Within this standard the phrase"manufactured home" includes mobile home.

102. WRITTEN INTERPRETATIONS. There are no written statements which pertainto the interpretation of these standards.

103. ADMINISTRATIVE APPEALS. There are no provisions for administrativeappeal of the requirements outlined herein.

104. MINIMUM STANDARDS.This standard provides minimum statewidestandards for the safety of the consumer,general public, and the owners and occupantsof manufactured homes regulated by thisstandard. This standard may be exceeded by ahomeowner, contractor, or dealer, but nojurisdiction shall require a person to exceed thisstandard, except as permitted by Section67-6509A, Idaho Code, regarding siting withinresidential areas.

105. FIGURES.Every figure used in this standard pertainsspecifically to the Section(s) or Subsection(s)which references it. Figures will not show everymethod described by the narrative in thereferencing Section or Subsection. They areintended to aid the user of this standard byvisually describing requirements of thereferencing Section or Subsection. Therequirements that are narratively prescribed inthe referencing Section or Subsection must becomplied with regardless of the specific detailswhich may be shown in the figures. Analternative configuration, design, or technique,which can be shown to comply with thenarratively prescribed requirements will beacceptable. Also, an alternative configuration,design, or technique, which can be shown byengineering calculation or demonstrated byexperience or testing to meet or exceed therequirements of the associated Section orSubsection, and which is approved by theDivision and the Manufactured HomeInstallation Committee, may be acceptable.

106. LICENSING.Pursuant to Title 44, Chapter 21, Idaho Code,the regulation and control of those personsengaged in the business of manufacturing,selling, installing, servicing, or preparing fortransport (commonly called 'tear down'),manufactured homes is necessary to protect thehealth and safety of the citizens of Idaho. Tothat end, it shall be unlawful for any person toengage in business as a manufacturer ofmanufactured homes, a manufactured homedealer, manufactured home broker,manufactured home installer, manufacturedhome service company or a manufactured homesalesman without being duly licensed asprovided for in IDAPA 07.03.11, "RulesGoverning Manufactured/Mobile Home

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Licensing," Division of Building Safety,IDAPA 07.03.11.

107. -- 199. RESERVED.

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201. PERMITS.

01. Installation and Alteration Permits. Asrequired by Title 44, Chapter 22, Idaho Code,permits shall be obtained, using applicationforms furnished by the authority havingjurisdiction, before installing a manufacturedhome on a building site or in a park. Thisincludes manufactured homes set up for displayin manufactured home parks, mobile homeparks, subdivisions, and residential lots, andthat are occupied on a sales lot.

a. Exception: Installation permits are notrequired for unoccupied manufacturedhomes which are temporarily displayed ona sales lot or are in storage.

02. Alterations. No alteration may be made bya dealer or installer which takes a newmanufactured home out of compliance withHUD approved designs. No alteration may bedone to a new manufactured home withoutwritten approval by the manufacturer and aninspection by the Division of Building Safety.

03. Multiple Permits. Multiple permits maybe required by the authority having jurisdictionwhen the proposed work involves two (2) ormore of the following code areas: installation,structural, electrical, plumbing, or mechanical.Permits are to be obtained prior to the start ofproposed work.

04. Fees. Permit fees shall be those establishedby the authority having jurisdiction.

202. PLAN REVIEWS.

01. Plans. The authority having jurisdictionmay require plans to be submitted beforeinstalling a manufactured home and/orconstructing additions thereto.

a. Plans shall be of sufficient clarity toindicate the nature and extent of the workproposed.

203. INSPECTIONS.

01. Local. Pursuant to Section 44-2202, IdahoCode, all local jurisdictions which have adopteda building code shall issue permits and inspectall manufactured/mobile home installations forthe purpose of determining compliance withthis standard.

02. State. All electrical and plumbingconnections shall be inspected by the state orauthorized local authority having jurisdiction.

03. Notification. Persons involved in doingwork shall notify the responsible inspectingagency and that agency shall perform requestedinspections within a reasonable time.

04. Installer. All installations shall beinspected by a licensed installer or a responsiblemanaging employee (RME) and a copy of suchinspection records, using a Division approvedform, shall be provided to the homeowner uponcompletion of the inspection.

204. INSPECTION CRITERIA.

01. Site Inspection. It is recommended a "siteinspection" be performed by the dealer or hisrepresentative and the customer prior to theinstallation of the manufactured home to verifythat:

a. All required installation, structural, andplumbing, permits have been obtained;

b. Minimum setback requirements arebeing complied with;

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c. Vegetation has been removed from allareas that will be covered by the home,accessory structures, or concrete;

d. The site has been properly prepared forthe home installation.

e. All concrete footings and foundationshave been installed in compliance with thisstandard;

f. Site grading and drainage work havebeen completed in compliance with thisstandard; and

g. All aspects of construction which areaffected by roof load specifications havebeen constructed in compliance with thisstandard using the locally specified roofloads.

02. Installation Inspection. An installationinspection shall be performed by both the localauthority having jurisdiction and the licensedinstaller or responsible managing employee(RME). The inspectors should verify that allthe following items, as applicable for thespecific installation, have been obtained,provided, constructed, or installed incompliance with this standard and therequirements of the local authority havingjurisdiction.

a. Applicable permits.

b. Footings.

c. Foundations.

d. Vapor barrier.

e. Footings, particularly with respect tosize and spacing.

f. Piers, particularly with respect to type,size, and spacing.

g. Multi-section connections.

h. Weather stripping and weather sealsinstalled on-site.

i. Exposed structural connections.

j. Tie-down attachments.

k. Skirting or permanent foundation.

l. Underfloor access provisions.

m. Underfloor ventilation provisions.

n. Stairs.

o. Site grading and drainage.

p. Site installed exterior doors.

q. Dryer exhaust ducted through skirtingor foundation.

r. Heat tape and pipe insulation.

s. Duct crossovers, to ensure they havebeen installed in compliance with thisstandard and the duct manufacturer’sinstructions.

t. Flue, chimney, and vents, particularlywith respect to material, size, clearance,connections, and terminations.

u. Factory installed smoke detectors.

v. Wood stoves.

03. Utilities Inspection. A utilities inspectionshall be conducted by State Plumbing andElectrical Inspectors or the local authorityhaving jurisdiction. The inspectors shouldverify that all the following items, as applicablefor the specific installation, have been obtained,provided, constructed, or installed incompliance with this standard and therequirements of the local authority havingjurisdiction.

a. Plumbing connections.

b. Shutoff valves.

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c. Water supply utility connection.

d. Sewer or septic pipe connection.

e. Fuel gas piping.

f. Electrical connections.

g. Electrical service, particularly withrespect to type, size, and workmanship.

h. Air conditioning.

i. After market electrical or plumbingequipment.

205. -- 299. RESERVED.

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301. GENERAL.There are two basic types of installations -standard set and permanent foundation set. SeeFigures 301.1 and 301.2. This Chapterprescribes the general installation requirementswhich apply to both types. Requirements thatspecifically apply to standard set homes areprescribed in Chapter 4. Requirements thatspecifically apply to homes set on permanentfoundations are prescribed in Chapter 5. Tofacilitate the use of this standard, detailedsupport requirements which are applicable toboth types of installations are prescribed inboth sections. All design calculations uponwhich the requirements in Chapters 3, 4, and 5are based, have been reviewed by an IdahoRegistered Professional Engineer forcompliance with the Idaho adopted 2000International Building Code (IBC) (effectiveJanuary 1, 2003).

01. Content: This Chapter prescribesrequirements for:

a. The siting, and design of manufacturedhomes;b. Joining the sections of multi-sectionhomes;c. Flood resistance; andd. Access and egress.

The requirements for installation and tie downanchoring are prescribed in Chapters 4 and 5.

02. Installation Standard. The siting andinstallation requirements contained in thisstandard are based on a roof live load of thirtyto one hundred twenty pounds per square foot(30 to 120 psf), a roof dead load of ten toeighteen pounds per square foot (10 to 18 psf),and a soil bearing capacity of one thousand fivehundred pounds per square foot (1,500 psf).

All manufactured homes shall be installed to theminimum requirements of this standard.

a. Manufacturers' installation instructionsmay be used where specifically permittedin Subsections 301.04, 304.03.b,403.03.b and 503.03.b.b. Manufactured homes placedtemporarily on display, or are in storageand not occupied or intended to beoccupied, shall be temporarily placedaccording to the requirements ofSubsection 301.14.

03. Roof Snow Loads. New manufacturedhomes sold in Idaho are required by HUD to beconstructed to withstand a minimum of thirtypounds per square foot (30 psf) roof snowload. Some jurisdictions may require a higherroof snow load. The dealer shall verify thatroof snow load requirements are beingcomplied with before selling a home in ajurisdiction. Jurisdictions with a higher roofsnow load requirement shall provide the dealer,installer, or customer with written notification,signed by the building official, of the sitespecific roof snow load requirement, prior tothe issuance of an installation permit.04. Unique Installations. Manufacturedhomes with unique installation requirementsnot specifically addressed in this standard shallbe installed according to the manufacturer'sinstallation instructions. However, the use ofthose instructions shall be limited to the specificaspects which are unique. Examples of uniqueinstallation aspects are: hinged rafters,perimeter floor frames, two storied homes,hinged eaves, add-on roofs, marriage linetie-downs, items identified in a HUD andDAPIA approved Alternate Construction (AC)

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MIN. 5 % SLOPEFROM SKIRTING

SKIRTINGENCLOSURE

PERIMETERSUPPORTS

VAPOR BARRIER

TIE DOWN

GROUND ANCHOR

STANDARD SETFIGURE 301.1

6" MIN MIN. 5% SLOPEFROM FOUNDATION

CONCRETEANCHOR

TIE DOWN

VAPOR BARRIER

PERMANENT FOUNDATION SETFIGURE 301.2

PERIMETER SUPPORTINGFOUNDATION OF POUREDCONCRETE OR PRESSURETREATED WOOD ORCONCRETE BLOCK

Letter, and those items specifically identified ina Division interpretation.05. Manufacturer's InstallationInstructions. If the manufacturer's installationinstructions have been used for any portion ofthe installation, as permitted by Subsection 301.04, a copy of those instructions shall beprovided to the inspecting jurisdiction.06. Unusual Installations. A person isallowed to design for unusual installations notprovided for in this standard or in themanufacturer's installation instructions.However, prior written approval must begranted by the authority having jurisdiction.The jurisdiction may require an approveddesign by an Idaho Licensed Professionalengineer.07. Basic Requirement. Regardless of thetype of installation system provided, it shallassure that the manufactured home hasadequate support, a substantially level floor,and a flush floor connection at the marriagelines of multi-section manufactured homes.08. Chassis Removal. Except for wheels,tires, axles, hitches, and transportation lights,no portion of a manufactured home chassisshall be removed before or after themanufactured home is installed. The chassis canbe altered only according to the manufacturer'swritten instructions.09. Underfloor Ventilation. Underfloor areasof all manufactured homes shall be enclosedand ventilated according to Sections 702 and703 of this standard.10. Separation From Ground. Afterinstallation and final grading of the site, thebottom edge of the exterior wall of themanufactured home must be at least six inches(6") above ground level and at least two inches(2") above any other surface where water mightcollect. The main frames shall be a minimum of

twelve inches (12") from the top of the piersupport pad.11. Close Up. Multi-section manufacturedhomes shall be sealed at the marriage lines toresist the elements. Wall and roof close up shallbe made with similar materials and installedaccording to the material manufacturer'sinstallation instructions. Shipping fasteners shallbe removed from the roof and the roof sealed.12. Compliance. A manufactured home shallnot be installed in a manner which takes themanufactured home out of compliance withstate or federal manufactured homeconstruction and safety standards.13. Approval. Installations shall not beapproved until all applicable provisions of thisstandard have been met, including but notlimited to, site preparation, support system,structural connections, tie-down requirements,access and egress requirements, underfloorenclosures with ventilation and access, and allutility connections and crossovers.14. Temporary Placement. When amanufactured home is placed temporarily instorage by a manufacturer, dealer, ordistributor in excess of thirty (30) days, theowner shall assure the manufactured home isadequately supported at each corner and undereach main frame beam by a minimum of foursupports located within two feet (2') from eachend and within eight feet (8') of the front andrear axle. The home shall be sealed to resistexposing the interior of the manufactured hometo the elements of weather. When the home isto be set up in excess of 30 days for display,the owner shall assure the home is adequatelysupported by a minimum of main framesupports located within two feet (2') of eachend and spaced a maximum of eight feet (8') oncenter. The perimeter shall be blocked at alldoors and windows over forty-eight inches(48") wide, and at each corner. The marriage

IMHIS Chapter 3 - General Installation Standards2004 Edition

9

line shall be supported at each ridge beamcolumn, and sealed against the weather.

302. SITE PREPARATION.

01. Suitability of Site. Each site shall besuitable for its intended use and acceptable tothe authority having jurisdiction based on thisstandard and local land use regulations. Noperson shall install a manufactured home on asite which is not in compliance with thisChapter.02. Unforeseen Factors. When unforeseenfactors are encountered (e.g., rock formation,high ground water levels, springs), correctivework shall be completed prior to installing themanufactured home.03. Grading. Site grading and drainage shallprovide:

a. Diversion of any surface water awayfrom the manufactured home andaccessory structures.b. Sufficient site drainage to preventstanding water and soil saturation frombecoming detrimental to structures and useof the site.c. Finished grade away from the home'sfoundation or skirting at a minimum slopeof five percent (5%) horizontally. SeeFigures 301.1 and 301.2.d. Uncovered slabs, patios, or walks shallslope away from the home and structuresin order to drain water away from thehome and structures.

04. Erosion. Where erosion due to high runoffvelocity threatens the manufactured home site,adequate grading, landscaping, or drainagesystems shall be provided to protect the sitefrom degradation.05. Site. Manufactured home sites shall benatural undisturbed soils or controlled fills andshall be free of grass and other organic

material. All fill shall be engineered,compacted, and tested.06. Vapor Retarder. The ground within theenclosed crawl space beneath everymanufactured home shall be covered with a sixone-thousandths inch (.006") thick continuousblack membrane sheeting vapor retarderinstalled according to the followingrequirements.

a. Membrane sheeting seams shall beoverlapped by at least eight inches (8").b. Edges of the membrane sheeting shallnot extend beyond the perimeter of themanufactured home.c. All holes, tears, and penetrations in themembrane sheeting shall be adequatelysealed or patched with durable tape.d. Underfloor membrane sheeting shallnot be in contact with wood unless thewood is pressure treated lumber.e. Black polyethylene membrane sheetingshall be installed over the ground. Clearsheeting may be installed under gravel orconcrete.f. When the manufactured home has arecessed entry, porch, or deck, and thefloor in the recessed area is constructed ofopen decking, the membrane sheeting shallnot be installed below the open deckingfloor.

303. APPROVED INSTALLATIONMATERIALS AND COMPONENTS

01. Component and MaterialsSpecifications. All installation componentsshall be designed for their intended use andshall comply with the following:

a. Concrete Products. All precastconcrete pads, blocks, caps, and shimsshall be equivalent to, or exceed, ASTMC-90-96 and constructed to be lightweight


10

with a blend of aggregates that conform toASTM C-33 and ASTM C-331. Pumiceand cinder block components shall not beused.b. Poured Concrete. All poured in placeconcrete shall cure at least four days priorto the installation of the manufacturedhome and shall have a compressivestrength of not less than two thousand fivehundred pounds per square inch (2,500psi) in twenty-eight (28) days.c. Wood Products. All pressure treatedwood shall be treated with preservativeaccording to AWPA C22 and shall beidentified as to conformance with suchstandard by an approved agency. Fieldtreatment of cut ends of pressure treatedwood is not allowed by this standard.d. Wood-Polymer Composite Products.All wood-polymer composites shallcomply with ASTM 790, ASTM 1037,ASTM D-1413, and AWPA E172.

02. Testing. All components of the supportsystem shall be tested to their dead load plussuperimposed live load equal to three times therequired live load using the test procedures in24 CFR 3280.401.

304. MARRIAGE LINE CONNECTIONS.

01. General. After all shipping and close-upmaterial is removed, all sections ofmulti-section manufactured homes shall besecured to immobilize each section, allow forthe transfer of required loads, and protectinterior and enclosed spaces.02. Shimming. Gaps from one-half inch (1/2")to one inch (1") between manufactured homesections shall be shimmed and sealed accordingto Subsection 304.07. Gaps greater than oneinch (1") shall be corrected by themanufacturer. In no case shall the installerattempt to close gaps by tensioning the lag

bolts while joining the sections together. Thisprocedure will destroy the truss and floorintegrity.03. Ridge Beam Connections. Ridge beamsof multi-section manufactured homes shall besecured together either:

a. With three-eighths inch (3/8") diameterlag bolts with full penetration, withwashers, and spaced equally along thelength of the ridge beam at a maximum oftwenty-four inches (24") on center and nomore than forty-five (45) degrees fromperpendicular. Lag bolts will be installedon both sides of the beam, offsetapproximately one-half of the spacing fromeach other. See Figure 304.1. All ridgebeam lag bolts shall be installed in an areawhere there is solid ridge beam materialbetween the manufactured home sections.Ridge beams shall be predrilled for lagbolts; orb. With a connection system other thanlag bolts which may be engineered by themanufacturer who shall supply the dealerand installer with complete installationinstructions. Those instructions shall be inthe manufactured home and the ridgebeams shall be tagged to indicate analternate system is required.

04. Floor Connections. Floors ofmulti-section manufactured homes shall besecured together. See Figures 304.2 and304.3.

a. With three-eighths inch (3/8") diameterlag bolts with washers installed diagonallyat forty-five (45) degrees or less througheach section's rim joists installed in pairs orstaggered, but not exceeding a maximumspacing of twenty-four inches (24") oncenter; or


11


12

304.1FIGURE CONNECTIONBOLT BEAM RIDGE

C/L

SILL SEALER

#8 X 4" WOODSCREWS - TOESCREWED @ 16"O.C. STAGGERED

EXTERIOR SIDINGOR EXTERIORSIDINGUNDERLAYMENT

FLOOR SHEATHING

MATING DEVICE

CARRIAGE BOLT WITHWASHER AT EACHMATING DEVICE THELENGTH OF THE FLOOR

RIM JOIST

NOTE:

LAG BOLT SHALL BE INSTALLEDAT 45° MIN ANGLE

PROVIDE 1/4" PILOT HOLESFOR LAG BOLT INSTALLATION

LAG BOLTS SHALL HAVEFULL PENETRATION TOOPPOSITE SURFACEOF DOUBLE BEAM

3/8" LAG BOLTS WITH WASHERSAT 24" O.C. FULL LENGTH, BOTHSIDES - STAGGERED WITH FULLPENETRATION

TRUSS TOP CHORDRIDGE CAP

FLOOR SHEATHING

SILL SEALER

#8 X 4" WOOD SCREWS@ 16" O.C. FASTENINGAT EITHER LOCATION ISACCEPTABLE. IF POSTSARE FROM 2X4'S OR2X6'S USE TOE-SCREWMETHOD

MATING LINE

END WALL CONNECTIONSFIGURE 304.5

INTERIOR WALL CONNECTIONSFIGURE 304.4

FLOOR CONNECTION W/ LAG SCREWFIGURE 304.2

FLOOR CONNECTION W/ CLIPSFIGURE 304.3

NOTE:

1.

2.

BOTTOM BOARDNOT SHOWNFOR CLARITYHOLES IN BOTTOMBOARD CREATED BYLAG SCREWS MUSTBE PATCHED WITHA VINYL TAPEDESIGNED FORREPAIRING TEARSAND HOLES

3/8" X 6"MIN. LAGSCREWSMAXSPACING24" O/C

b. With the manufacturer's installedmating devices bolted together withappropriately sized bolts and washers.

05. End Wall and Interior WallConnections. All end wall studs and interiorwall column supports shall be screwed togetherwith four inch (4") long Number Eight (#8)screws spaced sixteen inches (16") on center.See Figures 304.4 and 304.5.06. Lag bolts. Whenever lag bolts are usedone-quarter inch (1/4") pilot holes shall first bedrilled. The bolts shall be installed so as toprovide full penetration of the lag bolt into bothbeams or joists.07. Sealing. During installation, jointsbetween all sections shall be cleaned. Wherethe gap exceeds one-half inch (1/2") top orbottom it shall be filled with a shim. The jointsshall then sealed with a weather strippinggasket material to limit heat loss and preventair, moisture and other damaging infiltration.The gasket material shall be durable,non-porous caulking, closed cell foam,urethane, or sill seal. If the manufacturersupplies a sealer, it shall be used by theinstaller. Caulking, when used, shall fill the gapand be capable of compressing and stretching.Sill seal, if used, shall be a minimum of five andone-half inches (5-1/2") wide and attached withfasteners staggered at six inches (6") on centerand compressed to form a tight seal. Anyremaining gaps shall be caulked or foamed tocomplete the seal.08. Patching. All cuts, holes, or tears in thebottom board or floor insulation including, butnot limited, to areas around structuralconnections and electrical, plumbing,mechanical, and heating equipment penetrationsshall be adequately repaired to prevent theentrance of rodents and to limit heat loss.Repairs shall be made with materials andadhesives designed for this use.

305. FLOOD RESISTANCE.

01. Location. Manufactured homes shall notbe installed in designated flood ways but maybe installed in flood hazard areas according tothe minimum requirements of this section.02. Installation. All manufactured homesinstalled in designated 100 year flood hazardareas shall be installed according to FEMAguidelines or be placed on permanent perimeterfoundations to resist flotation, collapse, orlateral movement during a base flood. Homesinstalled in Manufactured/Mobile home parksshall be allowed to be installed and anchored inaccordance with FEMA guidelines.03. Elevation. The underside of the floor of allmanufactured homes installed in designated 100year flood hazard areas shall be a minimum oftwelve inches (12") above the flood elevationto resist flotation, collapse, or lateral movement04. Underfloor Enclosures. Notwithstandingthe requirements of Section 703, manufacturedhomes installed in designated flood hazardareas shall have the underfloor enclosurefoundation vents located within twelve inches(12") vertically of the finished grade.

NOTE: The following information onFEMA is not adopted as part of thisstandard but referenced in this standard forthe convenience of the user.Federal Emergency Management Agency(FEMA). In addition to the state'sminimum standards for elevatingmanufactured homes in flood hazard areas,44 CFR, Chapter 1, Section 60.3(c) (6)(iv) of the Federal EmergencyManagement Agency (FEMA) regulations,requires all manufactured homes indesignated flood areas to be elevated toresist flotation, collapse, and lateralmovement during the base flood. Foradditional up-to-date information of


13

FEMA requirements, programs, orinsurance contact:a. State Coordinator

Dept. Of Water Resources1301 N. OrchardBoise, Idaho 83706

b. Federal Emergency Mgmt. AgencyFederal Regional Center130-228th St. SWBothell, Washington 98021-9796

306. EGRESS REQUIREMENTS.

01. Egress. Upon completion of installation,and prior to occupancy, each manufacturedhome shall conform with the followingrequirements:

a. Each egress door on a manufacturedhome shall be accessible by stairs, a ramp,or a deck.b. Windows and doors shall be adjusted,secured in place, and made operational toprovide security, egress, and to minimizeair leakage and water penetration.c. Damage to windows and doors whichaffect their safety features, thermalperformance, or operation shall be repairedor replaced.d. Each manufactured home shall have anunderfloor access provided andconstructed according to Section 704.

02. Inspection Approval. Installations shallnot be approved until a means of access has


14

USE REDWOOD OR PRESSURETREATED WOOD WITHIN 6"OF GRADE

NOTE:PROVIDE SECURE ATTACHMENT TOBUILDING TO PREVENT HORIZONTALMOVEMENT

INSTALL APPROVED 128 SQ INFOOTINGS AS REQUIRED

STAIRSFIGURE 306.1

30" MAX W/O GUARD RAILSGUARD RAILS REQ'D OVER 30"

3'-0"

7 3/4" MAX RISER (TYP)

10" MIN TREAD

been provided to each of the two required exitdoors on the manufactured home.03. Stairs. Prior to occupancy, stairs whichmeet or exceed the following standard, shall beprovided at each egress door. See Figure306.1 Minimum standards are prescribed in thefollowing Subsections.

a. Stairs shall be constructed with aminimum thirty-six inch (36") width, sevenand three-quarters inch (7¾") maximumtread rise, minimum ten inch (10") treadrun, and a minimum thirty-six inch bythirty-six inch (36" x 36") top landinglocated not more than seven andthree-quarters inch (7¾") below the floorof the home. All stairways with four ormore risers shall be equipped with aguardrail on at least one side with the toplocated between thirty-four inches (34")and thirty-eight inches (38") abovelandings and the nosing of treads. Anystairway with a landing greater than thirtyinches (30") above grade must have guardrails constructed in accordance withSection 710.b. Stairs shall be constructed and crossbraced with Number 2 (#2) or better gradelumber. All lumber within six inches (6") ofgrade shall be redwood or pressuretreated.c. Stairs shall be supported on a minimumof four (4) one hundred twenty-eight (128)square inch footings as described inSubsection 402.01 of this standard. Thetwo (2) footings closest to the home maybe eliminated if the step is securelyattached to the home.

04. Permanent Construction Requirements.All permanent ramps, steps, stairways, railings,decks, porches, and landings shall beconstructed and installed according to Section910.

307. -- 399. RESERVED.


15


16

401. GENERAL.

This Chapter prescribes the installationrequirements that specifically apply to standardset homes. See Figure 301.1.

01. Content: This series of sectionsprescribes requirements for:

a. The support pier system for standardset manufactured homes; andb. Tie down anchoring;

02. Frost Line. Manufactured homes on astandard set are not required to have supportfootings below the frost line. However,perimeter blocking must be installed in amanner, and skirting or other approved fasciamaterial must be installed, to minimize theeffects of frost.

402. APPROVED INSTALLATIONMATERIALS AND COMPONENTS.

01. Footings. Pier support footings shall be aminimum of two hundred fifty-six (256) squareinches and not less than the width of the pierbeing supported. Ridge beam column supportfootings shall be sized according to Subsection403.03.b. Footings shall be any one of thefollowing, except where specifically statedotherwise.

a. Precast Pads. One (1) or more precastconcrete pads with a nominal size ofsixteen inches by sixteen inches (16" x 16")by four inches (4") thick or two (2) ormore pads with a nominal size of eightinches by sixteen inches (8" x 16") by fourinches (4") thick. Eight inch by sixteeninch (8" x 16") pads may be used only withconcrete block piers. The pier blocks shall

be perpendicular to the joint of the pad.See Figure 402.1.b. Poured Concrete Pads. Nominal fourinch (4") or thicker poured-in-placeindividual concrete pads, either square orround. See Figure 402.2.c. Lumber or Polymer Stacked Pads.Pads of two (2) to four (4) layers of twoinch (2") nominal size thick foundationgrade lumber, pressure treated on all sixsides, or pads of two to four layers of twoinch (2") nominal size thick polymercomposite. Each layer shall be laidperpendicular to the layer below it. SeeFigure 402.3.d. Lumber Pads. Pads of one layer oftwo inch (2") nominal size thickfoundation grade lumber pressure treatedon all six sides. If used with concrete piers,the grain shall be parallel with the long sideof the block with no more than one inch(1") of wood exposed beyond the longsides of the block. See Figure 402.4.e. Plywood Pads. Pads of one (1) pieceof one and one-quarter inch (1-1/4") thickplywood pressure treated on all six sides orpads of two stacked pieces ofthree-quarter inch (3/4") thick plywoodpressure treated on all six sides. SeeFigure 402.5.f. Runners. Continuous concrete runnerswith a thickness of six inches (6") and notless than eighteen inches (18") wide[twenty inches (20”) wide under themarriage line] with two (2) continuousthree-eighths inch diameter (#3)reinforcing bars. The reinforcing bars shallbe centered vertically in the runner, teninches (10") apart and shall not be closer

Chapter 4STANDARD SET INSTALLATION STANDARDS

17

Chapter 4 - Standard Set Installation Standards IMHIS2004 Edition

18

PLACE BLOCK PERPENDICULARTO JOINT ON (2) 4 X 16 PADS

3 5/8" MIN

MIN 256 SQ. INCH CONCRETEBLOCK FOOTING [(2) 8" X 16" X 4" (NOMINAL)OR (1) 16" X 16" X 4" ATSM C-90-96

27 5/8"

8"

TYPICAL 2" X 10" X 28"(NOMINAL 1-1/2" X 9-1/4" X 27-5/8")MINIMUM 256 SQUARE INCH SINGLELAYER WOOD FOOTING PRESSURETREATED ON ALL SIX SIDES

16" 16"

3 1/2" MIN

16"16"

1-1/4" MIN

MINIMUM 256 SQUARE INCH PLYWOOD FOOTINGPRESSURE TREATED ON ALL SIX SIDESNOTE: FIELD TREATMENT OF CUT EDGESIS NOT ACCEPTABLE

OPT. USE (2) LAYERSEQUAL TO 1-1/2" MIN

16" MIN

1 1/2"MIN

1 1/2"MIN

16" MIN

MIN 256 SQUARE INCH TWO LAYER WOODFOOTING WITH LAYERS PERPENDICULAR TOEACH OTHER AND PRESSURE TREATED ONALL SIX SIDES OR MAY BE SUBSTITUTEDWITH WOOD-POLYMER COMPOSITE

2" MINIMUM

3" MIN 3" MIN

18" MIN

5 1/2"MINIMUM

CONTINUOUS POURED IN PLACEFOOTING WITH MINIMUM 2500 PSIIN 28 DAYS

MINIMUM 256 SQUAREINCH POURED IN PLACECONCRETE FOOTING

2" MINIMUM ABOVE GRADE

3" MIN

TYPICAL PIER BLOCK

1" MAX

REBAR

ABOVE GRADE

20" MIN. @ M.L.

10" MIN

TYPICAL PIER BLOCK

CONTINUOUS CONCRETE FOOTINGFIGURE 402.6

WOOD PIER PADFIGURE 402.5

POURED CONCRETE PIER PADFIGURE 402.2

DOUBLE LAYER WOOD PIER PADFIGURE 402.3

SINGLE LAYER WOOD PIER PADFIGURE 402.4

PRECAST CONCRETE PIER PADFIGURE 402.1

than three inches (3") from the edge. Therunner shall be centered beneath themainframe. See Figure 402.6. Theserunners may be poured wide enough toinclude the outer mainframe and perimetersupports, or the inner mainframes andmarriage line supports, on the same runner.If runners are poured wide enough toinclude two or more rows of supports two(2) continuous three-eighths inch diameter(#3) reinforcing bars shall be used for eachrow of supports. The reinforcing bars shallbe centered vertically in the runner, spacedequidistant apart, and shall not be closerthan three inches (3") nor farther than sixinches (6”) from the edge.g. Other. Listed prefabricated pads orother equivalent materials approved by theDivision and the Manufactured HomeInstallation Committee.

02. Block Piers. Concrete block piers shall beplaced on approved minimum two hundredfifty-six (256) square inch (or sized as requiredfor ridge beam column supports) footings andshall not exceed the size of the footing. Blockpiers shall be capped and shimmed withapproved components. Piers shall be:

a. Concrete block. The blocks shall beeither open or closed cell precastlightweight concrete of nominal size ofeight inches by eight inches by sixteeninches (8" x 8" x 16"). Open cell blocksshall be positioned vertically. SeeFigure 402.7. Cinder or pumice blocksshall not be used.

(1) Single Stack. Block piers up tothirty-six inches (36") high under themain frame or marriage line andforty-eight inches (48") high under theperimeter walls may be single stacked.Single stacked block piers shall beplaced perpendicular to the main frameand marriage line and parallel at the

perimeter wall. Single stack piers shallbe placed perpendicular to the joint oftwo (2) eight inch by sixteen inch (8" x16") nominal size concrete pads. SeeFigure 402.1.

(2) Double Stack. Block piers overthirty-six inches (36") high under themain frame and marriage line, and overforty-eight inches (48”) high under theperimeter walls, shall be double stackedwith blocks interlocking. See Figure402.8.

(3) Maximum Height. No concreteblock piers shall be constructed overeighty inches (80") in height unlessdesigned by an Idaho LicensedProfessional engineer.

(4) Capacity. Single stack block piersshall be used for loads not to exceedfive thousand (5,000) pounds. Doublestack block piers shall be used for loadsnot to exceed sixteen thousand (16,000)pounds. Double and single piers may becombined for higher loads.

03. Block Pier Caps. Each block pier shall becapped with a pier cap equal in area to the pierblocking (i.e., 8" x 16" or 16" x 16"). SeeFigures 402.7, 402.8, and 402.9. Pier capsshall be one or more of the following.

a. Precast Block. A solid concrete blockwith a nominal thickness of four inches(4").b. Plywood. One (1) piece of one andone-quarter inch (1-1/4") thick plywood,or two (2) pieces of three-quarter inch(3/4") thick plywood.c. Lumber. One (1) two inch (2")nominally thick Number 2 (#2) or bettergrade lumber.

IMHIS Chapter 4 - Standard Set Installation Standards2004 Edition

19


20

SINGLE 4" X 16" X 16" PRECASTCONCRETE FOOTINGS OR OTHERAPPROVED FOOTINGS MATERIAL(TYPICAL)

TYPICAL 256 SQUARE INCHPRECAST CONCRETE FOOTING

8" X 8" X 16"PRECAST DOUBLEINTERLOCKEDPIER BLOCKS

4" X 16" X 16"PRECASTCONCRETEPIER CAPSHOWN

1" X 4" X 8"WOOD WEDGESSHOWN-ALTERNATEDIRECTION

TYPICAL MAINFRAME

2" X 6" X 16"WOOD SHIMSSHOWN4" X 16" X 16"PRECASTCONCRETE PIERCAP SHOWNPIER BLOCK(TYPICAL8" X 8"" X 16"PRECASTCONCRETE PIERBLOCKS SHOWN)4" X 16" X 16"PRECASTCONCRETEFOOTING SHOWN

12" MIN36" MAX

8" X 8" X 16"OPEN CELL

TYPICAL BLOCK PIER DETAILFIGURE 402.9

TYPICAL CONCRETE BLOCK PIERFIGURE 402.7

TYPICAL DOUBLESTACK

CONCRETE BLOCK PIERFIGURE 402.8

TYPICAL PREFABRICATED PIERFIGURE 402.10

TYPICAL MAINFRAME

TYPICALCONCRETEFOOTINGSHOWN

(SEE PIERINSTRUCTIONS)

OVER-EXTENDEDSHALL NOT BE

ADJUSTABLESCREW

1" X 4" X 8"WOOD WEDGES

SHOWN- ALTERNATE

DIRECTION

TYPICALPREFABRICATED PIER

- TESTED, LISTED,AND LABELED

(MINIMUM 4000 LBSCAPACITY)

d. Polymer. One (1) two inch (2")nominally thick wood polymer composite.e. Other. Listed or equivalent materialsapproved by the Division and theManufactured Home InstallationCommittee.

04. Block Pier Shims. Where shim material isused between the top of the pier cap and thebottom of the main frame, the shimmingmaterial shall not exceed five inches (5")vertically. See Figure 402.9. Pier shims, whenused, shall be one or more of the following;

a. Precast Concrete. Two inch (2") thicksolid concrete blocks equal in area to thepier cap;b. Plywood. Three-quarter inch (3/4") orthicker plywood equal in area to the piercap;c. Lumber. Two inch (2") nominallythick Number Two (#2) or better gradelumber not less than five and one-halfinches (5-1/2") in width and sixteen inches(16") long;d. Polymer. One and one-quarter inch(1-1/4") minimum thickness wood polymernot less than five and one-half inches(5-1/2") in width and sixteen inches (16")long; ore. Other. Listed or equivalent materialsapproved by the Division and theManufactured Home InstallationCommittee.

05. Block Pier Wedges. No more than twosets of wedges three-quarter inch (3/4") thickor one set of wedges one and one-half inches(1-1/2") thick by three and one-half inches(3-1/2") wide by eight inches (8") to sixteeninches (16") long may be used. They must befitted perpendicular with, and driven tight to,the bottom of the main frame or floor to

transfer loads uniformly to the pier. SeeFigures 402.8 and 402.9.06. Prefabricated Piers. Prefabricated piersshall be placed on approved footings and shallnot exceed the size of the footing. See Figure402.10. Piers shall be:

a. Tested and Listed. All prefabricatedpiers shall be tested, listed, and labeled fora capacity of not less than four thousand(4,000) pounds. See Subsection 303.02.b. Instructions. The installation of thepiers shall be in compliance with piermanufacturers' instructions which shall beleft with the home.c. Shims. No shims shall be used with aprefabricated pier.d. Adjustable Heads. All piers shall beof the type fitted with an adjustable headand nut. The adjustment shall not exceedthat permitted by the manufacturer'sinstructions.

07. Other piers. Other piers may be used onlyby approval of the Division of Building Safetyand the Manufactured Home InstallationCommittee.

403. INSTALLATION SUPPORTREQUIREMENTS.

01. Main Frame Supports. The main frameof all standard set manufactured homeinstallations shall be supported as prescribed inthe following Subsections. See Figure 403.1.All materials and components shall comply withthe requirements of Section 402.

a. Footings for Standard Sets. Thefootings for the support piers under themain frames of a standard setmanufactured home shall be any of thefootings in Subsection 402.01. Theminimum size shall be two hundredfifty-six (256) square inches.


21

c. Piers. The piers for the support ofmain frames in standard sets shall be any ofthe piers in Subsections 402.02, 402.06,or 402.07. When block piers are used theyshall be placed perpendicular to the mainframe.d. Location of Supports. The footingsand pier stands under the main frame shallbe placed not more than twelve inches(12") from the ends of the frames. Thefootings and pier stands shall continue tobe set six feet (6') on center the full lengthof the frame. A six inch (6") variance is

allowable to clear obstructions. Thisspacing shall be maintained in all roofloads up to and including one hundredtwenty pounds per square foot (120 psf).

02. Perimeter Supports. The perimeter sidewalls of all manufactured homes over elevenfeet (11') in width shall be supported asprescribed in the following Subsections. SeeFigure 403.1. All materials and componentsshall comply with the requirements of Section402.


22

RIDGE BEAM COLUMN SUPPORTS

PERIMETER SUPPORTS

MARRIAGE LINE RIMJOIST SUPPORTS

MAIN FRAME SUPPORTS

PERIMETER

STANDARD SET SUPPORT SYSTEMFIGURE 403.1

MAIN FRAMESUPPORTS

RIDGE BEAMSUPPORTS

MARRIAGE LINERIM JOISTSUPPORTS

LOCATED WITHIN 12 INCHES OF EACH END AND 6 FT O.C. FOR ALL ROOF LOADS

LOCATED WITHIN 6 INCHES OF EACH ENDAND AS REQUIRED AND MARKED BY THE MANUFACTURER

LOCATED 8 FT O.C. FOR ALL ROOF LOADS 30 PSF AND GREATEREXCEPT WHEREVER THERE IS A WALL ABOVE THE MARRIAGE LINETHEN SUPPORTS SHALL BE LOCATED 6 FT O.C. FOR 40 PSF; 4 FT O.C.FOR 60 PSF ; 3 FT O.C. FOR 80 PSF; 2 FT O.C. FOR 100 PSF OR OVER.

LOCATED WITHIN 6 INCHES OF CORNER AND 8 FT O.C.FOR ROOF LOAD UP TO 30 PSF; 6 FT O.C. FOR 40 PSF; 4 FT O.C. FOR 80 PSF; FOUNDATIONS FOR 100 PSF AND OVER

PERIMETERSUPPORTS

c. Piers. The piers for the support ofmain frames in standard sets shall be any ofthe piers in Subsections 402.02, 402.06,or 402.07. When block piers are used theyshall be placed perpendicular to the mainframe.d. Location of Supports. The footingsand pier stands under the main frame shallbe placed not more than twelve inches(12") from the ends of the frames. Thefootings and pier stands shall continue tobe set six feet (6') on center the full lengthof the frame. A six inch (6") variance isallowable to clear obstructions. Thisspacing shall be maintained in all roofloads up to and including one hundredtwenty pounds per square foot (120 psf).

02. Perimeter Supports. The perimeter sidewalls of all manufactured homes over elevenfeet (11') in width shall be supported asprescribed in the following Subsections. SeeFigure 403.1. All materials and componentsshall comply with the requirements of Section402.

a. Perimeter Footings for StandardSets. The footings for the support piersunder the perimeter side walls of astandard set manufactured home shall beany of the footings in Subsection 402.01.The minimum footing size shall be twohundred fifty-six (256) square inches.Footings shall not extend beyond theexterior perimeter walls of themanufactured home.b. Perimeter Piers for Standard Sets.The piers for the support under theperimeter side walls of a standard setmanufactured home shall be any of thepiers in Subsections 402.02, 402.06, or402.07.

(1) All piers must be installed onapproved footings which meet therequirements of Subsection 402.01.

(2) Block piers are required if thefooting is constructed of eight inch bysixteen inch by four inch (8" x 16" x 4")precast pads. The pier blocks must beplaced perpendicular to the joint of thepads. See Figure 402.1.

(3) When it is not possible to install aperimeter pier directly under theexterior sidewall, the floor shall besupported by a four inch (4") wide bysix inch (6") high nominal size or equalhorizontal Number Two (#2) or bettergrade wood beam, spanning a minimumof three floor joists and supported by anapproved pier recessed not more thanten inches (10") from the perimeter. SeeFigures 403.2 and 403.3. When woodwedges are used with the beams, theyshall be installed at each end of theblock pier between the top of the pierand the bottom of the beam. Block piersshall be placed perpendicular to thefloor joists.

(i) Exception: In homes withlongitudinal joists and where the thirdjoist is above or inside the main framebeam, the pier support beam shallspan a minimum of two joists.

(4) Where a manufactured home hascantilevered portions and expandedrooms, these protrusions shall besupported by piers at each corner andalong the cantilevered portion of thesidewall perimeter.

c. Location of Supports. Footings andpier stands under the perimeter side wallsshall be located as prescribed below.

(1) Six inches (6") or less from eachcorner.


23


24

FIGURE 403.5

SUPPORT BEAM SHALL SPAN3 JOISTS MIN. AND SHALL BEOF #2 OR BETTER GRADELUMBER (2) 2" X 6" OR(1) 4" X 6"

4" X 8" X 16" PRECASTCONCRETE PIER CAP8" X 8" X 16" PRECASTCONCRETE PIER BLOCKS

4" X 16" X 16"CONCRETE FOOTING

TYPICAL 4" X 16" X 16"PAD SPANNING PADSBELOW

TYPICAL 4" X 16" X 16"PAD SPANNING PADSBELOW

TYPICAL 4" X 16" X 16"FOOTING PADS

TYPICAL 4" X 16" X 16"FOOTING PADS

TYPICAL SKIRTINGWALL INSTALLEDPER MFR.RECOMMENDATIONS

PRESSURETREATEDPLATE

4" X 16" X 16"CONCRETE FOOTING

8" X 8" X 16" PRECASTCONCRETE PIER BLOCKS

4" X 8" X 16" PRECASTCONCRETE PIER CAP

SUPPORT BEAM SHALL SPAN3 JOISTS MIN. AND SHALL BEOF #2 OR BETTER GRADELUMBER (2) 2" X 6" OR(1) 4" X 6"

PRESSURE TREATED PLATE

TYPICAL SKIRTINGWALL INSTALLEDPER MFR.RECOMMENDATIONS WEDGES FROM 1" X 4" X 8"

ALTERNATE WEDGE DIRECTION

10" MAX

1024 SQ IN PIER PAD(11,000 POUND CAPACITY)

NOTE:WHEN WOOD WEDGES ARE USED WITH WOODSUPPORT BEAMS THEY SHALL BE INSTALLEDAT EACH END BETWEEN THE TOP OF THEPIER SHIM AND THE BOTTOM OF THEHORIZONTAL BEAM

WHEN WOOD WEDGES ARE USED WITH WOODSUPPORT BEAMS THEY SHALL BE INSTALLED

PIER SHIM AND THE BOTTOM OF THEHORIZONTAL BEAM

AT EACH END BETWEEN THE TOP OF THE

NOTE:

512 SQ IN PIER PAD(5000 POUND CAPACITY)

10" MAX

FIGURE 403.4

PERIMETER PIERW/ TRANSVERSE JOISTS

FIGURE 403.2

PERIMETER PIERW/ LONGITUDINAL JOISTS

FIGURE 403.3

(2) Eight feet (8') on center maximumfor roof loads from thirty to fortypounds per square foot (30 to 40 psf).Thirty pounds per square foot is theminimum permissible snow load ratingin Idaho.

(3) Six feet (6') on center maximum forroof loads over forty and up to sixtypounds per square foot (40 to 60 psf).

(4) Four feet (4') on center maximumfor roof loads over sixty and up toeighty pounds per square foot (60 to 80psf).

(5) For all homes with roof loads overeighty pounds per square foot (80 psf)outside of parks a permanentfoundation shall be installed.

(6) A six inch (6”) variance is allowableto clear obstructions.

03. Marriage line Supports. The marriageline rim joists and ridge beam columns of allstandard set multi-section manufactured homesshall be supported as prescribed in thefollowing Subsections. See Figure 403.1. Allmaterials and components shall comply with therequirements of Section 402.

a. Marriage Line Rim Joist Supports.The entire marriage line shall be supportedby minimum two hundred fifty-six (256)square inch footings and piers. SeeSubsections 402.01, 402.02, 402.06, or402.07. b. Ridge Beam Column Supports.Marriage line roof ridge beam columnsupports shall comply with therequirements prescribed in the followingsubsections.

(1) The manufacturer shall identify in adiagram the load on, and the locationof, each column. The diagram shall beprovided to the homeowner, and upon

request, to the dealer, installer, andlocal authority having jurisdiction.

(2) The manufacturer shall clearlymark the location of each column.These markings shall remain visible forinspection after the installation iscompleted.

(3) The installer shall use themanufacturer's diagram and markings todetermine locations and loads ofcolumn supports.

(4) The installer shall use Table 400-Ato determine the size of footingrequired for each column load.

(5) Footings for marriage line roofridge beam support columns shall beconstructed according to any one of thefollowing four methods.

(a) Multilayered sixteen inch bysixteen inch by four inch (16" x 16" x4") precast concrete pads placed in apyramid shape to distribute the loadfrom the pier to the base. See Figures 403.4 and 403.5. Each layerof blocks shall span at least fiftypercent (50%) of each block in thelayer beneath.

(b) Poured in place concrete pads aminimum of eight inches (8") nominalthickness with two (2) three-eighthsinch diameter (#3) reinforcing bars ineach direction.

(c) A poured concrete footingrunner a minimum of eight inches (8")nominal thickness by twenty inches(20") wide with two properlypositioned three-eighths inch (#3)reinforcing bars. See Subsection402.01.f.


25

(d) Pads of two to four layers ofminimum two inch by ten inch (2" x10") nominal size lumber pressuretreated on all six sides. The length ofthe pad shall not exceed double thewidth. The boards in each layer shallbe laid crosswise to the boards in thelayer beneath.

d. Piers. Marriage line piers shall beconcrete block or listed prefabricatedpiers. See Subsections 402.02 and 402.06.All ridge beam columns with a load inexcess of five thousand pounds (5,000 lbs.

shall have multiple blocked concrete piersor prefabricated piers listed and labeled tosupport the load either by itself or incombination with another pier.e. Location of Supports. Marriage linesupports shall be located as prescribedbelow. See Figure 403.1.

(1) On a standard set the first supportwill be the first ridge beam columnsupport, which shall be within six inches(6") of each end.


26

The footing sizes shown are for square pads and are based on the area (square inches) requiredfor the load. Other footing configurations, such as a rectangular configuration, may be used,provided the area (square inches) is equal to or greater than the area of the square footingshown in the table. For example, a 12-inch x 22-inch (264-square-inch) footing may be used inplace of a 16-inch x 16-inch (256-square-inch) footing. Also, two 12-inch x 24-inch pads may be used in place of one 24-inch x 24-inch pad.

19,00043 x 438,00028 x 28

18,00042 x 427,50027 x 27

17,00040 x 407,00026 x 26

16,00039 x 396,50025 x 25

15,00038 x 386,00024 x 24

14,00037 x 375,50023 x 23

13,00035 x 35 5,00022 x 22

12,00034 x 344,50021 x 21

11,00032 x 324,00020 x 20

10,00031 x 313,50018 x 18

9,00030 x 303,00017 x 17

8,50029 x 292,50015 x 15

Capacity(Pounds)

Footing Size(Inches)

Capacity(Pounds)


Table 400-A

(2) Ridge beam column supports shallbe sized and located per the diagramssupplied by the manufacturer for eachhome and Table 400-A.

(3) Marriage line rim joist supportsshall be located along the entire lengthof the marriage line as prescribedbelow.

(a) Eight feet (8') on centermaximum for all roof loads thirtypounds per square foot (30 psf) andgreater. Thirty pounds per squarefoot is the minimum permissible snowload rating in Idaho for newmanufactured homes.

(b) Six feet (6') on center maximumfor roof loads over forty and up tosixty pounds per square foot (40 to60 psf) wherever there is a wall abovethe marriage line.

(c) Four feet (4') on centermaximum for roof loads over sixtyand up to eighty pounds per squarefoot (60 to 80 psf) wherever there isa wall above the marriage line.

(d) Three feet (3') on centermaximum for roof loads over eightyand up to one hundred pounds persquare foot (80 to 100 psf) whereverthere is a wall above the marriageline.

(e) Two feet (2') on centermaximum for roof loads over onehundred pounds per square foot (100psf) wherever there is a wall abovethe marriage line.

(f) As an alternate support system tothat specified in (d) and (e) above, amarriage line pony wall may beconstructed of minimum two inch bysix inch (2" x 6") nominal size studs,

twenty-four inches (24") on center,with double top and single (treated)bottom plates to support the marriageline. A four inch by six inch (4" x 6")nominal size post shall be placed inthis pony wall at all ridge beamsupport locations identified by themanufacturer. All wood shall have astructural rating equal to, or greaterthan, #2 SPF.

(g) Ridge beam column supportsmay be considered to be rim joistsupports as long as the maximumallowable spacing between supportsis not exceeded.

04. Height of Installation. No more thantwenty-five percent (25%) of the main framepier supports of a manufactured home shallexceed thirty-six inches (36") in height withoutprior approval of the local authority havingjurisdiction. Pier heights shall be measuredfrom the top of the footing to the bottom of theframe. See Figure 402.9. Maximum pier heightshall not exceed eighty inches (80"). SeeFigure 402.8.

404. ANCHORING.

01. Anchoring. To resist lateral movementfrom high winds, earthquakes, and flooding, allmanufactured homes shall be anchored down.02. Loads. Anchoring equipment including allanchors, straps, and tension devices used tosecure a manufactured home when installed,shall be capable of resisting an allowableworking load at least equal to or exceedingthree thousand one hundred-fifty pounds(3,150 lbs) and shall be capable of withstandingfifty percent (50%) overload (4,725 lbs)without failure of either the anchoringequipment or the attachment point to themanufactured home. When the stabilizingsystem is designed by a qualified IdahoLicensed Engineer, alternate working loads


27

may be used, provided the anchoringequipment is capable of withstanding a fiftypercent (50%) overload. Each type of anchorsuitable for the purpose of this standard shallmeet the following criteria.

a. Each anchor shall be certified andlisted as to its resistance against pullingbased on the maximum angle of diagonalor vertical tie loading and the angle ofanchor installation and the type of soil inwhich the anchor is to be installed.b. Anchors designed for the connection ofmultiple ties shall be certified and listed asbeing capable of resisting the combinedworking load and overload consistent withthe intent expressed herein; and shall beinstalled to resist resultant forces.c. Each anchor shall be selected based onthe soil class at the depth where the anchorwill be installed.

d. Each anchor shall, at a minimum, beinstalled to the full depth shown in theanchor manufacturer's installationinstructions. The retainer or stabilizerplates shall be installed to achieve therequired ground anchor resistancecapacity. See Figure 406.1.e. The load carrying portion of the anchorshall extend below the frost line.

03. Installation Instructions. Anchormanufacturers shall provide manufacturer'sinstallation instructions for all listed andapproved anchoring systems sold in Idaho.Anchor manufacturer's installation instructionsshall be consistent with the product listing andapproval. One copy of the anchormanufacturer's instructions must be madeavailable to the inspectors of the local authorityhaving jurisdiction.

a. Caution: Before installing groundanchors, the site should be checked for


28

CONCRETEFOOTING

MAIN FRAME BEAM

6" MAX INFROM EDGEOF FLOOR

TIE DOWNSTRAP

STRAPBUCKLE

MAIN FRAME

TO ANCHOR

GROUND ANCHOR

FLOOR JOIST

ALTERNATE GROUNDANCHOR LOCATIONWITH STABILIZER PLATE

PRECASTCONCRETEPIER CAP SHOWN

4" X 16" X 16"

ANCHOR STRAP

ALTERNATE STRAPPING SYSTEM MAYBE USED UPON PRIOR APPROVAL BYTHE DIVISION OF BUILDING SAFETY

MAIN FRAME TIE-DOWNSTRAP CONNECTION

FIGURE 406.2FRAME TIE DOWN DETAIL

FIGURE 406.1

PIER

ASTM PER AS FOOT PER OZ. .80 ATAPPLIED COATING ZINC WITH STEEL

WIDE1/4" 1 X .035 BE SHALL STRAPPING NOTE:

03953-87

marked and unmarked undergroundutilities.

04. Testing. Anchoring devices shall be testedto one and one-half (1.5) times the horizontalwind load of fifteen pounds per square foot (15psf) and a roof uplift of nine pounds per squarefoot (9 psf) using the test procedures in thecurrent version of ASTM D-3953.05. Ties. All tie strapping shall be fastened toanchors and drawn tight with adjustabletensioning devices supplied with the anchor.

a. Tie strapping shall be certified andlisted to be capable of resisting anallowable working load of three thousandone hundred-fifty pounds (3,150 lbs) withno more than two percent (2%) elongationand shall withstand a fifty percent (50%)overload.b. Ties shall connect the anchor to themain frame I-beams which run lengthwiseunder the manufactured home. Ties shallnot connect to steel outrigger or crossmember beams which fasten to, andintersect with, the main frame I-beams.c. Tie materials shall be designed toprevent self-disconnection when ties areslack. Open hook ends shall not be used inany part of the anchoring system. SeeFigure 406.2.

06. Spacing. Unless otherwise specified in theanchoring equipment manufacturer's installationinstructions, anchoring devices shall be installedon both sides of the manufactured home with amaximum spacing of eleven feet (11') on centerand no more than two feet (2') from each end.07. Certification. Anchoring equipment iscertified when tested, listed, and labeled by anationally recognized testing and listinglaboratory, or designed by a Idaho LicensedProfessional Engineer and approved by theDivision of Building Safety and theManufactured Home Installation Committee.

08. Alternate anchoring systems. Alternateanchoring systems may be used when approvedby the Division and the Manufactured HomeInstallation Committee.

407. -- 499. RESERVED.


29


30

501. GENERAL.There are two basic types of installations -standard set and permanent foundation set.This Chapter prescribes the installationrequirements for homes installed on permanentfoundations. See Figure 301.2.

01. Content: This series of sections prescribesrequirements for:

a. The foundation and support piersystem for manufactured homes installedon permanent foundations;b. Tie down anchoring;

02. Frost Line. Manufactured homes on apermanent foundation shall have the footingsbelow the frost line. The local authority havingjurisdiction will prescribe the required depth.

502. APPROVED INSTALLATIONMATERIALS AND COMPONENTS.

01. Footings. Pier support footings shall be aminimum of two hundred fifty-six (256) squareinches and not less than the width of the pierbeing supported. Ridge beam column supportfootings shall be sized according to Subsection 503.03.b. Footings shall be either one of thefollowing, except where specifically statedotherwise.

a. Poured Concrete Pads. Nominal eightinch (8") or thicker poured-in-placeindividual concrete pads, either square orround. See Figure 502.1.b. Runners. Continuous concrete runnerswith a thickness of eight inches (8") andnot less than eighteen inches (18") wide[twenty inches (20”) wide under themarriage line] with two (2) continuousthree-eighths inch diameter (#3)

Chapter 5PERMANENT FOUNDATION INSTALLATION STANDARDS

31

18" MIN20" MIN. @ M.L.

10" MIN

16" 16"

8" MIN

MINIMUM 256 SQUAREINCH POURED IN PLACECONCRETE FOOTING

CONTINUOUS CONCRETE FOOTINGFIGURE 502.2

POURED CONCRETE PIER PADFIGURE 502.1

CONTINUOUS POURED IN PLACEFOOTING WITH MINIMUM 2500 PSIIN 28 DAYS

8"MINIMUM

CENTER VERTICALLY

REBAR

3" MINBOTH SIDES

2" MINIMUMABOVEGRADE

2" MINIMUM ABOVE GRADETYPICAL PIER BLOCK

Chapter 5 - Permanent Foundation Installation Standards IMHIS2004 Edition

32

8" X 8" X 16"PRECAST DOUBLEINTERLOCKEDPIER BLOCKS

4" X 16" X 16"PRECASTCONCRETEPIER CAPSHOWN

1" X 4" X 8"WOOD WEDGESSHOWN-ALTERNATEDIRECTION

TYPICAL MAINFRAME

2" X 6" X 16"WOOD SHIMSSHOWN4" X 16" X 16"PRECASTCONCRETE PIERCAP SHOWNPIER BLOCK(TYPICAL8" X 8"" X 16"PRECASTCONCRETE PIERBLOCKS SHOWN)8" X 16" X 16"POUREDCONCRETEFOOTING SHOWN

12" MIN36" MAX

8" X 8" X 16"OPEN CELL

TYPICAL BLOCK PIER DETAILFIGURE 502.5

TYPICAL CONCRETE BLOCK PIERFIGURE 502.3

TYPICAL DOUBLE STACKCONCRETE BLOCK PIER

FIGURE 502.4

TYPICAL PREFABRICATED PIERFIGURE 502.6

TYPICAL MAINFRAME

(SEE PIERINSTRUCTIONS)

OVER-EXTENDEDSHALL NOT BE

ADJUSTABLESCREW

1" X 4" X 8"WOOD WEDGES

SHOWN- ALTERNATE

DIRECTION

TYPICAL 256 SQUARE INCHPOURED CONCRETE FOOTING

TYPICAL 256 SQUARE INCHPOURED CONCRETE FOOTING

TYPICALPOUREDCONCRETEFOOTING

TYPICALPREFABRICATED

PIER- TESTED, LISTED,

AND LABELED(MINIMUM 4000 LBS

CAPACITY)

reinforcing bars. The reinforcing bars shallbe centered vertically in the runner, teninches (10") apart and shall not be closerthan three inches (3") from the edge. Therunner shall be centered beneath themainframe. See Figure 502.2. Theserunners may be poured wide enough toinclude the outer mainframe and perimetersupports, or the inner mainframes andmarriage line supports, on the same runner.If runners are poured wide enough toinclude two or more rows of supports two(2) continuous three-eighths inch diameter(#3) reinforcing bars shall be used for eachrow of supports. The reinforcing bars shallbe centered vertically in the runner, spacedequidistant apart, and shall not be closerthan three inches (3") nor farther than sixinches (6”) from the edge.

02. Block Piers. Concrete block piers shall beplaced on approved minimum two hundredfifty-six (256) square inch (or sized as requiredfor ridge beam column supports) footings andshall not exceed the size of the footing. Blockpiers shall be capped and shimmed withapproved components. Piers shall be:

a. Concrete block. The blocks shall beeither open or closed cell precastlightweight concrete of nominal size ofeight inches by eight inches by sixteeninches (8" x 8" x 16"). Open cell blocksshall be positioned vertically. SeeFigure 502.3. Cinder or pumice blocksshall not be used.

(1) Single Stack. Block piers up tothirty-six inches (36") high under themain frame or marriage line andforty-eight inches (48") high under theperimeter walls may be single stacked.Single stacked block piers shall beplaced perpendicular to the main frameand marriage line and parallel at theperimeter wall. See Figure 502.3.

(2) Double Stack. Block piers overthirty-six inches (36") high under themain frame and marriage line shall bedouble stacked with blocksinterlocking. See Figure 502.4.

(3) Maximum Height. No concreteblock piers shall be constructed overeighty inches (80") in height unlessdesigned by an Idaho LicensedProfessional engineer.

(4) Capacity. Single stack block piersshall be used for loads not to exceedfive thousand (5,000) pounds. Doublestack block piers shall be used for loadsnot to exceed sixteen thousand (16,000)pounds. Double and single piers may becombined for higher loads.

03. Block Pier Caps. Each block pier shall becapped with a pier cap equal in area to the pierblocking (i.e., 8" x 16" or 16" x 16"). SeeFigures 502.3, 502.4, and 502.5. Pier capsshall be one or more of the following.

a. Precast Block. A solid concrete blockwith a nominal thickness of four inches(4").b. Plywood. One (1) piece of one andone-quarter inch (1-1/4") thick plywood,or two (2) pieces of three-quarter inch(3/4") thick plywood.c. Lumber. One (1) two inch (2")nominally thick Number 2 (#2) or bettergrade lumber.d. Polymer. One (1) two inch (2")nominally thick wood polymer composite.e. Other. Listed or equivalent materialsapproved by the Division and theManufactured Home InstallationCommittee.

04. Block Pier Shims. Where shim material isused between the top of the pier cap and thebottom of the main frame, the shimming

IMHIS Chapter 5 - Permanent Foundation Installation Standards2004 Edition

33

material shall not exceed five inches (5")vertically. See Figure 502.5. Pier shims, whenused, shall be one or more of the following;

a. Precast Concrete. Two inch (2") thicksolid concrete blocks equal in area to thepier cap;b. Plywood. Three-quarter inch (3/4") orthicker plywood equal in area to the piercap;c. Lumber. Two inch (2") nominallythick Number Two (#2) or better gradelumber not less than five and one-halfinches (5-1/2") in width and sixteen inches(16") long;d. Polymer. One and one-quarter inch(1-1/4") minimum thickness wood polymernot less than five and one-half inches(5-1/2") in width and sixteen inches (16")long; ore. Other. Listed or equivalent materialsapproved by the Division and theManufactured Home InstallationCommittee.

05. Block Pier Wedges. No more than twosets of wedges three-quarter inch (3/4") thickor one set of wedges one and one-half inches(1-1/2") thick by three and one-half inches(3-1/2") wide by eight inches (8") to sixteeninches (16") long may be used. They must befitted perpendicular with, and driven tight to,the bottom of the main frame or floor totransfer loads uniformly to the pier. See Figure502.5.06. Prefabricated Piers. Prefabricated piersshall be placed on approved footings and shallnot exceed the size of the footing. See Figure502.6. Piers shall be:

a. Tested and Listed. All prefabricatedpiers shall be tested, listed, and labeled fora capacity of not less than four thousand(4,000) pounds. See Subsection 303.02.

b. Instructions. The installation of thepiers shall be in compliance with piermanufacturers' instructions which shall beleft with the home.c. Shims. No shims shall be used with aprefabricated pier.d. Adjustable Heads. All piers shall beof the type fitted with an adjustable headand nut. The adjustment shall not exceedthat permitted by the manufacturer'sinstructions.

07. Other piers. Other piers may be used onlyby approval of the Division of Building Safetyand the Manufactured Home InstallationCommittee.

503. INSTALLATION SUPPORTREQUIREMENTS.

01. Main Frame Supports. The main frameof all permanent foundation set manufacturedhome installations shall be supported asprescribed in the following Subsections. SeeFigure 503.1. All materials and componentsshall comply with the requirements of Section303.

a. Footings for PermanentFoundations. The footings for the supportpiers under the main frames of a permanentfoundation set manufactured home shall bepoured in place concrete pads. SeeSubsection 502.01.a. The homeownermay opt to have eight inch (8") thickpoured concrete footing runners (SeeSubsection 502.01.b.), but they shall notbe required by the local authority havingjurisdiction, dealers, or installers.

(1) Exception: When a permanentfoundation for an existing standard sethome is being installed, (SeeSubsection 504.02.) any of thefootings in Subsection 402.01 whichare already in place are approved.


34

c. Piers. The piers for the support ofmain frames shall be any of the piers inSubsections 502.02, 502.06, or 502.07.When block piers are used they shall beplaced perpendicular to the main frame.d. Location of Supports. The footingsand pier stands under the main frame shallbe placed not more than thirty inches (30")from the ends of the frames . The footingsand pier stands shall continue to be set sixfeet (6') on center the full length of theframe. A six inch (6") variance is allowableto clear obstructions. This spacing shall be

maintained in all roof loads up to andincluding one hundred twenty pounds persquare foot (120 psf).

02. Perimeter Supports. Manufacturedhomes installed on a permanent foundationshall have the entire perimeter of the homesupported by the foundation walls. Allmaterials and components shall comply with therequirements of Section 502.03. Marriage line Supports. The marriageline rim joists and ridge beam columns ofpermanent foundation set multi-sectionmanufactured homes shall be supported as


35

RIDGE BEAM COLUMN SUPPORTS

MARRIAGE LINE RIMJOIST SUPPORTS

MAIN FRAME SUPPORTS

PERMANENT FOUNDATION SUPPORT SYSTEMFIGURE 503.1

MAIN FRAMESUPPORTS

RIDGE BEAMSUPPORTS

MARRIAGE LINERIM JOISTSUPPORTS

LOCATED WITHIN 30 INCHES OF EACH END AND 6 FT O.C. FOR ALL ROOF LOADS

LOCATED AS REQUIRED AND MARKEDBY THE MANUFACTURER

LOCATED 8 FT O.C. FOR ALL ROOF LOADS 30 PSF AND GREATEREXCEPT WHEREVER THERE IS A WALL ABOVE THE MARRIAGE LINETHEN SUPPORTS SHALL BE LOCATED 6 FT O.C. FOR 40 PSF; 4 FT O.C.FOR 60 PSF ; 3 FT O.C. FOR 80 PSF; 2 FT O.C. FOR 100 PSF OR OVER.

FOUNDATIONSUPPORT REFER TO SECTION 504

FOUNDATION WALL

prescribed in the following Subsections. SeeFigure 503.1. All materials and componentsshall comply with the requirements of Section303.

a. Marriage Line Rim Joist Supports.The entire marriage line shall be supportedby minimum two hundred fifty-six (256)square inch poured in place footings andpiers. See Subsections 502.01, 502.02,502.06, or 502.07. b. Ridge Beam Column Supports.Marriage line roof ridge beam columnsupports shall comply with therequirements prescribed in the followingsubsections.

(1) The manufacturer shall identify in adiagram the load on, and the locationof, each column. The diagram shall beprovided to the homeowner, and uponrequest, to the dealer, installer, andlocal authority having jurisdiction.

(2) The manufacturer shall clearlymark the location of each column.These markings shall remain visible forinspection after the installation iscompleted.

(3) The installer shall use themanufacturer's diagram and markings todetermine locations and loads ofcolumn supports.

(4) The installer shall use Table 500-Ato determine the size of footingrequired for each column load.

(5) Footings for marriage line roofridge beam support columns shall beconstructed according to either one ofthe following two methods.

(a) Poured in place concrete pads aminimum of eight inches (8") nominalthickness with two (2) three-eighths

inch diameter (#3) reinforcing bars ineach direction.

(b) A poured concrete footingrunner a minimum of eight inches (8")nominal thickness by twenty inches(20") wide with two properlypositioned three-eighths inch (#3)reinforcing bars. See Subsection502.01.b.

c. Piers. Marriage line piers shall beconcrete block or listed prefabricatedpiers. See Subsections 502.02 and 502.06.All ridge beam columns with a load inexcess of five thousand pounds (5,000 lbs.shall have multiple blocked concrete piersor prefabricated piers listed and labeled tosupport the load either by itself or incombination with another pier.d. Location of Supports. Marriage linesupports shall be located as prescribedbelow. See Figure 503.1.

(1) The foundation wall shall be thefirst support at each end. (2) Ridgebeam column supports shall be sizedand located per the diagrams suppliedby the manufacturer for each home andTable 500-A.

(3) Marriage line rim joist supportsshall be located along the entire lengthof the marriage line as prescribedbelow.

(a) Eight feet (8') on centermaximum for all roof loads thirtypounds per square foot (30 psf) andgreater. Thirty pounds per squarefoot is the minimum permissible snowload rating in Idaho for newmanufactured homes.

(b) Six feet (6') on center maximumfor roof loads over forty and up tosixty pounds per square foot (40 to


36

60 psf) wherever there is a wall abovethe marriage line.

(c) Four feet (4') on centermaximum for roof loads over sixtyand up to eighty pounds per squarefoot (60 to 80 psf) wherever there isa wall above the marriage line.

(d) Three feet (3') on centermaximum for roof loads over eightyand up to one hundred pounds persquare foot (80 to 100 psf) whereverthere is a wall above the marriageline.

(e) Two feet (2') on centermaximum for roof loads over onehundred pounds per square foot (100psf) wherever there is a wall abovethe marriage line.

(f) As an alternate support system tothat specified in (d) and (e) above, amarriage line pony wall may beconstructed of minimum two inch bysix inch (2" x 6") nominal size studs,twenty-four inches (24") on center,with double top and single (treated)bottom plates to support the marriage


37

The footing sizes shown are for square pads and are based on the area (square inches) requiredfor the load. Other footing configurations, such as a rectangular configuration, may be used,provided the area (square inches) is equal to or greater than the area of the square footingshown in the table. For example, a 12-inch x 22-inch (264-square-inch) footing may be used inplace of a 16-inch x 16-inch (256-square-inch) footing. Also, two 12-inch x 24-inch pads may be used in place of one 24-inch x 24-inch pad.

19,00043 x 438,00028 x 28

18,00042 x 427,50027 x 27

17,00040 x 407,00026 x 26

16,00039 x 396,50025 x 25

15,00038 x 386,00024 x 24

14,00037 x 375,50023 x 23

13,00035 x 35 5,00022 x 22

12,00034 x 344,50021 x 21

11,00032 x 324,00020 x 20

10,00031 x 313,50018 x 18

9,00030 x 303,00017 x 17

8,50029 x 292,50015 x 15

Capacity(Pounds)


Capacity(Pounds)


Table 500-A

line. A four inch by six inch (4" x 6")nominal size post shall be placed inthis pony wall at all ridge beamsupport locations identified by themanufacturer. All wood shall have astructural rating equal to, or greaterthan, #2 SPF.

(g) Ridge beam column supportsmay be considered to be rim joistsupports as long as the maximumallowable spacing between supportsis not exceeded.

04. Height of Installation. No more thantwenty-five percent (25%) of the main framepier supports of a manufactured home shallexceed thirty-six inches (36") in height withoutprior approval of the local authority havingjurisdiction, unless it is set on a basement. SeeSection 504.03. Pier heights shall be measuredfrom the top of the footing to the bottom of theframe. See Figure 502.5. Maximum pier heightshall not exceed eighty inches (80").

504. PERMANENT FOUNDATIONS.

01. Permanent Foundation. A PermanentFoundation is a perimeter supportingfoundation wall which is constructed ofconcrete, concrete block, or pressure treatedwood, on a concrete footing placed below thelocally established frost depth. See Figure301.2. This permanent foundation is used inconjunction with main frame and marriage linesupports required in Section 503.Manufactured homes must be permanentlyaffixed to a foundation to qualify as realproperty for tax and financing purposes.

a. Concrete Foundation. A poured inplace perimeter concrete foundation shallcomply with the requirements prescribed inthe following Subsections. See Figures504.1A, 504.2A, and 504.2B.

(1) Footings. The foundation footingsshall be a minimum eight inches (8")thick by sixteen inches (16") wide ofcontinuous poured concrete with twohorizontal three-eighths inch diameter(#3) reinforcing bar.

(2) Stem Walls. The foundation stemwall shall be a minimum six inches (6")thick by twenty-three inches (23") highpoured concrete with one horizontalthree-eighths inch diameter (#3)reinforcing bar per eighteen inches(18") of height. Maximum stem wallheight shall not exceed forty-eightinches (48") for over twenty-fivepercent (25%) of the home unless thehome is installed on a basement wall asdefined in Subsection 504.03, or thedesign is approved by the localauthority having jurisdiction. All stemwalls over thirty inches (30") in heightshall have vertical three-eighths inchdiameter (#3) reinforcing bar,thirty-two inches (32") on center, to tiethe footing and wall together.

(3) Sill Plate. The stem wall shall havea sill plate of two inch by four inch (2"x 4") nominal size foundation graderedwood or pressure treated lumberattached with one-half inch by ten inch(1/2" x 10") anchor bolts six feet (6') oncenter and within twelve inches (12") ofeach corner.

b. Block Foundation. A concrete blockwall foundation shall comply with therequirements prescribed in the followingSubsections. See Figure 504.1B.

(1) Footings. The footings for aconcrete block foundation shall be aminimum eight inches (8") thick bysixteen inches (16") wide continuouspoured concrete with two horizontalthree-eighths inch diameter (#3)


38


39

4" CLR

TOP ROW OFBLOCK FULLGROUTED

4" CLR

TIE DOWN ANCHOR MAX.24" FROM ENDS ANDMAX 11'-0" O.C.HOOKED TO REBAR

4" CLR

8" X 8" X 16" CONCRETE BLOCKPERMANENT FOUNDATION

FIGURE 504.1B

TIE DOWN ANCHORMAX 24" FROM ENDSAND MAX 11'-0" O.C.HOOKED TO REBAR

#3 REBARVERTICAL 32" O.C.

(2) #3 REBARCONTINUOUS HORIZ.

POURED CONCRETEPERMANENT FOUNDATION

FIGURE 504.1A

PRESSURE TREATED WOODPERMANENT FOUNDATION

FIGURE 504.1C

2X4 SILL PLATE PRESSURETREATED OR REDWOOD1/2" DIA X 10" LONGANCHOR BOLT AT MAX6'-0" O.C. AND 12"FROM CORNERS.INSTALL RECESSEDWASHER AND NUT ONEA. BOLT

CONCRETE BLOCKFOUNDATION WALL8" X 24" MIN8" X 48" MAX(1) #3 REBARCONTINUOUS HORIZFOR BOND BEAM

16" X 8" CONC. FOOTING

2X4 SILL PLATE PRESSURETREATED OR REDWOOD1/2" DIA X 10" LONGANCHOR BOLT AT MAX6'-0" O.C. AND 12"FROM CORNERS.INSTALL RECESSEDWASHER AND NUT ONEA. BOLTCONCRETEFOUNDATIONWALL6" X 23" MIN6" X 48" MAX

#3 REBAR VERTICAL32" O.C. (REQ'D FORWALL OVER 30" HIGH)

(1) #3 REBARCONTINUOUS HORIZPER 16" HEIGHT

(2) #3 REBARCONTINUOUS HORIZ.

TIE DOWN ANCHORMAX 24" FROM ENDSAND MAX 11'-0" O.C.HOOKED TO REBAR


(2) #3 REBAR CONTINUOUS HORIZ.


2X4 PRESSURE TREATED TOP PLATE(2) 16d GALVANIZED NAILS (END NAIL)

2X4 STUDS AT 16" O.C. PRESSURE TREATED

PRESSURE TREATED 1/2" PLYWOOD(2) 16d GALV. NAILS (END NAIL)

16d GALV. NAIL @16" O.C. (@ TOP PLATE TO MFG HOME)

8d STAINLESS STEEL NAILS @ 6" O.C. AT PANEL EDGES & 12" O.C.@ INT SUPPORTS OR 16 GA. X 1-1/2" STAINLESS STEEL STAPLES@ 4" O.C. AT PANEL EDGES AND 8" O.C. AT INTERIOR SUPPORTS

2X4 PRESSURE TREATED SILL PLATE BOLTED WITH1/2" DIA X 7" LONG GALV. ANCHOR BOLT AT MAX6'-0" O.C. AND 12" FROM CORNERSINSTALL WASHER AND NUT ON EACH BOLT


40

6" CONCRETEFOUNDATION WALL(23" MIN HIGH48" MAX HIGH)

16" X 8"CONCRETEFOOTING

2X4 REDWOOD ORPRESSURE TREATEDSILL PLATE

16" X 6"" FOUNDATION VENTMAX 36" FROM CORNERS ANDMAX 20'-0" O.C.

MARRIAGE LINE

24" MIN

36" MIN

MAIN FRAME BEAMPIER

6 MIL. VAPORBARRIER

TIE DOWN

2X4 SILL PLATE (PRESSURE TREATED OR REDWOOD)BOLTED WITH 1/2" DIA X 10" LONG ANCHOR BOLTSAT MAX 6'-0" O.C. AND MAX 12" FROM CORNERS.INSTALL RECESSED WASHER AND NUT ON EACH BOLT

MIN 5% SLOPEFROM FOUNDATION

6 MIL VAPOR BARRIER

CONCRETE FOUNDATION PLANFIGURE 504.2A

SECTION THROUGH CONCRETE FOUNDATIONFIGURE 504.2B

6" MINCONCRETE BLOCKPIER(OR METAL PIER)

256 SQ IN (8" X 16" X 16")PIER PAD MAX 6'-0" O.C.

MARRIAGE WALLRIM JOISTSUPPORTFOOTINGSSEE SECTION503.03

MIN 24" X 36"ACCESS WITHCOVER

RIDGE BEAM COLUMNSUPPORT FOOTINGSSEE SECTION 503.03

MAIN FRAME BEAM (TYP)

CONCRETEFOUNDATION(FIGURE 504.1A)

24" MINFROST COVERTO BTM. OFFDN.VERIFY REQ'DDEPTH WITHLOCAL BLDG.DEPARTMENT

TIE DOWN ANCHOR(SEE 505.04 FOR SPACING)

MARRIAGE LINE RIDGE BEAMPOST SUPPORT PER TABLE 500-A

CONCRETE PIER PAD(FIGURE 502.1)

TIE DOWN ANCHORS INSIDE WALL FOOTINGS (SEE 505.04 FOR SPACING)

23" M

IN48

" MAX

reinforcing bar. Vertical reinforcing barshall be placed in the footing withintwelve inches (12") of the ends andthirty-two inches (32") on center andshall extend in height to within twoinches (2") of the top of the top courseof blocks.

(2) Stem Wall. The stem walls of ablock foundation shall be constructed ofeight inch by eight inch by sixteen inchnominal size (8" x 8" x 16") concreteblocks mortared together for aminimum of three (3) rows and amaximum of six (6) rows. Each cellwhich contains a vertical reinforcing barextending up from the footing shall becompletely filled with mortar. Athree-eighths inch diameter (#3)reinforcing bar shall be placed in the topcourse to form a bond beam and allcells in the top course of blocks shall befilled with grout.

(3) Sill Plate. The stem wall shall havea sill plate of two inch by four inch (2"x 4") nominal size foundation graderedwood or pressure treated lumberattached with one-half inch by ten inch(1/2" x 10") anchor bolts grouted in theblock space a maximum of six feet (6')on center and within twelve inches(12") of each corner.

c. Pressure Treated Wood Foundation.A foundation of pressure treated lumbershall comply with the requirementsprescribed in the following Subsections.See Figure 504.1C.

(1) Footings. The footings for apressure treated lumber foundation shallbe a minimum eight inches (8") thick bysixteen inches (16") wide continuouspoured concrete with two horizontalthree-eighths inch diameter (#3)reinforcing bar. The footing shall have

one-half inch by seven inch (1/2" x 7")anchor bolts within twelve inches (12")of each corner and six feet (6') oncenter to secure the bottom plate of thestem wall to the footing.

(2) Stem Wall. The stem wall shall bea minimum of twenty-four inches (24")and a maximum of forty-eight inches(48") in height. It shall be constructedof two inch by four inch (2" x 4")nominal size pressure treated studsspaced sixteen inches (16") on centerwith pressure treated top and bottomplates. The top plate shall be fastened tothe bottom of the home with galvanizedthree and one-half inch (3 1/2") long(16d) nails. It shall have an exteriorenclosure of pressure treated plywoodsecured on all studs and plates withstainless steel fasteners. The pressuretreated plywood shall be fifteen-thirtyseconds inch (15/32") thick with athirteen-sixteenths (13/16) span indexfor walls up to thirty-two inches (32")high and nineteen-thirty seconds inch(19/32") thick with a forty-twentieths(40/20) span index for walls higher thanthirty-two inches (32"). The stainlesssteel fasteners shall be either two andone-half inch (2 1/2") long (8d) nails atsix inches (6") on center on all edgesand twelve inches (12") on center oninterior studs, or sixteen (16) gauge oneand one-half inch (1 1/2") staples atfour inches (4") on center on all edgesand eight inches (8") on center oninterior studs. All wood shall bepressure treated according to AWPAstandards and shall be stamped AWPAFDN.

d. Other Permanent FoundationDesigns. Other permanent foundationsystems that are engineered and stamped


41


42

CERTIFIED TIEDOWN STRAP

EXISTING MFG HOMEFLOOR STRUCTURE

EXISTING MAIN FRAMEBEAM

EXISTING SHIM

EXISTING PIER

EXISTING PIER PAD

6" MIN

SIDING

EARTH BERMEXISTING HUD CODE MFG. HOME

24" MIN

BUILDING SECTIONFIGURE 504.3A

FOUNDATION SECTION DETAILFIGURE 504.3B

VERIFY REQ'D FROSTCOVER DEPTH WITHLOCAL BLDG DEPT

PRESSURE TREATEDWOOD FOUNDATION(FIG 504.1C)

VAPORBARRIER

ALL-WEATHERWOOD FOUNDATION(FIGURE 504.1C)

LANDSCAPEEARTHRETAINERS

(2) 10d GALV.TOE NAIL

(2) 10d TOENAIL

EXISTING FLOOR RIM JOIST(1) 16d GALV. NAIL@ 16" O.C.

PRESSURE TREATED2X4 FRAMING

16"O.C.

ALL WEATHER WOOD FOUNDATION FOR AN EXISTING MFG. HOMEFIGURES 504.3A, 504.3B, 504.3C

FOUNDATION ELEVATION DETAILFIGURE 504.3C

PRESSURE TREATEDPLYWOOD(SEE FIGURE 504.1C)

CONCRETEFOOTING(SEE FIG 504.1C)

1/2" X 7" ANCHOR BOLT(SEE FIG. 504.1C)

LANDSCAPE EARTHRETAINERS

48" MAX


43

OPENINGS MAY BE LOCATED IN THE MARRIAGE LINE WALL AT THE SAMELOCATIONS AS OPEN SPANS IN THE MANUFACUTERED HOME ABOVE

2X4 MARRIAGE LINE WALL MUST BE LOCATEDUNDER ALL WALLED AREA IN THE HOUSE

MAIN FRAMEBEAMS

4X6 POST UNDER EARIDGE BEAM POST

8" WIDEFLANGEBEAM

DOOR OPENING

STAIRS

MIN 42" X 36" LANDINGWINDOW

(EGRESS IN BEDROOMS)

4X6 POSTUNDER MAIN

FRAME

2X4 STUDWALLS(TYP)WALLS MAY

CONTINUE TODIVIDE ROOMS

STAIRWAY MAY BEMOVED TO ALTERNATELOCATION

3'-0"

WALLS MAY CONTINUEACROSS TO DIVIDEROOM

4" RECESSFOR BEAMSUPPORTWITH STEELBEARINGPLATE

4" X 6" SUPPORT POST UNDERWIDE FLANGE BEAM

DRAINAGE PERLOCAL CODEREQUIREMENT

ATTACHMENT OF THE MFG HOME SHALL BE 48" O.C. EITHER INSIDETO FLOOR JOINTS OR OUTSIDE TO RIM JOIST WITH PREFABRICATEDFOUNDATION CLIPS OR PLATES

(2) 2X8 REDWOOD OR PRESSURE TREATED PLATES BOLTED 12"FROM CORNERS AND 6'-0" O.C. WITH 1/2" DIA X 12" ANCHOR BOLTS

6" MIN

5% SLOPE

8"

1'-8"

8" THICK CONCRETE WALLSWITH #4 REBAR @ 18" O.C.HORIZ AND VERT

16" X 8" THICKENED SLABFOOTING UNDER WALLS

20" X 8" CONCRETE FOOTINGWITH (2) #4 REBAR

24" X 8" CONT MARRIAGE LINEFOOTING WITH (2) #4 REBAR

WELD

12' MAX SPACING

DAMP-PROOFING

CROSS SECTION THROUGH BASEMENTFIGURE 504.4A

BASEMENT FOUNDATION PLANFIGURE 504.4B

2 X 4 NAILED TO FLOOR JOISTS(FOR SIDE PRESSURE)

THE MFG HOME MAIN FRAMEMAY BE SUPPORTED BY EITHERAN 8" WIDE FLANGE BEAM ORWITH 2" X 4" WALLS WITH 4" X 6"POSTS UNDER EACH MAIN FRAME(OR COMBINATION)

7'-6

" MIN

7'-0

" MIN

8' M

IN (1

0' M

AX)

by an Idaho Licensed ProfessionalEngineer, and which have been approvedby the Division and the ManufacturedHome Installation Committee, may beused.f. Frost Protection. All footings forpermanent foundations shall be placed aminimum of twenty-four inches (24")below grade, or according to the acceptedfrost level of the jurisdiction. Footingsshall be on undisturbed or engineered andtested compacted soil.g. Vents. All foundations shall be ventedwithin three feet (3') of each corner andwith twenty foot (20') maximum spacing.h. Installation. The manufactured homeis to be installed with the perimeter wallssupported on the foundation wall and themain frames supported according toSubsection 503.01. The marriage lineshall be supported in accordance toSubsection 503.03.i. Recesses and Decks. When amanufactured home has a factory installeddeck, porch, or recessed entry larger thanthirty-six (36) square feet which has opendecking a stem wall shall encompass thatarea to separate it from the remainder ofthe foundation. The stem wall shall have afooting, and be a minimum of twelveinches (12") high. No vapor barrier shall beinstalled under this open deck area.

02. Foundations for Existing Home. Existingstandard set manufactured homes (See Figure301.1) may be converted to a permanentfoundation set by placing the home onto anyone of the three foundations described inSection 504.

a. If a concrete or block stem wall(Subsection 504.01.a(2) or Subsection504.01.b(2)) is used, the home will need tobe raised (or moved) in order to pour

concrete into wall forms or to fill the cellsof the concrete blocks, and to attach thesill plate. The home will be then placedback onto the foundation.b. If a pressure treated foundation (SeeSubsection 504.01.c.) is used, the topplate shall be secured to the bottom of thehome with three and one-half inch (3 1/2")long (16d) galvanized nails and the bottomplate shall be bolted to the footing. Thestuds of the stem wall shall be tightly fittedbetween the top and bottom plates and toenailed with three inch (3") long (10d)galvanized nails to provide support underthe walls of the home. See Figure 504.3C.The exterior enclosure shall be accordingto Subsection 504.01.c(2). Installing thissystem does not require the home to beraised.c. The footings must be below frost depthbut no less than twenty-four inches (24")below grade. The foundation wall must bebackfilled to that depth. The grade must besloped a minimum of five percent (5%)from the foundation wall. A "flower bed"effect may be created by placing landscapeties or timbers three feet (3') from thehome and then filling this area withbackfill. See Figures 504.3A and 504.3B.d. Check and correct the supports underthe main beams (See Subsection 503.01.a(1)) and marriage line. SeeSubsection 503.03. All ridge beamsupport columns must be on footings ofminimum five hundred twelve (512) squareinches.e. Check to ensure a vapor barrier is inplace under the home. If there is nobarrier, install a six one-thousandths inchthick (.006") black membrane vaporretarder. See Subsection 302.06.

03. Basement Perimeter SupportFoundation. A single or double section


44

manufactured home may be placed on abasement constructed as follows: See Figures504.4A and 504.4B.

a. Wall Footing. The perimeter footingshall be eight inches (8") thick by twentyinches (20") wide concrete reinforced withtwo (2) one-half inch diameter (#4)reinforcing bar.b. Walls. The perimeter walls shall beconcrete eight inches (8") thick by aminimum eight feet (8') and a maximum often feet (10') high reinforced vertically andhorizontally every eighteen inches (18")with one-half inch diameter (#4)reinforcing bar. The wall shall have adouble two inch by eight inch (2" x 8")nominal size redwood or pressure treatedsill plate attached to the wall with one-halfinch by twelve inch (1/2" x 12") anchorbolts one foot (1') from each corner andspaced six feet (6') on center.c. Marriage line Footing. The centerlinefooting shall be eight inches (8") thick bytwenty-four inches (24") wide with two (2)one-half inch diameter (#4) reinforcing bar.Widen the footing to thirty-six inches (36")for two feet (2') on each side of anymarriage line post which supports a crosssupporting I-beam. See Subsection 504.03.d(2).d. Support System. The manufacturedhome main frame beams shall be supportedby either of the following two methods, ora combination of the following twomethods.

(1) Cross walls of standard two inch byfour inch (2" x 4") nominal size studconstruction spaced a maximum ofevery twelve feet (12'). Each wall shallhave a four inch by six inch (4" x 6")nominal size post located directly undereach main frame beam. These walls mayextend across from the basement wall to

the centerline but are only required toextend to the I-beam support post. SeeFigures 504.4A and 504.4B. Thebottom plate must be secured to thefloor to prevent movement.

(2) An eight inch (8") by fifteenpounds per foot (15 lb/ft) I-beam maybe supported by four inch (4") deeppockets in the concrete wall and by fourinch by six inch (4" x 6") nominal sizeposts in the centerline wall. Each crossbeam shall be welded at each end to athree-eighths inch (3/8") thick platesecured into the concrete wall pocket.Each cross beam shall also be welded tothe home's main frame beams at eachpoint of contact. Maximum spacingbetween beams shall be twelve feet(12').

(3) Note that support walls or beamsplaced at the maximum spacing oftwelve feet (12') will allow the home toincur more floor vibrations than it will ifthe walls or beams are positioned moreclosely together.

e. Floor. The floor shall be a nominalfour inch (4") thick concrete slab pouredover a compacted sand and gravel base.The slab shall be thickened to eight inches(8") by sixteen inches (16") wide under allcross walls. See Subsection 504.03.d(1).f. External Pressure. A two inch by fourinch (2" x 4") nominal size board shall benailed with three and one-half inch (3 1/2")long (16d) nails to the home's floor joistsalong the sill plate on the side walls tocounter external pressure on the walls. SeeFigure 504.4A. This may be eliminated ifeither the cross walls or I-beams extendcontinuous across the basement.g. Ceiling Height. The minimum heightfrom the top of the concrete floor to a


45

ceiling which may be attached to themanufactured home main frame beamsshall be seven feet six inches (7'-6"). Ifcross I-beams are used to support themanufactured home main frame beams(See Subsection 504.03.d(2)) theminimum distance from the top of theconcrete floor to the bottom of theI-beams shall be seven feet (7'-0").h. Marriage line Wall. A marriage linewall constructed of two inch by four inch(2" x 4") nominal size studs, 16" on center,with double top and single bottom platesshall support the marriage line the entirelength of the home. The bottom plate shallbe bolted to the concrete floor withone-half inch by ten inch (1/2" x 10")anchors spaced forty-eight inches (48") oncenter. A four inch by six inch (4" x 6")nominal size post shall be placed in thiswall at all ridge beam support locations.The wall studs and posts shall be one piecefrom floor plate to top plate. Openingsover three feet (3') in width may only belocated in this wall at the same locations asopen spans in the home above.i. Anchors. The manufactured homeshall be anchored to the foundation by oneor the other of two following methods.

(1) The use of prefabricatedfoundation clips or plates located everyforty-eight inches (48") either inside oroutside the sill plate.

(2) If the home is totally supported bycross I-beams, the I-beams shall bewelded to the home's main frame beamsat each point of contact.

j. Other Designs. Other engineeredbasement plans designed and stamped byan Idaho Licensed Engineer and approvedby the local authority having jurisdictionmay be used.

04. Grading. After all aspects of thefoundation is complete, the site shall haveadequate grading as prescribed in Section 302of this standard.05. Drainage. The contractor shall assure thatproper drainage is provided around a basementor foundation in a high ground water locationin compliance with the requirements of thelocal authority having jurisdiction.06. Real Property Designation. Any homeplaced on a foundation built according toSection 504 qualifies for designation as realproperty.07. Permits and Inspections. Buildingpermits and inspections are required in anyjurisdiction having a building code. Permitsmust be obtained prior to construction. SeeSection 201.

505. ANCHORING.

01. Anchoring. To resist lateral movementfrom high winds, earthquakes, and flooding, allmanufactured homes installed on permanentfoundations shall have manufactured andapproved anchoring devices capable of resistingloads prescribed in Section 505.02. 02. Loads. Anchoring equipment including allanchors, straps, and tension devices used tosecure a manufactured home when installed,shall be capable of resisting an allowableworking load at least equal to or exceedingthree thousand one hundred-fifty pounds(3,150 lbs) and shall be capable of withstandingfifty percent (50%) overload (4,725 lbs)without failure of either the anchoringequipment or the attachment point to themanufactured home. When the stabilizingsystem is designed by a qualified IdahoLicensed Engineer, alternate working loadsmay be used, provided the anchoringequipment is capable of withstanding a fiftypercent (50%) overload.


46

03. Ties. All tie strapping shall be fastened toanchors and drawn tight with adjustabletensioning devices supplied with the anchor.

a. Tie strapping shall be certified andlisted to be capable of resisting anallowable working load of three thousandone hundred-fifty pounds (3,150 lbs) withno more than two percent (2%) elongationand shall withstand a fifty percent (50%)overload.b. Ties shall connect the anchor to themain frame I-beams which run lengthwiseunder the manufactured home. Ties shallnot connect to steel outrigger or crossmember beams which fasten to, andintersect with, the main frame I-beams.c. Tie materials shall be designed toprevent self-disconnection when ties areslack. Open hook ends shall not be used inany part of the anchoring system. SeeFigure 505.1

04. Spacing. Unless otherwise specified in theanchoring equipment manufacturer's installationinstructions, anchors shall be placed in thesidewall footing within two feet (2') from eachcorner and spaced as follows: (Also see Figure504.2A, 504.2B and Section 505.) Eleven feet(11’) maximum on center for homes up toeighteen feet (18’) in height (maximum groundto roof peak) in a seventy mile per hour (70mph) wind zone, or up to fourteen feet (14’) inheight for an eighty mile per hour (80 mph)wind zone. For homes from fourteen feet (14’)to eighteen feet (18’) in height in an eighty mileper hour (80 mph) wind zone, space anchorseight feet (8’) maximum on center.05. Certification. Anchoring equipment iscertified when tested, listed, and labeled by anationally recognized testing and listinglaboratory, or designed by a Idaho LicensedProfessional Engineer and approved by the

Division of Building Safety and theManufactured Home Installation Committee.06. Alternate anchoring systems. Alternateanchoring systems may be used when approvedby the Division and the Manufactured HomeInstallation Committee.506. -- 599. RESERVED.


47

STRAPBUCKLE

MAIN FRAME

TO ANCHOR

ALTERNATE STRAPPING SYSTEM MAYBE USED UPON PRIOR APPROVAL BYTHE DIVISION OF BUILDING SAFETY

NOTE:STRAPPING SHALL BE .035 X 1 1/4" WIDESTEEL WITH ZINC COATING APPLIED AT.80 OZ. PER FOOT AS PER ASTM 03953-87

MAIN FRAME TIE-DOWNSTRAP CONNECTION

FIGURE 505.1

FLOOR JOISTANCHOR STRAP


48

601. GENERAL.

01. Installation. All electrical work inconnection with a manufactured homeinstallation, alteration, repair, conversion, oraddition, shall be performed according to theNational Electrical Code by a Idaho LicensedElectrical Contractor or by the homeowner. Apermit is required for all electrical work.

602. ELECTRICAL FEEDERCONNECTIONS.

01. Power Supply. A manufactured homepower supply shall be provided according toArticle 550-24 of the National Electrical Code.All connections shall be made by an IdahoLicensed Electrical Contractor or thehomeowner.

603. SERVICE EQUIPMENTCONNECTION.

01. Service Equipment on ManufacturedHome. As permitted by Article 550-23(b) ofthe National Electrical Code and 24 CFR3280.803, service equipment may bepermanently installed on a manufactured homeif:

a. The service equipment is installed bythe manufacturer at the manufacturingplant during initial construction or isinstalled on-site in a manner prescribed byArticle 550-23(b) of the 1999 NationalElectrical Code provided the home wasmanufactured after January 1, 1992;

b. The service equipment is installedaccording to Article 230 of the NationalElectrical Code;

c. The service equipment is installed onthe manufactured home as close as

possible to the site's electrical service asdesignated by the applicable electric utilitycompany; and

d. The service equipment is groundedaccording to Article 250 of the NationalElectrical Code.

Note. The following information is notadopted as part of this standard but isreferenced in this standard for the convenienceof the user. Users should review the codeprovisions cited to determine if any of therequirements have changed.

a. Article 550-23(a) of the NationalElectrical Code requires that manufacturedhome service equipment be readilyaccessible, be located in sight of themanufactured home, and shall not belocated more than thirty feet (30') from theexterior wall of the manufactured home.

02. Service Clearances. Service conductorsshall maintain the overhead clearances requiredby Article 230-24 of the National ElectricalCode. Underground installation clearances shallbe as required by Article 300 of the NationalElectrical Code or as may be required by theelectric utility company. See Figure 603.1.

604. ELECTRICAL CROSSOVERCONNECTIONS.

01. Crossover Connection. Each circuit shallbe connected to the corresponding color codedor marked circuit of the adjacent section in anapproved manner. The connection shall bemade by an Idaho Licensed ElectricalContractor or the homeowner.

02. Chassis Bonding. Each chassis shall bebonded to the adjacent chassis with a solid or

Chapter 6ELECTRICAL CONNECTIONS

49

Chapter 6 - Electrical Connections IMHIS2004 Edition

50

5'-0" MIN BELOWGROUND LEVEL

24" MIN

4' MIN6' MAX

30'-0" MAXIMUM

2" FLEXIBLE CONDUIT OROTHER APPROVED CONDUITABOVE GRADE

24" MIN DIRECT BURIAL

RIGID CONDUIT18" MIN

8' MIN CLEARANCE ABOVE(SEE EXCEPTIONS

NEC 230-24(a)

PVC CONDUIT18" MIN DEPTH

10' MIN HEIGHT ABOVE GRADE ACCESSIBLE TO PEDESTRIANS12' MIN HEIGHT OVER PRIVATE DRIVEWAYS15' MIN HEIGHT OVER PUBLIC DRIVEWAYS18' MIN HEIGHT OVER ALLEYS OR STREETS

CLASS 6PRESSURETREATED POLE

W

GG

WB

B

SHIP-LOOSE LIGHT INSTALLATIONFIGURE 605.1

LIGHT FIXTURE

JUNCTION BOX

WIRE NUTS NOTE:CONNECT TO CORRESPONDINGCOLOR CODED OR MARKEDCONDUCTORS

SHIP-LOOSE FAN INSTALLATIONFIGURE 605.2

JUNCTION BOX

WIRE NUTS

FAN MOTORHOUSING

FIXTURESECUREMENTBRACKET

SECURE PER FAN MANUFACTURER'SINSTALLATION INSTRUCTIONS

NOTE:CONNECT TOCORRESPONDING COLORCODED OR MARKEDCONDUCTORS

ROOF

(2) 8' X 5/8"GROUND RODSMIN 6' APARTWITH #6COPPERGROUND WIRE

SERVICE CONDUCTOR CLEARANCESUNDERGROUND FEEDER

FIGURE 603.1

stranded, green insulated or bare, No. 8 copperconductor, or by an equal bonding method.

605. ELECTRICAL EQUIPMENT.

01. Shipped Loose Equipment. Electricalequipment such as ceiling fans, chandeliers,exterior lights, and mechanical equipmentwhich are shipped loose with the manufacturedhome shall be installed on-site according to theNational Electrical Code, and the productmanufacturer's listings. Wiring connections ofshipped-loose electrical equipment shall beconnected to the corresponding color coded ormarked conductors to all applicable provisionsof the National Electrical Code. See Figures605.1 and 605.2.

02. Bonding Strap Removal. 240 voltappliances, such as ranges and dryers, shallhave the bonding strap between the ground andneutral conductors removed before installationin a manufactured home. Cords used on 240volt appliances shall have 4 conductors and 4prongs when connected to a manufacturedhome.

606. ELECTRICAL TESTING.

01. Testing. At the time of installation, allmanufactured homes shall be tested as follows:

a. All 120 volt electrical receptacleoutlets shall be subjected to a polarity testto assure that connections have been madeproperly;

b. All shipped-loose fixtures shall besubjected to a polarity test to assure thatconnections have been made properly;

c. All receptacles protected by a groundfault circuit interrupter (GFCI) shall betested with a GFCI tester;

d. All grounding and bonding conductorsinstalled or connected during the

manufactured home installation shall betested for continuity; and

e. All electrical lights, equipment, groundfault circuit interrupter, and appliancesshall be subjected to an operational test todemonstrate that all equipment isconnected and in working order.

607. -- 699. RESERVED.

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701. GENERAL.

01. Connections. Plumbing installationsinvolving the connection of the manufacturedhome to the site water and sewer utilities shallbe plumbed according to the Idaho State Code54-2601 and the Uniform Plumbing Code.

02. Installer. Plumbing installations to connectthe manufactured home to site water and sewerutilities may be performed by any one of thefollowing:

a. A manufactured home installer with aspecialty contractor license orjourneyman's license, (which limits thework to under the perimeter of the home).

b. Idaho State Licensed Plumber.

c. The homeowner.

03. Location. All site utility plumbinginstallations outside the fixed limits of theperimeter of the manufactured home shall beinstalled by a licensed plumbing contractor,excavator, or the homeowner.

04. Permits. All plumbing installations requirea permit and an inspection by a state authorizedinspector.

702. SHIP-LOOSE PLUMBING.

01. Ship-Loose Plumbing. Manufacturedhome underfloor drain pipe systems may beshipped by the manufacturer in one of thefollowing methods:

a. Complete and ready to be connected tothe site sewer utility;

b. Loose in one or more pre-assembledsections to be attached to the site sewerutility;

c. Loose sections intended to assembledon-site as approved by the DAPIA and inaccordance with the manufacturer'sinstructions.

703. WATER CONNECTIONS.

01. Water Connections. The installation andconnection of the manufactured home waterdistribution system to the site water utility shallbe limited to under the perimeter of the home,and shall be done by a Licensed ManufacturedHome Installer, a Licensed PlumbingContractor or the homeowner. The installationshall require a permit and shall be inspected.

02. Material. Water service pipe installed to amanufactured home shall be of approved typematerial, UPC, Section 1004.

Note. The following information is notadopted as part of this standard but referencedin this standard for the convenience of the user.Users should review the code provisions citedto determine if any of the requirements havebeen changed.

a. As required by the Uniform PlumbingCode, Section 1005, an accessible full wayshutoff valve shall be provided on thewater supply serving the manufacturedhome.

b. As required by the UPC, Section 1009,the water inlet shall be connected to thesite water supply by an approvedconnector not less than three-quarter inch(3/4") nominal diameter.

c. As required by the UPC, Section 1007-B, where static water pressure exceedseighty pounds per square inch (80 psi) at

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the supply, a pressure reducing valve shallbe installed.

d. As required by the UPC, Section315-F, water inlets shall be protected fromfreezing by insulating the pipe and/or usingan electric heat tape listed for use withmanufactured homes.

e. As required by 24 CFR 3280.609(b),the water pipe crossover on multi-sectionmanufactured homes shall be connectedwith the connectors supplied by themanufacturer. See Figures 703.1 and703.2. When the manufacturer's connectoris not available the connector shall consistof an approved flexible water connectorsized no less than the waterlines beingconnected or shall be fabricated from otherapproved materials. Exposed water linecrossover connections shall be insulated toprotect them from freezing.

f. As required by the UPC, Section1007-E, water heater pressure relief valvedrain pipes shall not be terminated, norallowed to discharge, beneathmanufactured homes but shall be extendedto the exterior of the perimeter of thehome.

g. Water service shall be installedaccording to the following requirements:

(1) No water pipe shall be installed orpermitted outside of a building orexterior wall unless adequate provisionsare made to protect the pipe fromfreezing.

(2) There shall be no connectionsbetween potable and non-potable water.

03. Water Valve Access. The full way mainvalve shall be installed between the waterservice utility and the manufactured home

connection, within the crawl space enclosure ata readily accessible location.

04. Water Utility Size. The size of waterservice required shall be determined byreferring to UPC chapter 10, Tables 101 and102. The minimum requirement is athree-quarter inch (3/4") nominal size serviceline.

704. DRAIN AND SEWERCONNECTIONS.

01. Drain Connection. The installation andconnection by a Licensed Manufactured HomeInstaller of the manufactured home drain to thesewer utility shall be limited to under theperimeter of the home. Installation outside theperimeter of the home shall be according toIdaho State Code 54-2602, A-F.

Note. The following information is notadopted as part of this standard but referencedin this standard for the convenience of the user.Users should review the code provisions citedto determine if any of the requirements havebeen changed.

a. As required by 24 CFR 3280.610(c),each manufactured home shall have onlyone drain outlet.

b. As required by 24 CFR 3280.610(c),each manufactured home shall beconnected to the sewer inlet by means of adrain connector consisting of approvedpipe fittings schedule 40 or heavier and anominal size of three inches (3") or larger.Listed and approved flexible connectorsshall be used to connect the drain pipe tothe sewer inlet.

c. As required by 24 CFR 3280.610, thedrain pipe crossover on multi-sectionmanufactured homes shall be connectedwith the connectors supplied by themanufacturer, or when not available, shall

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MANUFACTURED HOMEDRAIN (BUILDING DRAIN)

STRAP SUPPORTS4'-0" O.C.

MIN 12" BELOW GRADE

2'-0" MAXCLEAN-OUT

SLOPE 1/4":1'

APPROVED FLEXIBLEWATER CONNECTOR

HOTWATER

RIM JOISTCOLD WATER

FLOOR SHEATHING

HOLES IN RIMJOISTS (TYP)

REMOVABLEACCESSCOVER

RIM JOISTFLOOR SHEATHING

TYPICAL SKIRTING

APPROVED FLEXIBLECONNECTOR

SITE DRAIN PIPE

CONCEALED WATERCROSSOVER CONNECTION

FIGURE 703.1

NOTE:CONCEALED CLEANOUTS, P-TRAPS, ANDMECHANICAL JOINTS SHALL BE VISIBLEDURING TESTS. ACCESS PANELS ANDINSULATION SHALL BE REPLACED ANDSECURED AFTER ALL PLUMBING TESTSARECOMPLETED.

NOTE:EXPOSED WATER LINE CROSSOVER CONNECTIONSHALL BE INSULATED FOR FREEZE PROTECTION

EXPOSED WATERCROSSOVER CONNECTION

FIGURE 703.2

DRAIN LINE CONNECTIONFIGURE 704.1

consist of approved pipe and fittings, notless than Schedule 40 and not less indiameter than the pipes being connected.

d. As required by the Idaho StatePlumbing Code, site drain plumbing shallbe installed as prescribed in the followingSubsections. See Figure 704.1.

(1) No soil or waste pipe shall beinstalled or permitted above groundoutside of a building or exterior wall.

(2) All drain pipe shall be installed at agrade of one-quarter inch (1/4") perfoot except as otherwise permitted bythe authority having jurisdiction.

e. As required by the Idaho StatePlumbing Code, a full sized clean outextending to or above finished grade, shallbe installed at the junction of the buildingdrain and the building sewer. The clean outshall be located approximately two feet (2')from the foundation or skirting. SeeFigure 704.1.

02. Sewer Clean out Access. An accessiblesewer clean out shall be located under themanufactured home within the underfloorenclosure.

705. PLUMBING ASSEMBLY.All plumbing assemblies shall be free fromdefects, demonstrate acceptable workmanship,and be installed in conformance with acceptableengineering practices and the applicable codes.

Note. The following information is notadopted as part of this standard but isreferenced in this standard for the convenienceof the user. Users should review the codeprovisions cited to determine if any changeshave been made.

a. As required by the UPC, Section 309,underfloor water and drain plumbing shallmeet the following requirements:

(1) Threaded pipe ends shall be reamedand all burrs, chips, cutting oil, andforeign matter removed. Pipe jointcompound used on water pipes shall benontoxic and shall be applied to malethreads only;

(2) Pipe joint cement shall be ofapproved type and applied to malethreads only;

(3) Joints and connections in theplumbing system shall be gas-tight andwatertight; and

(4) All joints and connections shall becorrectly assembled for tightness. Pipethreads shall be fully engaged into thethreads of the fitting. Plastic pipe shallbe inserted to the full depth of thewelding sockets of each fitting. Pipethreads and slip joints shall not bewrapped with string, paper, putty, orsimilar fillers.

b. As required by 24 CFR 3280.608,water and drain pipe under themanufactured home shall:

(1) Be installed without undue strainsand stresses;

(2) Have provisions for expansioncontraction and structural settlement;

(3) Be supported or anchored at fourfoot (4') intervals except for plasticwater pipe which shall be secured atthirty-two inch (32") intervals;

(4) Have hangers or anchors ofsufficient strength to support the weightof the pipe and its contents; and

(5) Have hangers, clamps, brackets, oranchors which do not compress, distort,cut, or abrade the pipe. Sheet metal orplastic straps (i.e., plumbers tape) may


56

be used for support as long as the strapis flat against the pipe.

c. As required by the UPC, drainage pipeunder the manufactured home shall:

(1) Be installed according to the UPC,using the component parts supplied bythe manufacturer;

(2) Be assembled using approved pipeand fittings;

(3) Be installed to provide aone-quarter inch (1/4") per foot gradein all horizontal drain piping. When afull size clean out is installed at theupper end, the grade may be reduced toone-eighth inch (1/8") per foot;

(4) Have clean outs located so acleaning tool does not have to passthrough more than 135 degrees offittings excluding removable traps;

(5) Have clean outs installed so theyopen opposite of the flow, or at rightangles to the pipe;

(6) Be not less in diameter than thepipe it is being connected to;

(7) Use approved fitting for all changesindirection;

(8) Use 45 degree "Y" branches, 60degree "Y" branches, long turn "TY"branches, sanitary "T" branches, orother approved fittings or combinationof fittings having equivalent sweep forall horizontal to vertical drain pipeconnections; and

(9) Use 45 degree "Y" branches,long-turn "TY" branches, or otherapproved fittings or combination offittings having equivalent sweep for allhorizontal to horizontal and vertical tohorizontal drain pipe connections;

d. As per 24 CFR 3280.606, thefollowing shall be provided formanufactured home water and drainplumbing:

(1) An unobstructed minimumclearance of twelve inches (12") in frontof each clean out opening;

(2) An access panel for each trapwhich has mechanical joints and islocated inside a floor or wall;

(3) Accessibility to all water and draincrossover connections;

e. All access panels in walls and floorsshall be insulated and shall be secured inplace after all plumbing tests are complete.

f. As per 24 CFR 3280.603(6), thefollowing are prohibited:

(1) Drilling or cutting holes in drain orvent piping;

(2) Using vent pipes as waste or drainpipes except as provided by themanufacturer's original design;

(3) Using fittings which retard the flowof sewage or air;

(4) Patching or concealing cracked orimperfect pipe rather than replacing it;and

(5) Bending rigid piping rather thaninstalling directional fittings.

706. PLUMBING TESTS.

01. Water Test. The water distribution systemof the manufactured home and the supplyconnection shall be tested to assure there is noleakage under normal operating pressure.

02. Drain Test. The manufactured homedrainage piping system shall be connected tothe site sewer inlet, and tested by allowing

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water to flow into all fixtures and receptors,including the clothing washer standpipe, for aperiod of three (3) minutes. If water underpressure is not available, the drainage pipingsystem shall be tested by letting at least three(3) gallons of water into each fixture andreceptor. Each P-trap and clean out shall bevisible during this test to assure there are noleaks.

707. -- 799. RESERVED.


58

801. GENERAL.

01. Permits. A separate permit is not requiredfor the installation of heat duct crossovers orappliance exhaust ducts. This work is coveredby the manufactured home installation permit.A separate permit may be required by localordinances for alterations and all fieldinstallations of air conditioners, heat pumps,and fuel burning appliances.

02. Installations. All mechanical installationsin connection with the alteration, repair,conversion of, or addition to, a manufacturedhome shall comply with the appropriatemechanical code as adopted by local authorityhaving jurisdiction and this standard.

802. MECHANICAL EQUIPMENT.

01. Original Installations. Mechanicalconnections designed for the manufacturedhome by the manufacturer shall be installed tothe manufacturer's installation instructions.Heat pumps or air conditioners added to ahome during, or prior to, the initial sale to thefirst consumer shall be listed for manufacturedhome or mobile home use and shall be listed foruse with any manufactured home heating or airhandling equipment it is used in conjunctionwith.

02. After Market Installations. Mechanicalinstallations not a part of the originalmanufactured home shall be in conformancewith the appropriate mechanical code asadopted by the local authority havingjurisdiction and installed according to theirlistings. It is highly recommended that heatpumps, air conditioners, water heaters, andfurnaces installed in a manufactured home after

the initial sale to the first consumer be listed formanufactured or mobile home use.

03. Equipment Support. Mechanicalequipment installed outside of, and notsupported by, the manufactured home shall bemounted on a minimum three inches (3") thicklevel concrete slab, precast reinforced concreteslab, or a listed mounting base. The equipmentshall be mounted according to the applicableequipment manufacturer's installationinstructions. The top surface of the slab or baseshall be a minimum of two inches (2") abovethe finished grade. See Figure 802.1.

04. Prohibited Installations. Mechanicalequipment shall not be installed in any requiredegress window or obstruct any egress from thehome.

05. Condensation Drains. Condensationdrains from air conditioners, pumps,evaporative coolers, dehumidifiers,refrigeration equipment, or any other applianceshall not terminate under a manufactured homeand shall deliver drained liquids away from thehome.

803. CROSSOVER DUCTS.

01. General. All parts of the heating andcooling ducts system which are connected onthe site shall be installed to be mechanicallysecure, protected from ground moisture andwater, sealed with durable materials installedper the duct manufacturer's instructions, andinsulated to R-8 minimum in all new homesmanufactured after January 1, 2002. Thisincludes crossover ducts, extensions, elbows,splitter boxes, and all other components.

02. Crossover Ducts. Heat crossover ductsshall be made of the following material and

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R-8 INSULATION

1.0 PERM MINIMUM VAPOR BARRIER

FURNACE

PLENUMFLOOR JOIST

DUCTCOLLAR

REFRIGERANT LINESTO INTERIOR UNIT

MIN 3" CONCRETESLAB OR LISTEDMOUNTING BASE2" MIN ABOVE GRADE

MECHANICAL EQUIPMENT SUPPORTFIGURE 802.1

CROSSOVER DUCT CONNECTIONFIGURE 803.1

ELECTRICAL CONNECTORIN LIQUID TIGHT FLEXIBLECONDUIT OR EQUALELECTRICAL CONNECTORIN LIQUID TIGHT FLEXIBLECONDUIT OR EQUAL

TYPICAL OUTDOOR AIRCONDITIONER/HEAT PUMP UNIT

INNER LINER:- PULLED OVER EXTENSION- SEALED WITH TAPE- SECURED WITH MECHANICAL FASTENER

OUTER LINER:- PULLED UP INTO BOTTOM BOARD & FLOOR INSULATION- SECURED WITH MECHANICAL FASTENER

PENETRATIONS IN BOTTOM BOARDSEALED WITH PERMANENT TAPE

TAPE

BOTTOMBOARD

FLOORINSULATION

EXTENSIONCOLLAR

RIGID ELBOW

FURNACE

installed according to the followingrequirements. See Figure 803.1.

a. Crossover ducts on new homesmanufactured after January 1, 2002 shallhave a minimum of R-8 insulation, a vaporretarder rated at one (1.0) perm or less, aninner liner of spring steel wire helix bandedwithin two (2) layers of 57 gauge Mylarpolyester film or equal and an interiordiameter not less than that of the plenumcollars.

b. Crossover ducts shall be designed andinstalled to eliminate pressure of thebottom board and floor insulation againstthe connection. Common practice includesadding an extension and elbow to thecollar. Where such extensions and elbowsare used they shall be a minimum 26 gaugemetal, connected to the collar with at leastthree (3) sheet metal screws, and sealed atthe collar connection with minimum twoinch (2") wide foil tape (Nashua #322 orHardcast AFG 1402 or equivalent) or ductsealer for outdoor application (RCD #6 orequivalent) installed per the manufacturer'sspecifications. If jointed elbows are used;the joints shall be sealed in the samemanner as the collar connection. A rigid 90degree elbow shall be used on new homesmanufactured after January 1, 2002 toconnect the crossover duct to the mainsupply duct collar.

c. Where an extension or elbow is used,the inner liner, shall be cut back leavingsufficient outer liner, insulation, and vaporretarder to cover the extension or elbow.The outer liner, R-8 insulation, and vaporretarder shall cover the extension or elbow(See Figure 803.1), and shall extend upinto the floor insulation and bottom boardand be taped to the bottom board where

the crossover duct enters with approvedbottom board tape.

d. The inner liner, along with the wirehelix, of the crossover duct shall beextended over, and be secured to, the sheetmetal extensions, elbows, or collars with atleast three sheet metal screws placed tosecurely hold the wire helix. Alternatively,a tool tightened plastic cable tie strap("Panduit" strap or equivalent) may beused where a lip on the extension, elbowor collar will prevent the strap fromslipping off. Where screws are used, thetears shall be repaired with foil or Mylartape. The joint shall be sealed withminimum two inch (2") wide foil tape(Nashua #322 or Hardcast AFG 1402 orequivalent) or with a duct sealer rated foroutdoor applications (RCD #6 orequivalent). The tape or sealer shall beinstalled per the manufacturer'sspecifications. The outer liner andinsulation shall be returned back to coverthe inner liner and the extension, elbow, orcollar, and shall be secured in place with amechanical fastener.

e. Adequate clearance shall be maintainedunder the manufactured home for theheating and cooling duct crossovers.Crossover ducts shall be blocked orsuspended above the ground providing oneinch (1") minimum clearance. If blocks areused, they shall be pressure treated wood,concrete, or extruded polystyreneinsulation board.

f. Crossover ducts shall be installed witha minimum of bends and length whichrestrict air flow, shall be adequatelysupported, and not be crushed, dented,compressed, or have sharp bends or stressat the connections. All tears or holes in theinner liner shall be sealed with sealerspecified in Subsection 803.02.d. and the

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WASHER DRYER WASHERDRYER

NOTE:EXHAUST DUCTS SHALLNOT TERMINATE BELOWMANUFACTUREDHOME

4" MIN DIAMETER 25' MAXLENGTH SMOOTH ORFLEXIBLE DRYER DUCT.DIPS OR TRAPS IN THEDUCT RUN SHALL ONLYBE PERMITTED THROUGH ANAPPROVED METHOD. NOSCREWS OR FASTENERSSHALL OBSTRUCT DUCTINTERIOR.

FULL OPENING BACKDRAFT DAMPER

DRYER DUCT INSTALLATIONFIGURE 804.2

FREE STANDINGSELF-SUPPORTINGGARAGE STRUCTURE

MANUFACTUREDHOME AIRCONDITIONER SHALLNOT BE PLACED INSIDEATTACHED GARAGE

MANUFACTURED HOMEAPPLIANCE EXHAUST SHALLNOT TERMINATE INSIDE ANATTACHED GARAGE

MANUFACTURED HOMEUNDERFLOOR VENTSSHALL NOT BE LOCATEDINSIDE AN ATTACHEDGARAGE

MANUFACTURED HOMEAPPLIANCE CONDENSATIONDRAIN SHALL NOTTERMINATE INSIDE ANATTACHED GARAGE

ATTACHED GARAGEMECHANICAL VENTS

FIGURE 804.1

EXHAUST THROUGH WALLEXHAUST THROUGH FLOOR

outer liner shall be repaired with bottomboard sealer.

804. APPLIANCE VENTING.

01. Venting. Appliance venting shall complywith the appliance manufacturer's installationinstructions and the following requirements:

a. Moisture or heat producing appliances,such as dryers, shall be vented to theoutside atmosphere in a manner to ensuremoisture laden air is carried out beyond theperimeter of the home. Listed nonventingappliances are not required to haveexternal vents.

b. Exhaust ducts shall be routed throughthe wall, floor, skirting, or foundation, tothe exterior. Exhaust duct systems ofclothes dryers, ranges, or other appliancesshall not terminate beneath themanufactured home. Exhaust ductinstallations shall, whenever possible haveno dips or traps and shall be installedaccording to the applicable appliancemanufacturer's installation instructions.

c. No inlets or outlets of an exhaust vent,combustion air vent, or return air ventcapable of conveying air, liquid, or gassesinto or out of any appliance shall belocated under the manufactured homewhen it is installed over a basement, or inan area where a garage is to be attached.See Figure 804.1.

02. Dryer Exhaust Vents. Dryer exhaustducts, when required, shall be installedaccording to the dryer manufacturer'sinstallation instructions or as prescribed in thefollowing Subsections. See Figure 804.2.

a. The duct shall be a minimum of fourinches (4") in diameter and no longer thantwenty-five feet (25'). The total length

shall be reduced five feet (5') for eachninety (90) degree turn.

b. The duct material shall be rigid metal,rigid PVC, or flexible metal.

c. Nonmetallic duct or flexible foil ductmaterial shall not be used within three feet(3') of the dryer connection or enclosedwithin a wall or floor cavity;

d. No screws, fasteners, screens, or otherobstructions, shall extend into the duct.

805. -- 899. RESERVED:

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901. GENERAL.

01. Standards. Every manufactured homeaccessory building or structure shall bedesigned and constructed according to theapplicable locally adopted Building Codes andthis standard. Permits must be obtained prior toconstruction.

902. UNDERFLOOR ENCLOSURES.

01. Requirement. Each manufactured homeshall have the underfloor crawl space entirelyenclosed with a permanent foundation orapproved skirting material. The permanentfoundation or skirting material shall be installedat the time the home is set.

02. Skirting. Skirting shall conform with therequirements in the following Subsections. SeeFigures 902.1 and 902.2.

a. Skirting shall be constructed of adurable rigid material such as vinyl, wood,aluminum, or steel, and shall be suitable forexterior exposure. Untreated wood shallnot be utilized within six inches (6") of anyearthen material.

b. Skirting shall be installed according tothe skirting manufacturer's installationinstructions and this subsection.

c. Skirting shall be adequately secured toassure stability, to minimize vibration, andto minimize susceptibility to wind damage.

d. Skirting shall be installed tocompensate for possible frost heave.

e. Holes or gaps between the skirting andthe ground, or any other gap anywherearound the skirting that could permit

rodents to get under the home, shall besealed or back filled.

f. Skirting shall not be attached to amanufactured home in a manner which willpermit water to be trapped between theskirting and the siding or between theskirting and the trim of the manufacturedhome.

g. All framing used to secure skirtingmaterial and located within six inches (6")of earth shall be pressure treated lumber.

h. Deck, porch, or landing floors whichare not insulated and which allow for thefree flow of air and moisture through themshall be separated from the underfloor areaof a manufactured home by skirting, afoundation, or a durable flexible materialsuch as sheet vinyl, Plexiglas, Fiberglass,ABS, or EPDM. The area below an openfloor may be enclosed with lattice work,skirting, or a foundation wall if madeaccessible according to Section 904 of thisstandard. See Figure 902.2. SeeSubsection 302.06.f. for vapor retarderinstallation at this location. Vents shall beinstalled as prescribed in Section 903.

03. Perimeter Foundations. Perimeterpermanent foundation walls of wood, concrete,or concrete block supporting the exterior wallsof the manufactured home shall be designedand constructed according to Section 305.

903. UNDERFLOOR VENTILATION.

01. Requirement. All manufactured homesshall be provided with underfloor ventilationmeeting the requirements prescribed in thefollowing Subsections.

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18" X 24" UNDERFLOORACCESS

TYPICAL SKIRTING VENTS

TYPICAL PERIMETERBLOCKING

TYPICAL FRAMEBLOCKING

TYPICAL SKIRTINGSUPPORTS

TYPICAL SKIRTING

BOTTOM TRIM

PERIMETER WALLS

UNDERFLOOR ENCLOSUREREQUIRED

MEMBRANE SHEETING (VAPORBARRIER) IS NOT PERMITTEDON THE GROUND UNDEROPEN FLOOR(SEE SECTION 302.06.f)

IF DECK, FLOOR, OR LANDING IS OVER 30 INCHESABOVE FINISHED GRADE, GUARD RAILS SHALL BE INSTALLED(SEE SECTION 910.03)

NOTE:PERIMETER PIERS AND TIE DOWNSUNDER THE RECESSED PORCHARE NOT SHOWNFOR CLARITYONLY

PERIMETER WALLS

UNDERFLOOR VENTILATION(SEE SECTION 903)

UNDERFLOOR ENCLOSURE

FLOOR OPEN TO GROUNDBELOW

LATTICE SKIRTING PERMITTEDAROUND OPEN FLOOR ONLY

ACCESS REQUIRED TO AREAUNDER A RECESSED PORCH

UNDERFLOOR ENCLOSURESFIGURE 902.1

TYPICAL RECESSED PORCH DETAILFIGURE 902.2

a. A minimum of eight ventilationopenings shall be provided from theunderfloor space to the exterior.

b. A ventilation opening shall be placedthree feet (3') from each corner, or as nearto three feet (3') from each corner aspractical. Vents shall not be spaced morethan twenty feet (20') apart. Vents shall beplaced as high as practical.

c. The total net free area for ventilationshall be one square foot for every threehundred (300) square feet of underfloorarea.

d. Ventilation openings shall provideventilation on at least three sides of themanufactured home.

e. Ventilation openings shall be providedwith one-quarter inch (1/4") corrosionresistant wire mesh or with louveredopenings with not less than one-eighth inch(1/8") screen to retard the entry ofvegetation, waste materials, and rodents.

f. When a vent label does not include arating of the net free area, the free areamay be calculated by deducting twenty-fivepercent (25%) from the gross ventilationarea. This calculation adjusts for blockagecaused by vent hardware such as screensand louvers. The gross vent area iscalculated by the length times height of theopening through the vent.

g. Intake air for indoor ventilationpurposes, except for combustion air, shallnot be drawn from underfloor spaces ofthe manufactured home.

h. When combustion air for heatproducing appliances is taken from theunderfloor area, ventilation shall beadequate to assure proper operation of the

appliances. No increase in the minimumunderfloor ventilation is necessary.

i. When a manufactured home is placedover a basement and the combustion air forheat producing appliances is designed to betaken from the underfloor area, thecombustion air inlets shall be ducted to theoutside of the basement area.

904. UNDERFLOOR ACCESS.

01. Requirement. All manufactured homesshall be provided with an access to theunderfloor area through one of the methodsdescribed in this section.

02. Skirting Access. Underfloor accessthrough the skirting shall:

a. Have a minimum clear opening ofeighteen inches high by twenty-four incheswide (18"x24");

b. Require no tools, no more than five (5)pounds of force, nor the operation of morethan four devices, to open;

c. Be easily identifiable;

d. Have a minimum thirty inch (30") clearspace directly in front, outside theperimeter of the home, of each accesspanel or door.

03. Foundations and Ground Level Access.Ground level installations shall be providedwith an access well which shall conform to thefollowing requirements.

a. The access well shall have a minimuminside dimension of twenty-four inches(24") high by thirty-six inches (36") wide,and extend at least twenty-four inches(24") from the perimeter of the home.

b. The access well shall have a minimumclear opening of eighteen inches high by

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twenty-four inches wide (18"x24") to theunderside of the home.

c. The access well shall have alightweight removable watertight covermade to resist the entrance of animals orwater. The cover shall be designed andinstalled so that it cannot be locked. Thecover shall be designed and installed sothat it can be easily opened without usingany tools.

04. Floor Access. Access openings throughthe floor of a manufactured home shall beprovided only by the manufacturer andconstructed according to approved DesignApproval Primary Inspection Agency (DAPIA)plans. For other approvals see Subsection 201.02.

05. Stairway Access. Access openingsthrough the manufactured home floor forstairways shall be provided only by themanufacturer and constructed according toapproved DAPIA plans. For other approvalssee Subsection 201.02.

905. CARPORTS & AWNINGS.

01. Accessories. Permanent awnings orcarports shall be erected or constructed on amanufactured home site only as an accessory toa manufactured home located on the same site.This section of the standard does not apply totemporary, flexible, or fabric awnings andcarports, nor to fixed window awnings usedwith manufactured homes.

02. Site Built. Permanent or rigid awnings orcarports shall be constructed, supported,attached, and anchored according to locallyadopted building codes and this standard.

03. Prefabricated. Approved prefabricatedawnings and carports shall be installed,attached to the manufactured home andanchored into the ground according to methods

prescribed in the awning or carportmanufacturer's installation instructions.

04. Windows and Doors. Manufactured homewindows and doors may open directly into aspace occupied by a permanent or rigid awningor carport.

05. Enclosure. Permanent awnings or carportsshall not be enclosed with rigid materials orwalls or converted for use as a habitable roomor garage unless the completed constructioncomplies with all the requirements of the localcodes and this standard. Enclosing the awningor carport shall not take the manufacturedhome out of conformance with any state orfederal manufactured home regulation.

a. Exception: Awnings may be enclosedwith insect screening if required egresspaths are not blocked. See Section 909.

06. Wall Support. When a prefabricatedawning or carport is attached to and supportedby the wall of a standard set manufacturedhome, supports complying with Section 304 ofthis standard shall be placed under the exteriorwall. The supports shall be spaced a maximumof four feet (4') on center under the area ofattachment. A perimeter support foundationmeets this requirement.

07. Wall Attachment. A site built permanentawning or carport may be attached to anexterior wall of a manufactured home toimprove its stability. In that case the awning orcarport shall be supported by a horizontal rail aminimum of two inches by six inches (2" x 6")nominal size attached with a minimum of two(2) three and one-half inch (3 1/2") long (16d)nails or equal having a minimum one andone-half inch (1-1/2") penetration into eachexterior wall stud in the area of attachment.Under no condition shall horizontal rails besecured into or supported by the manufacturedhome exterior wall top plates. Additional


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support posts shall be added under thishorizontal rail to assure the carport or awningis self supporting. See Figure 905.1.

08. Roof Support. A prefabricated awning orcarport may only be attached to manufacturedhome roof trusses, eaves, or fascia, accordingto engineered DAPIA approved plansdemonstrating the manufactured home roofwas engineered and constructed to carry theadditional loads. DAPIA approved plans shallbe made available to the authority havingjurisdiction before the installer or homeownerwill be permitted to attach an awning or carportto a manufactured home truss, eaves, or fascia.

906. PORCHES.

01. Accessory. A porch may be installed orconstructed on a manufactured home site onlyas an accessory to a manufactured home on thesame site.

02. Self Supportive. A porch shall bedesigned and constructed as a self supportingstructure but may be attached to amanufactured home to provide a weather seal.See Figure 906.1. If both the home and theporch are on a permanent foundation, the roofmay be attached to the home per Subsection 905.07.

03. Code. Porches shall be designed andconstructed to the requirements of the locallyadopted building code.

907. ATTACHED GARAGES.

01. Accessory. An attached garage shall beconstructed on a manufactured home site onlyas an accessory to a manufactured home on thesame site.

02. Self Supportive. A garage attached to astandard set manufactured home shall bedesigned and constructed as a freestanding, selfsupporting structure and may only be attached

to a manufactured home to provide a weatherseal. If both the home and garage are on apermanent foundation, the garage may beattached to the home but must remain selfsupporting. A dormer may be constructed tothe manufactured home roof to provide thisattachment. See Figure 907.1.

03. Code. Attached garages shall be designedand constructed according to locally adoptedbuilding codes and this section.

04. Separation. Attached garages shall beseparated from the manufactured homeaccording to the requirements prescribed in thefollowing Subsections. See Figure 907.1.

a. No opening shall be permitted from agarage directly into a room used forsleeping purposes. No windows shall bepermitted in the exterior wall of amanufactured home where a garage is tobe attached. Any opening between thegarage and manufactured home shall beequipped with a twenty (20) minute firerated door of solid wood not less than oneand three-eighths inches (1-3/8") inthickness, or the equivalent;

b. The garage shall be completelyseparated from the manufactured home,including attic and crawl space areas, witha minimum five-eighths inch (5/8") firerated gypsum board or its equivalent;

c. Exhaust vent, combustion air vent,return air vent, condensation drain, or anyother vent or opening capable ofconveying air, moisture, liquid, or gassesinto or out of the manufactured home, orto or from any appliance used inconjunction with the manufactured home,shall not be located in an area where agarage is intended to be attached.


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70

REQUIRED EXIT DOOR

WALL STUD

(2) 16d NAILS W/ MIN 1 1/2"PENETRATION

INTO EACH WALL STUD

TYPICAL MANUFACTURED TRUSS

4X4 POST TO FOOTINGSPACE AS PER LOCAL CODE

CARPORT CONNECTIONFIGURE 905.1

PORCH INSTALLATIONFIGURE 906.1

ALTERNATIVE: REMOVE FASCIA BOARDAND NOTCH AND SECURERAFTER ONTO TOP OF RAIL

RAFTER ATTACHED TO RAILWITH JOIST HANGERS

MIN 2X6 RAIL NAILEDINTO EACH STUD


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18" MIN

MIN 28 SQUARE INCH VENT EVERY10'-0" THE LENGTH OF THERAMADA ROOF

24" MIN

36" MIN

6" MIN

FREE STANDINGSELF-SUPPORTINGGARAGE STRUCTURE

ADDITIONALEXIT DOORREQUIRED

RAMADA ROOF PERLOCAL CODE

ATTACHED GARAGEFIGURE 907.1

RAMADA INSTALLATIONFIGURE 908.1

SOLID FUEL BURNINGAPPLIANCE FLUE

PLUMBING VENT TO EXTEND6" ABOVE THE RAMADA ROOF

DOOR BETWEEN MANUFACTUREDHOME AND ATTACHED GARAGESHALL BE 1 3/8" THICK AND HAVEA 20 MINUTE FIRE RATING

VENTILATION OPENINGS ARE NOT PERMITTEDINTO THE MANUFACTURED HOME FROM THEATTACHED GARAGEWINDOWS ARE NOT PERMITTEDBETWEEN THE MANUFACTUREDHOME AND THE ATTACHEDGARAGE 5/8" FIRE RATED GYPSUM

BOARD BETWEEN THEMFG HOME AND THEATTACHED GARAGE

908. RAMADAS.

01. Accessory. A ramada shall be erected,constructed or maintained on a manufacturedhome site only as an accessory to amanufactured home located on the same site.

02. Clearance. A ramada or any portionthereof shall have a clearance of not less thaneighteen inches (18") in a vertical directionabove the highest portion of a manufacturedhome roof and not less than six inches (6") in ahorizontal direction from each side of amanufactured home. See Figure 908.1.

03. Self Supportive. A ramada shall bedesigned and constructed as a freestanding, selfsupporting structure meeting the requirementsof the locally adopted building code.

04. Enclosures. A ramada shall not be whollyenclosed on any side or end. Gable ends mustbe vented if they are enclosed.

05. Chimneys and Flues. Manufactured homechimneys, flues and vents shall be extendedthrough the ramada roof as prescribed in thefollowing Subsections. See Figure 908.1.

a. Chimneys or flues from solid fuelburning appliances shall extend at leastthree feet (3') above the part of the ramadaroof through which it passes and at leasttwo feet (2') above the highest elevation ofany part of the ramada roof within ten feet(10') horizontal of the chimney.

b. Vents for fuel burning appliances shallextend through the ramada roof accordingto the listing of the appliance.

c. Plumbing vents shall extend throughthe ramada roof a minimum of six inches(6") above the flashing. Plumbing ventsshall not be located within three feet (3') ofany motor driven air intake that opens intohabitable rooms.

06. Egress and Exit. Egress doors andwindows may exit out of a manufactured homecovered by a ramada provided there are noobstructions in the path of egress to the areaoutside the ramada.

909. ACCESS & EGRESS.

01. Requirement. There shall be a minimumof two exit doors in each manufactured home.Each bedroom shall have one emergency egresswindow providing access to the outside.

02. Obstructions. Accessory buildings orstructures shall not obstruct a required exit,egress window, appliance access, or utilityaccess except where specifically permitted inthis standard. No hinged exterior egress doorshall be prevented from opening at least 90degrees. Door locks or other obstructionswhich would obstruct the path of egress from amanufactured home shall not be installed nor bepermitted to remain

03. Enclosed Exit Doors. When an accessorybuilding or structure, other than an awning orcarport, encloses an exit door of themanufactured home so that it no longerprovides egress to the outside an additional exitdoor, opening to the outside, shall be installedin either the manufactured home (SeeSubsection 201.02) or the accessory buildingor structure. This new door must be located inclose proximity to the original door.

04. Original Exit Door. One of the originalmanufactured home exit doors must opendirectly to the outside without passing throughan accessory building or structure.

a. Exception: Egress may open directlyinto and pass through a carport asdescribed in Section 905 of this standard.


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05. Prohibited Construction. No accessorybuilding or structure shall be constructed whichobstructs any required means of egress from amanufactured home.

910. DECKS, PORCHES, LANDINGS,STAIRS, RAMPS & GUARDRAILS.

01. Construction Standard. Every porch,deck, landing, stair, ramp, guard rail, orguardrail erected, constructed, or maintainedadjacent to a manufactured home shall complywith the locally adopted building code.

02. Attachment to Manufactured Home.When a deck, landing, ramp, or stairs isattached to the wall of a conventionally setmanufactured home, supports complying withSection 304 of this standard shall be placedunder the exterior wall at a maximum spacingof four feet (4') on center under the full lengthof the area of attachment.

03. Required Installations. If during theinstallation of a manufactured home, a porch,deck, or landing (recessed porch) constructedby the manufactured home manufacturer is overthirty inches (30") above the finished grade, itshall have guardrails installed conforming to thelocally adopted building code.

911. -- 999. RESERVED.


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1001. GENERAL.

01. Listing Requirement. All fuel burningappliances and equipment shall be listed fortheir intended use, and all solid fuel burningappliances and equipment shall be listed formanufactured home or mobile home use.

02. Installation Instructions. Installationinstructions shall be provided with each heatproducing appliance and made available to theauthority having jurisdiction during inspections.

03. Derating Appliances. All gas and oil fuelburning appliances and equipment in homesthat are installed at an elevation greater thantwo thousand feet (2000') above sea level shallbe derated according to the utility companyrequirements and appliance and equipmentmanufacturer's specifications. All requiredadjustments and modifications shall beperformed by authorized service technicianswho shall provide documentation of thederating to the inspecting authority.

04. Accessibility. All fuel burning appliancesshall be accessible for inspection, service,repair, or replacement without removingpermanent construction.

05. Clearance. Flue gas outlets and exhaustvents shall terminate not less than three feet (3')distant from any motor driven air intakedischarging into habitable areas.

06. Other Appliances. Heat producingappliances not specifically mentioned in thisstandard shall, at a minimum, be listed andapproved for use in manufactured homes andshall be installed according to the listing andthe appliance manufacturer's installationinstructions.

07. Operating Instructions. Operatinginstructions shall be provided to thehomeowner with each heat producing applianceinstalled.

1002. RANGES & DRYERS.

01. Listed Standards. Fuel burning cookingrange and clothes dryer appliances shall belisted for their intended use. Replacement fuelburning range and dryer appliances are notrequired, but are recommended, to be listed formanufactured home or mobile home use.However, they must be, at a minimum, installedaccording to their listings and the appliancemanufacturer's installation instructions. Electriccooking range and clothes dryer appliancesshall be listed for manufactured home or mobilehome use or shall be manufactured so that theneutral conductor is insulated from thegrounding conductor and the equipmentenclosure.

02. Clearances. Ranges shall be installed sothat there is a minimum vertical clearance oftwenty-four inches (24") above the cookingtop.

03. Dryer Exhaust. Dryer appliances shallexhaust directly to the outside of themanufactured home and shall not terminatebeneath manufactured homes nor into anyconfined space. Listed nonventing dryers arenot required to have an external vent.

04. Range Exhaust Vents. Range andcook-top appliances equipped with integralexhaust vents shall exhaust directly to theoutside of the manufactured home according, ata minimum, to the appliance manufacturer'sinstallation instructions, and shall not terminate

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beneath the manufactured home or in aconfined space.

1003. FURNACES, GAS STOVES, WATERHEATERS, & GAS FIREPLACES.

01. Appliance Listing. Fuel (gas or oil)burning and electric furnace and water heaterappliances shall be listed for their intended use.Replacement fuel burning and electric furnaceor water heater appliances are not required (butare recommended) to be listed formanufactured home or mobile home use butmust, at a minimum, be installed according totheir listings, the appliance manufacturer'sinstallation instructions, and this section of thisstandard.

02. Installation. Fuel (gas or oil) burningfurnaces, stoves, fireplaces, and water heaterappliances shall be installed to provide for thecomplete separation of the combustion systemfrom the interior atmosphere of themanufactured home. See Figure 1004.1. Thisseparation shall be accomplished by one or bothof the following two methods.

a. Install a direct vent system (sealedcombustion system) listed or certified ascomponents of the appliance.

b. Install the appliance within anenclosure accessible only from outside themanufactured home so as to separate theappliance combustion and venting systemsfrom the interior atmosphere of themanufactured home. There shall not be anydoor, removable access panel, or otheropening into the enclosure from the insideof the manufactured home. Any openingsor penetrations for ducts, return air inlets,piping, or wiring shall be sealed.

03. Combustion Air. Combustion air shall notbe taken from within any wall cavity, floorcavity, or ceiling cavity, or from a basementarea. Combustion air may be taken from a

ventilated crawl space below the manufacturedhome.

04. Flue Listing. Flue gas outlets shall belisted or certified as components of theappliance and installed, at a minimum,according to the listing and the appliancemanufacturer's installation instructions.

05. Appliance Compartment. All furnace andwater heater appliance compartments shall havethe interior walls, door and ceiling lined withminimum three-eighths inch (3/8") thickgypsum board or equivalent material having amaximum flame spread rating of twenty-five(25).

06. Securement. All furnace and water heaterappliances shall be secured in place to preventmovement.

1004. SOLID FUEL BURNINGFIREPLACES & STOVES.

01. Listing Standard. Solid fuel burningfactory built fireplaces and stoves listed for usein manufactured homes or mobile homes maybe installed in manufactured homes providedtheir installation conforms with this standard.

02. Minimum Stove ConstructionRequirements. Solid fuel burning fireplacesand stoves shall:

a. Be constructed to the Department ofHousing and Urban DevelopmentManufactured Home Construction andSafety Standards 24 CFR 3280.709;

b. Be equipped with integral door(s) orshutters designed to close the fireplace orstove fire chamber opening;

c. Be equipped with a combustion airinlet designed to conduct air directly intothe fire chamber and prevent material fromthe hearth dropping onto the area beneaththe manufactured home;

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d. Have a complete means for ventingthrough the roof;

e. Have a hearth extension; and

f. Have a means to secure the fireplace orstove to the floor.

03. Labeling. The label on each solid fuelburning fireplace and stove shall include thefollowing wording, "For use with solid fuelonly" and "Approved for manufactured homeuse" or "Listed for manufactured home use,"and contain the name of the manufacturer andlisting agency, the model number, serialnumber, and listing number.

04. Installation. Installation of solid fuelburning fireplaces and stoves shall, at aminimum, conform to the terms of their listings,the fireplace or stove manufacturer's installationinstructions, and the requirements prescribed inthe following Subsections. See Figure 1004.1.

a. A listed factory-built chimney designedto be attached directly to the fireplace orstove shall be used. The chimney shall beequipped with, and contain as part of itslisting, a termination device and sparkarrestor.

b. The fireplace or stove air intakeassembly, hearth extension, and chimneyshall, at a minimum, be installed accordingto the terms of their listings and thefireplace or stove manufacturer'sinstallation instructions.

c. The combustion air inlet shall conductair directly into the fire chamber and beinstalled to prevent material from thehearth dropping onto the area beneath themanufactured home.

d. The fireplace or stove shall not beinstalled in a sleeping room.

e. A hearth extension shall be constructedof noncombustible material not less thanthree-eighths inch (3/8") thick.

f. The hearth shall extend at least sixteeninches (16") in front of, and at least eightinches (8") beyond each side of, thefireplace or stove opening and cover theentire surface beneath a stove or beneathan elevated or overhanging fireplace.

g. Fireplaces and stoves shall be securedin place to prevent displacement.

h. The chimney shall extend at least threefeet (3') above that part of the roofthrough which it passes and at least twofeet (2') above the highest elevation of anypart of the manufactured home structurewithin ten feet (10') of the chimney. If aramada is installed the chimney mustconform to the requirements prescribed inSubsection 908.05.

i. Portions of the chimney flue, sparkarrestor, and rain cap, shipped-loose fortransportation purposes, shall, at aminimum, be installed on-site to thefireplace or stove manufacturer'sinstallation instructions during theinstallation of the manufactured home.

j. Heat shields used with fireplaces orstoves shall have a minimum one inch (1")air space between the heat shield and anywall surface.

k. Fireplaces and stoves shall not beinstalled in alcoves unless specifically listedfor use within alcoves.

l. Fireplaces and stoves shall be locatedso that no doors, drapes, or other suchmaterial can be placed, or swing closer, tothe appliance than the clearances specifiedon the appliance label.

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78

NOTE:

4'-0" MIN BELOW WINDOW

1' MIN ABOVE GRAVITY VENT

7'-0" ABOVE GRADEWHEN ADJACENT TOPUBLIC WALKWAY

4'-0" MINHORIZONTALTO WINDOW

COMBUSTIONAIR INLET

GRADE

CEILING COLLAR

LISTED FLUE PIPEHEAT SHIELD IF USED SHALL HAVE AMIN 1" AIR SPACE BETWEEN SHIELDAND WALL SURFACE

WOOD STOVE INSTALLED ACCORDING TOTERMS OF ITS LISTING & ACCORDINGTO THE STOVE MANUFACURER'SINSTRUCTIONS

COMBUSTION AIR INLETBELOW BOTTOM BOARD

RAIN CAP

SPARK ARRESTOR

LISTED CHIMNEY

RAIN COLLAR

10'-0"

24" MIN AT 10' HORIZ OF ROOF

NOTE:

36" MIN AT PENETRATION

SUPPORTCOLLAR

HORIZONTAL VENTS SHALLBE LOCATED NOT LESSTHAN 2 FEET FROM ANADJACENT BUILDING,NOT LESS THAN 1 FOOTABOVE ANY DOOR ORWINDOW, AND NOT LESSTHAN 7 FEET ABOVEGRADE WHEN LOCATEDADJACENT TO PUBLICWALKWAYS.

3/8" MIN THICKHEARTH 16" INFRONT OF DOOROPENING AND8" EITHER SIDEOF DOOR OPENING.

WOOD STOVE INSTALLATIONFIGURE 1004.1

SIDEWALL VENTILATION TERMINATIONFIGURE 1005.1

FIREPLACES AND WOODSTOVES SHALL BESECURED TO THEFLOOR

m. Clearances surrounding fireplaces andstoves shall not be less than the clearancesspecified in the terms of the listing; and

n. Combustion air shall not be taken fromwithin any wall cavity, floor cavity, orceiling cavity, or from any basement area.

1005. PELLET FIRED APPLIANCES.

01. Installations. Pellet-fired appliances maybe installed in manufactured homes providedsuch appliances and the installations conform tothe following requirements.

a. Pellet-fired appliances shall not besubstituted for the required heating facility.

b. The installation of each appliance shall,at a minimum, conform to the terms of itslisting, the appliance manufacturer'sinstallation instructions, and this standard.

c. Each appliance shall be secured inplace to prevent displacement.

d. Each appliance shall be accessible andremovable for purposes of servicing andreplacement.

e. Pellet-fired appliances shall be locatedso that no doors, drapes, or other suchmaterial can be placed, or swing closer to,the appliance than the clearances specifiedon the appliance label.

f. Clearances surrounding pellet-firedappliances shall not be less than theclearances specified in the terms of theirlistings.

g. Pellet-fired appliance air intakeassemblies, hearth extensions, and exhaustvents shall, at a minimum, be installedaccording to the terms of their listings, andthe appliance manufacturer's instructions.

h. Combustion air shall not be taken fromwithin any wall cavity, floor cavity, orceiling cavity, or from a basement area.

i. Pellet-fired appliances shall not beinstalled in a sleeping room.

j. Hearth extensions, when required bythe appliance listing, shall be ofnoncombustible material constructed, at aminimum, to the specifications included inthe appliance listing and the appliancemanufacturer's instructions.

k. Horizontal exhaust vents shall, at aminimum, be installed to conform to theterms of the appliance listing and theappliance manufacturer's instructions.Horizontal exhaust vent terminations shallbe located not less than four feet (4')below, four feet (4') horizontally from, orone foot (1') above any window or gravityair inlet into any building, and not less than2 feet from an adjacent building.Horizontal exhaust vents shall be installednot less than seven feet (7') above gradewhen located adjacent to public walkways.See Figure 1005.1.

l. Vertical exhaust vents shall extend atleast three feet (3') above the part of theroof through which they pass, and at leasttwo feet (2') above the highest elevationsof any part of the manufactured homewithin ten feet (10') horizontally of theexhaust vent. See Figure 1004.1. If aramada is installed the vents must conformto the requirements prescribed inSubsection 908.05.

m. Portions of the exhaust vent andtermination, shipped loose fortransportation purposes, shall, at aminimum, be installed on-site according tothe appliance manufacturer's installation

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instructions during the installation of themanufactured home.

n. Every pellet fired appliance shall beaccessible for inspection, service, repair, orreplacement without removing permanentconstruction. Sufficient room shall beavailable to enable the operator to observethe burner, control, and means of ignitionwhile starting the appliance.

1006. -- 1099. RESERVED.


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01. Accessible. Having access thereto, butwhich may require removal of an access panelor opening of a door.

02. Accessory Building or Structure. Anypermanent structure established for use of theoccupant of the manufactured home and asfurther defined by rule by the Division.

a. Accessory Building. An accessorybuilding including, but not limited to,ramadas, storage sheds, and garages.

b. Accessory Structures. An accessorystructure including, but not limited to,awnings, carports, decks, steps, and ramps.

03. Alteration. Any change, addition, repair,conversion, replacement, modification, orremoval of, any equipment or installation whichmay affect the operation, construction, oroccupancy of a manufactured structure.Alteration does not mean:

a. Minor repairs with approvedcomponent parts;

b. Conversion of listed fuel burningappliances according to the terms of theirlisting ; or

c. Adjustment and maintenance ofequipment, or replacement of equipment oraccessories in kind.

04. Approved. Approved, licensed, orcertified by the Division of Building Safety orits designee.

05. Attached Garage. A garage which isjoined to a manufactured home but is self-supporting and separated with fire-resistiveconstruction.

06. Authority Having Jurisdiction. The localgovernment which inspects and issues permitsfor installation, alteration, or conversion of

manufactured homes, equipment, accessorybuildings and structures.

07. Awning. Any stationary structure,permanent or removable, used in conjunctionwith a manufactured home for the purpose ofproviding shelter and having a roof withsupports and not more than one wall. Windowawnings are excluded from this definition.

08. Base Flood. Defined by FEMA in 44 CFRChapter 1 as the flood level that has a onepercent (1%) probability of being equaled orexceeded in any given year.

09. Building Drain. That part of the lowestpiping of a drainage system which receives thedischarge from soil, waste, and other drainagepipes inside the walls of the manufacturedhome and conveys it to the building sewer.

10. Building Sewer. That part of thehorizontal piping of a drainage system whichextends from the end of the building drain andwhich receives the discharge of the buildingdrain and conveys it to a public sewer, privatesewer, individual sewage disposal system, orother point of disposal.

11. Building Supply. The pipe carryingpotable water from the water meter or othersource of water supply to a building or otherpoint of use or distribution on the lot. Buildingsupply shall also mean water service.

12. Carport. A stationary structure consistingof a roof with its supports and not more thanone wall used for sheltering a motor vehicle.

13. Chassis. The entire transportation systemof a manufactured home.

14. Clearance. The distance between twoadjacent surfaces.

DEFINITIONS

81

15. Concealed. Rendered inaccessible by thestructure or finish of the manufactured home.

16. Controlled Fill. Fill shall be engineered tobear a minimum one thousand five hundredpounds per square foot (1,500 psf) structuralload in which the fill material is placed in layersof soil, crushed stone, or masonry wastematerial, compacted, and tested to ensure thatit meets specified compaction standardsdetermined by laboratory test of soil samplesfrom the fill material.

17. Division. The State of Idaho Division ofBuilding Safety.

18. Drain. A pipe that carries waste, water, orwaterborne waste in a drainage system.

19. Dwelling Unit. One or more habitablerooms which are designed to be occupied byone family with facilities for living, sleeping,cooking, and eating.

20. Equipment. Materials, appliances,subassembly, devices, fixtures, fittings, andapparatuses used in the construction, plumbing,mechanical, and electrical systems of amanufactured structure.

21. Feeder Assembly. The overhead orunder-chassis feeder conductors, including thegrounding conductor, together with thenecessary fittings and equipment, or a powersupply cord approved for manufactured homeuse, designed for the purpose of deliveringenergy from the source of electrical supply tothe distribution panel board within themanufactured home.

22. Footing. That portion of the supportsystem that transmits loads directly to the soil.

23. Foundation System. A perimeter footingand stem wall support system.

24. Foundation Set. A manufactured homeinstalled on footings and piers and which hasthe perimeter enclosed with a supporting

permanent foundation footing and stem wallextending below the frost line.

25. Frame. The fabricated rigid substructurewhich provides considerable support to theaffixed manufactured home structure bothduring transport and on-site. It also provides aplatform for attaching the running gearassembly, the draw bar, and couplingmechanism to the home.

26. Garage. A structure located on amanufactured home site designed for thestorage of motor vehicles.

27. Gas Supply. A listed connector designedfor connecting the manufactured home to thegas supply source.

28. Grade. The fall (slope) in reference to ahorizontal plane expressed in inches per footlength or as a percentage. One hundred percentgrade equals twelve inches fall in one footlength.

29. Grounded. Connected to earth or to someconducting body that serves in place of theearth.

30. Ground Anchor. Any device at amanufactured home site designed to transfermanufactured home anchoring load to theground.

31. Ground Level Installation. Amanufactured home with a below-gradefoundation system and a perimeter retainingwall or foundation which has earth back filledagainst it.

32. Installation. In relation to:

a. Construction. Work performed insidethe home after it leaves the factory andwhich affects the arrangements andmethods of construction of the home, thefire and life safety aspects of the home, and

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the electrical, plumbing, and mechanicalequipment and systems of the home.

b. Siting. Work performed outside thehome to place it on its site. This includeswork associated with the manufacturedhome support and tie-down system,structural work, work associated with thefire and life safety aspects of the home, work associated with electrical, plumbing,and mechanical equipment, work to makeup utility connections, and the work toinstall skirting and steps.

33. Installer. Any individual licensed to install,set up, block, tie down, secure, support, orinstall skirting to manufactured homes.

34. Labeled. Equipment or materials used inthe manufacture or installation of amanufactured home, to which has beenattached a label, symbol, or other identifyingmark of a nationally recognized testinglaboratory, inspection agency, or otherorganization which evaluates products tonationally recognized standards andperiodically inspects production of equipmentand materials to show compliance with thosestandards for usage in a specified manner.

35. Listing Agency. An agency that:

a. Is regularly engaged in conducting itsown tests, listing, labeling, or contractingits testing procedures to a nationallyrecognized testing agency;

b. Maintains a periodic inspectionprogram on production of currently listedproducts; and

c. Publishes, at a minimum, an annualreport which is used to determine whetherproducts have been tested to such nationalstandards and found safe for use in aspecified manner.

36. Load Bearing Device. Any equipment ordevice used in the support of manufacturedhome including but not limited to footings,piers, caps, and shims.

37. Maintenance of Equipment. Performingroutine tasks such as lubricating or changingfilters, washers, fuses, or bulbs as necessary forthe continued operation of the equipment butdoes not include the replacement, conversion,alteration, or addition of any equipment.

38. Manufactured Home. A manufacturedhome or mobile home.

39. Manufacturer's Representative. Anemployee, dealer, or person authorized by amanufacturer through contract to act on behalfof the manufacturer.

40. Minor Repair. A simple repair such asreplacing broken glass, fittings, devices, orfixtures, using approved component parts. Thisdoes not include the repair, replacement, conversion, alteration, or addition to, of majorportions of the structural, plumbing, electrical,or mechanical systems of the manufacturedhome.

41. Model. An individual manufactured homeas designated by the manufacturer, intended tobe manufactured with a specific floor plan,structural components, and the type, location,and installation of plumbing, mechanical, andelectrical equipment according to the planssubmitted to the Design Approval PrimaryInspection Authority.

42. Municipality. A city, county, or other unitof local government otherwise authorized bylaw to enact codes.

43. Noncompliance. A failure of amanufactured home, alteration, or installationto comply with an appropriate building code orstandard.

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44. Option. A provision made during themanufacture of a home to facilitate the futureinstallation of any appliance other equipment(e.g., air conditioner, wet bar, or dishwasher).

45. Pier. That portion of the support systembetween the footing and the manufacturedhome.

46. Porch. A stationary structure which maybe constructed with two (2) or more walls,used adjacent to, and in conjunction with, amanufactured home to provide additionalspace.

47. Prefabricated Pier. A listed or approvedpier which is manufactured at an off sitelocation but does not include concrete blocks.

48. Ramada. A stationary structure have aroof extending over a manufactured homewhich may also extend over a patio or parkingspace for motor vehicles, and is used principallyfor protection from snow, sun, or rain.

49. Recessed Porch. An open floor areasupported by the main frame which is locatedoutside the exterior walls of the manufacturedhome.

50. Readily Accessible. Direct access withoutthe necessity of removing any panel, door, orsimilar obstruction.

51. Repair. The reconstruction or renewal ofany part of an existing manufactured home orpiece of equipment for the purpose of itsmaintenance (See alteration).

52. Replacement In Kind. Replacingequipment or accessories with approved likeequipment or accessories, such as switches,thermostats, fittings, elements, or motors, butdoes not include the replacement of majorportions of the structural, plumbing, electrical,or mechanical system.

53. Service Equipment, ManufacturedHome. The equipment for connecting amanufactured home feeder assembly.

54. Set Up. See the definition of installation.

55. Site, Manufactured Home. A designatedparcel of land designed to accommodate amanufactured home, its accessory structures orbuildings, and accessory equipment for theexclusive use of the occupants.

56. Skirting. A weather resistant materialused to enclose the space below themanufactured home.

57. Stabilizing Devices. All components ofthe anchoring system and support systems suchas piers, footings, foundations, ties, anchoringequipment, ground anchors, and any otherequipment which supports the manufacturedhome and secures it to the ground.

58. Standard Set. A manufactured homeinstalled on footings and piers which has aperimeter enclosed by an above ground skirtingor fascia.

59. Support System. A combination offoundations, footings, piers, caps, and shimsthat will, when properly installed, support theweight of the manufactured home.

60. Tag. A label or insignia issued by theDivision and applied to manufactured homes toindicate compliance with federal or state laws,rules, and regulations.

61. Testing Laboratory or Testing Agency.An organization:

a. In the business of testing equipmentand systems;

b. Qualified and equipped to perform orto observe experimental testing toapproved standards;


84

c. Not under the jurisdiction or control ofany single manufacturer or supplier for anaffected industry;

d. Which publishes reports includingspecified information about the equipmentand systems tested and found safe for usein a specified manner; and

e. Whose methods and standards havebeen approved by the Division.

62. Tie. Straps or securing devices used toconnect the manufactured home to tie-downanchors.

63. Tie-down. Any device designed to anchora manufactured home securely to the earth.

64. Utilities. The water, sewer, gas, or electricservices provided on a lot for a manufacturedhome.

65. Utility Connection. Includes, but is notlimited to, the following:

a. Installation and connection of themanufactured home electrical feeders tothe electric utility;

b. Installation and connection of themanufactured home drain to the sewerutility;

c. Installation and connection to themanufactured home water system to thewater utility;

d. Installation and connection of themanufactured home fuel gas system to thegas utility.

66. Vertical Tie. A tie intended to resist theuplifting or overturning forces.

67. Visual Inspection. An inspection of thevisible portions of completed construction forthe purpose of identifying code compliance.

IMHIS Definitions, Acronyms & Abbreviations2003 Edition

85

The following list defines acronyms andabbreviations as they are used in this standard.

01. ABS. Acrylonitrile butadiene styrene.

02. ADA. Americans with Disabilities Act.

03. ANSI. American National StandardInstitute.

04. ASTM. American Society for Testing andMaterials.

05. AWPA. American Wood ProductsAssociation.

06. CFR. Code of Federal Regulations.

07. CPVC. Chlorinated polyvinyl chloride.

08. DAPIA. Design Approval PrimaryInspection Agency. A state or privateorganization that has been accepted by theSecretary of HUD to evaluate and approvemanufactured home designs and quality controlprocedures.

09. FEMA. Federal Emergency ManagementAgency.

10. HUD. US Department of Housing andUrban Development.

11. IMHIS. Idaho Manufactured HomeInstallation Standard.

12. IPIA. Production Inspection PrimaryInspection Agency. A state or privateorganization that has been accepted by theSecretary of HUD to evaluate the ability ofmanufactured home manufacturers to followapproved quality control procedures andprovide ongoing surveillance of themanufacturing process.

13. NEC. National Electrical Code.

14. NFPA. National Fire ProtectionAssociation.

15. PEX. Cross linked polyethylene tubing.

16. PSI. Pounds per square inch.

17. PSF. Pounds per square foot.

18. PVC. Polyvinyl chloride.

19. UPC. Uniform Plumbing Code.

ACRONYMS AND ABBREVIATIONS.


86

Access & Egress. . . . . . . . . . . . . . . . . . . . . . 72Accessibility. . . . . . . . . . . . . . . . . . . . . . . . . . 75Accessories. . . . . . . . . . . . . . . . . . . . . . . . . . 68Accessory. . . . . . . . . . . . . . . . . . . . . . . . . . . . 69Accessory. . . . . . . . . . . . . . . . . . . . . . . . . . . . 72Accessory Buildings and Structures. . . . . . . 69Administrative Appeals. . . . . . . . . . . . . . . . . . 1After Market Installations. . . . . . . . . . . . . . . 59Alterations. . . . . . . . . . . . . . . . . . . . . . . . . . . . 3Alternate anchoring systems. . . . . . . . . . . . . 29Alternate anchoring systems. . . . . . . . . . . . . 47Anchoring. . . . . . . . . . . . . . . . . . . . . . . . 27, 46Appliance Compartment, Water Heater,

Furnace. . . . . . . . . . . . . . . . . . . . . . . . . . . . 76Appliance Listing. . . . . . . . . . . . . . . . . . . . . . 76Appliance Venting. . . . . . . . . . . . . . . . . . . . . 62Approval. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9Approved Installation Materials and

Components. . . . . . . . . . . . . . . . . 10, 17, 31Attached Garages. . . . . . . . . . . . . . . . . . . . . 69Attachment to Manufactured Home. . . . . . 73Authority. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1Basement Perimeter Support Foundation. . 45Block Pier Caps. . . . . . . . . . . . . . . . . . . . . . . 19Block Pier Caps. . . . . . . . . . . . . . . . . . . . . . . 33Block Pier Shims. . . . . . . . . . . . . . . . . . . . . . 21Block Pier Shims. . . . . . . . . . . . . . . . . . . . . . 33Block Pier Wedges. . . . . . . . . . . . . . . . . . . . 21Block Pier Wedges. . . . . . . . . . . . . . . . . . . . 34Block Piers. . . . . . . . . . . . . . . . . . . . . . . . . . . 19Block Piers. . . . . . . . . . . . . . . . . . . . . . . . . . . 33Bonding Strap Removal. . . . . . . . . . . . . . . . 51Carports & Awnings. . . . . . . . . . . . . . . . . . . 68Certification of Anchor Components. . . 29, 47Chassis Bonding. . . . . . . . . . . . . . . . . . . . . . 49Chassis Removal. . . . . . . . . . . . . . . . . . . . . . . 9Chimneys and Flues. . . . . . . . . . . . . . . . . . . . 72Clearances for Installation. . . . . . . . . . . 72, 75Close Up. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9Code. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69Combustion Air. . . . . . . . . . . . . . . . . . . . . . . 76Compliance. . . . . . . . . . . . . . . . . . . . . . . . . . . 9Component & Materials Specifications. 10, 21Condensation Drains. . . . . . . . . . . . . . . . . . . 59

Connections. . . . . . . . . . . . . . . . . . . . . . . . . . 53Construction Standard. . . . . . . . . . . . . . . . . 73Crossover Connection. . . . . . . . . . . . . . . . . . 49Crossover Ducts. . . . . . . . . . . . . . . . . . . . . . 59Decks, Porches, Landings, Stairs, Ramps,

and Guardrails. . . . . . . . . . . . . . . . . . . . . . 73Drain and Sewer Connections. . . . . . . . . . . 54Drain Test. . . . . . . . . . . . . . . . . . . . . . . . . . . 58Drainage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46Dryer Exhaust. . . . . . . . . . . . . . . . . . . . . . . . 75Dryer Exhaust Vents. . . . . . . . . . . . . . . . . . . 62Egress and Exit. . . . . . . . . . . . . . . . . . . . . . . 72Egress Requirements. . . . . . . . . . . . . . . . . . . 14Electrical Connections. . . . . . . . . . . . . . . . . 49Electrical Equipment. . . . . . . . . . . . . . . . . . . 51Electrical Feeder Connections. . . . . . . . . . . 49Electrical Testing. . . . . . . . . . . . . . . . . . . . . . 51Elevation. . . . . . . . . . . . . . . . . . . . . . . . . . . . 13Enclosed Exit Doors. . . . . . . . . . . . . . . . . . . 72Enclosure. . . . . . . . . . . . . . . . . . . . . . . . . . . . 68Enclosures. . . . . . . . . . . . . . . . . . . . . . . . . . . 72End Wall and Interior Wall Connections. . . 13Equipment Support. . . . . . . . . . . . . . . . . . . . 59Erosion. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10Fees. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3Figures. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1Flood Resistance. . . . . . . . . . . . . . . . . . . . . . 13Floor Access. . . . . . . . . . . . . . . . . . . . . . . . . 68Floor Connections. . . . . . . . . . . . . . . . . . . . . 11Flue Listing. . . . . . . . . . . . . . . . . . . . . . . . . . 76Footings. . . . . . . . . . . . . . . . . . . . . . . . . . 17, 31Foundations and Ground Level Access. . . . 67Foundations for Existing Home. . . . . . . . . . 44Frost Line. . . . . . . . . . . . . . . . . . . . . 10, 17, 31Furnaces, Gas Stoves, Water Heaters,

& Gas Fireplaces. . . . . . . . . . . . . . . . . . . . 76Grading. . . . . . . . . . . . . . . . . . . . . . . . . . 10, 46Height of Installation. . . . . . . . . . . . . . . 27, 38Inspection Approval. . . . . . . . . . . . . . . . . . . 14Inspection Criteria. . . . . . . . . . . . . . . . . . . . . . 3Inspections. . . . . . . . . . . . . . . . . . . . . . . . . . . . 3Installation and Alteration Permits. . . . . . . . . 3Installation Instructions. . . . . . . . . . . 4, 28, 75Installation Standard. . . . . . . . . . . . . . . . . . . . 7

IMHIS2004 Edition

SUBJECT INDEX

87

Installer. . . . . . . . . . . . . . . . . . . . . . . . . . . 3, 53Labeling. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76Lag Bolts. . . . . . . . . . . . . . . . . . . . . . . . . . . . 13Licensing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1Loads for Anchors. . . . . . . . . . . . . . . . . 27, 46Local Jurisdiction. . . . . . . . . . . . . . . . . . . . . . 3Location of Supports. . . . . . . . . 22, 26, 35, 37Lumber or Polymer Stacked Pads. . . . . . . . 21Main Frame Supports. . . . . . . . . . . . . . . 21, 34Manufacturer's Installation Instructions. . . . . 9Marriage Line Connections. . . . . . . . . . . . . 11Marriage Line Supports. . . . . . . . . . . . . 23, 35Mechanical Connections. . . . . . . . . . . . . . . . 59Mechanical Equipment. . . . . . . . . . . . . . . . . 59Multiple Permits. . . . . . . . . . . . . . . . . . . . . . . 3Obstructions. . . . . . . . . . . . . . . . . . . . . . . . . 72Operating Instructions. . . . . . . . . . . . . . . . . 75Original Exit Door. . . . . . . . . . . . . . . . . . . . . 72Original Installations. . . . . . . . . . . . . . . . . . . 59Other Appliances. . . . . . . . . . . . . . . . . . . . . . 75Other Permanent Foundation Designs. . . . . 44Other piers. . . . . . . . . . . . . . . . . . . . . . . . 21, 34Patching. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13Pellet Fired Appliances. . . . . . . . . . . . . . . . . 77Perimeter Foundations. . . . . . . . . . . . . . . . . 65Perimeter Supports. . . . . . . . . . . . . . . . . . . . 22Perimeter Supports. . . . . . . . . . . . . . . . . . . . 35Permanent Construction Requirements. . . . 15Permanent Foundation. . . . . . . . . . . . . . . . . 38Permits. . . . . . . . . . . . . . . . . . . . . . . . . 3, 53, 59Permits and Inspections. . . . . . . . . . . . . . . . 46Plan Reviews. . . . . . . . . . . . . . . . . . . . . . . . . . 3Plans. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3Plumbing Assembly. . . . . . . . . . . . . . . . . . . . 56Plumbing Tests. . . . . . . . . . . . . . . . . . . . . . . 57Porches. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69Power Supply. . . . . . . . . . . . . . . . . . . . . . . . 49Prefabricated Awnings & Carports. . . . . . . 68Prefabricated Piers. . . . . . . . . . . . . . . . . . . . 21Prefabricated Piers. . . . . . . . . . . . . . . . . 21, 34Prohibited Construction. . . . . . . . . . . . . . . . 73Prohibited Installations. . . . . . . . . . . . . . . . . 59Railing Installation. . . . . . . . . . . . . . . . . 15, 73Ramadas. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72

Ramps & Guardrails. . . . . . . . . . . . . . . . . . . 73Range Exhaust Vents. . . . . . . . . . . . . . . . . . 75Ranges & Dryers. . . . . . . . . . . . . . . . . . . . . . 75Real Property Designation. . . . . . . . . . . . . . 46Required Installations. . . . . . . . . . . . . . . . . . 73Requirement for Egress. . . . . . . . . . . . . . . . 72Ridge Beam Connections. . . . . . . . . . . . . . . 11Roof Support. . . . . . . . . . . . . . . . . . . . . . . . . 69Sealing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13Securement. . . . . . . . . . . . . . . . . . . . . . . . . . 76Separation for Fire Code. . . . . . . . . . . . . . . 69Separation From Ground. . . . . . . . . . . . . . . . 9Service Clearances. . . . . . . . . . . . . . . . . . . . 49Service Equipment Connection. . . . . . . . . . 49Service Equipment on Manufactured Home49Sewer Clean out Access. . . . . . . . . . . . . . . . 56Shimming. . . . . . . . . . . . . . . . . . . . . . . . . . . . 11Ship-Loose Plumbing. . . . . . . . . . . . . . . . . . 53Shipped Loose Equipment. . . . . . . . . . . . . . 51Site. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10Site Built. . . . . . . . . . . . . . . . . . . . . . . . . . . . 68Site Inspection. . . . . . . . . . . . . . . . . . . . . . . . . 3Site Preparation. . . . . . . . . . . . . . . . . . . . . . . . 9Skirting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65Skirting Access. . . . . . . . . . . . . . . . . . . . . . . 67Snow Loads. . . . . . . . . . . . . . . . . . . . . . . . . . . 7Solid Fuel Burning Fireplaces & Stoves. . . 77Stairs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15Stairway Access. . . . . . . . . . . . . . . . . . . . . . 68State. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3Stove Construction Requirements. . . . . . . . 76Suitability of Site. . . . . . . . . . . . . . . . . . . . . . . 9Table 400-A. . . . . . . . . . . . . . . . . . . . . . . . . . 26Table 500-A. . . . . . . . . . . . . . . . . . . . . . . . . . 37Temporary Placement. . . . . . . . . . . . . . . . . . . 9Testing. . . . . . . . . . . . . . . . . . . . 11, 21, 28, 51Tie Strapping. . . . . . . . . . . . . . . . . . . . . . 28, 47Underfloor Access. . . . . . . . . . . . . . . . . . . . . 67Underfloor Enclosures. . . . . . . . . . . . . . 13, 65Underfloor Ventilation. . . . . . . . . . . . . . . 9, 65Unforeseen Factors. . . . . . . . . . . . . . . . . . . . . 9Unique Installations. . . . . . . . . . . . . . . . . . . . . 7Unusual Installations. . . . . . . . . . . . . . . . . . . . 9Utilities Inspection. . . . . . . . . . . . . . . . . . . . . . 4

IMHIS2004 Edition

SUBJECT INDEX

88

Vapor Retarder. . . . . . . . . . . . . . . . . . . . . . . 10Venting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62Wall Attachment. . . . . . . . . . . . . . . . . . . . . . 68Wall Support. . . . . . . . . . . . . . . . . . . . . . . . . 68Water Connections. . . . . . . . . . . . . . . . . . . . 53

Water Test. . . . . . . . . . . . . . . . . . . . . . . . . . . 57Water Utility Size. . . . . . . . . . . . . . . . . . . . . 54Water Valve Access. . . . . . . . . . . . . . . . . . . 54Windows and Doors. . . . . . . . . . . . . . . . . . . 68Written Interpretations. . . . . . . . . . . . . . . . . . 1

IMHIS2004 Edition

SUBJECT INDEX

89


90

Figure 301.1. . . . . . . . . . . . . . . . . . 7, 10, 17, 44Figure 301.2. . . . . . . . . . . . . . . . . . 7, 10, 31, 38Figure 304.1. . . . . . . . . . . . . . . . . . . . . . . . . . 11Figure 304.2. . . . . . . . . . . . . . . . . . . . . . . . . . 11Figure 304.3. . . . . . . . . . . . . . . . . . . . . . . . . . 11Figure 304.4. . . . . . . . . . . . . . . . . . . . . . . . . . 13Figure 304.5. . . . . . . . . . . . . . . . . . . . . . . . . . 13Figure 306.1. . . . . . . . . . . . . . . . . . . . . . . . . . 15Figure 402.1. . . . . . . . . . . . . . . . . . . . 17, 19, 23Figure 402.2. . . . . . . . . . . . . . . . . . . . . . . . . . 17Figure 402.3. . . . . . . . . . . . . . . . . . . . . . . . . . 17Figure 402.4. . . . . . . . . . . . . . . . . . . . . . . . . . 17Figure 402.5. . . . . . . . . . . . . . . . . . . . . . . . . . 17Figure 402.6.. . . . . . . . . . . . . . . . . . . . . . . . . . 19Figure 402.7. . . . . . . . . . . . . . . . . . . . . . . . . . 19Figure 402.8. . . . . . . . . . . . . . . . . . . . 19, 21, 27Figure 402.9. . . . . . . . . . . . . . . . . . . . 19, 21, 27Figure 402.10. . . . . . . . . . . . . . . . . . . . . . . . . 21Figure 403.1. . . . . . . . . . . . . . . . . 21, 22, 23, 25Figure 403.2. . . . . . . . . . . . . . . . . . . . . . . . . . 23Figure 403.3. . . . . . . . . . . . . . . . . . . . . . . . . . 23Figure 403.4. . . . . . . . . . . . . . . . . . . . . . . . . . 25Figure 403.5. . . . . . . . . . . . . . . . . . . . . . . . . . 25Figure 406.1. . . . . . . . . . . . . . . . . . . . . . . . . . 28Figure 406.2. . . . . . . . . . . . . . . . . . . . . . . . . . 29Figure 502.1. . . . . . . . . . . . . . . . . . . . . . . . . . 31Figure 502.2. . . . . . . . . . . . . . . . . . . . . . . . . . 33Figure 502.3. . . . . . . . . . . . . . . . . . . . . . . . . . 33Figure 502.4. . . . . . . . . . . . . . . . . . . . . . . . . . 33Figure 502.5. . . . . . . . . . . . . . . . . . . . 33, 34, 38Figure 502.6. . . . . . . . . . . . . . . . . . . . . . . . . . 34

Figure 503.1. . . . . . . . . . . . . . . . . . . . . . . 34, 36Figure 504.1A. . . . . . . . . . . . . . . . . . . . . . 38, 40Figure 504.1B. . . . . . . . . . . . . . . . . . . . . . . . . 38Figure 504.1C. . . . . . . . . . . . . . . . . . . . . . 41, 42Figure 504.2A. . . . . . . . . . . . . . . . . . . . . . 38, 47Figure 504.2B. . . . . . . . . . . . . . . . . . . . . . 38, 47Figure 504.3A. . . . . . . . . . . . . . . . . . . . . . . . . 44Figure 504.3B. . . . . . . . . . . . . . . . . . . . . . . . . 44Figure 504.3C. . . . . . . . . . . . . . . . . . . . . . . . . 44Figure 504.4A. . . . . . . . . . . . . . . . . . . . . . 45, 46Figure 504.4B. . . . . . . . . . . . . . . . . . . . . . . . . 45Figure 505.1. . . . . . . . . . . . . . . . . . . . . . . . . . 47Figure 603.1. . . . . . . . . . . . . . . . . . . . . . . . . . 49Figure 605.1. . . . . . . . . . . . . . . . . . . . . . . . . . 51Figure 605.2. . . . . . . . . . . . . . . . . . . . . . . . . . 51Figure 703.1. . . . . . . . . . . . . . . . . . . . . . . . . . 54Figure 703.2. . . . . . . . . . . . . . . . . . . . . . . . . . 54Figure 704.1. . . . . . . . . . . . . . . . . . . . . . . . . . 56Figure 802.1. . . . . . . . . . . . . . . . . . . . . . . . . . 59Figure 803.1. . . . . . . . . . . . . . . . . . . . . . . . . . 61Figure 804.1. . . . . . . . . . . . . . . . . . . . . . . . . . 62Figure 804.2. . . . . . . . . . . . . . . . . . . . . . . . . . 62Figure 902.1. . . . . . . . . . . . . . . . . . . . . . . . . . 65Figure 902.2. . . . . . . . . . . . . . . . . . . . . . . . . . 65Figure 905.1. . . . . . . . . . . . . . . . . . . . . . . . . . 69Figure 906.1. . . . . . . . . . . . . . . . . . . . . . . . . . 69Figure 907.1. . . . . . . . . . . . . . . . . . . . . . . . . . 69Figure 908.1. . . . . . . . . . . . . . . . . . . . . . . . . . 72Figure 1004.1. . . . . . . . . . . . . . . . . . . . . . 76, 77Figure 1005.1. . . . . . . . . . . . . . . . . . . . . . . . . 79

(See also LIST OF FIGURES, Page xv)

IMHIS2004 Edition

FIGURE INDEX

91

IDAHO MANUFACTURED HOME INSTALLATION STANDARD · IDAHO MANUFACTURED HOME INSTALLATION STANDARD...

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