Section 04810 Unit Masonry Assemblies Part 1

Mt. Pleasant Library 04810-1 Permit Submission 4 December 2009

UNIT MASONRY ASSEMBLIES

SECTION 04810

PART 1 - GENERAL


1.1 RELATED DOCUMENTS

A. Drawings and general provisions of the Contract, including General and Supplementary Conditions and Division 1 Specification Sections, apply to this Section.

1.2 SUMMARY

A. This Section includes unit masonry assemblies consisting of the following:

1. Concrete masonry units. a. Normal weight

2. Mortar and grout. 3. Reinforcing steel. 4. Masonry joint reinforcement. 5. Ties and anchors. 6. Embedded flashing. 7. Miscellaneous masonry accessories.

B. Related Sections include the following:

1. Division 7 Section Building Insulation for cavity wall insulation. 2. Division 7 Section Flashing and Sheet Metal for sheet metal flashing.

C. Products furnished, but not installed, under this Section include the following:

1. Dovetail slots for masonry anchors, installed under Division 3 Section Cast-in-Place Concrete.

2. Anchor sections of adjustable masonry anchors for connecting to structural frame, installed under Division 5 Section Structural Steel.

D. Products installed, but not furnished, under this Section include the following:

1. Steel lintels and shelf angles for unit masonry, furnished under Division 5 Section Metal Fabrications.

2. Hollow-metal frames in unit masonry openings, furnished under Division 8 Section Steel Doors and Frames.



1.3 SUBMITTALS

A. Comply with Division 1 Section Submittal Procedures.

B. For Approval:

1. Product Data: For each different masonry unit, accessory, and other manufactured product specified.

2. Samples

a. For Verification: Colored mortar Samples for each color required, showing the full range of colors expected in the finished construction. Make samples using the same sand and mortar ingredients to be used on Project.

b. Accessories embedded in the masonry.

C. For Information:

1. List of Materials Used in Constructing Mockups: List generic product names together with manufacturers, manufacturers’ product names, model numbers, lot numbers, batch numbers, source of supply, and other information as required to identify materials used. Include mix proportions for mortar and grout and source of aggregates.

2. Qualification Data: For firms and persons specified in Quality Assurance Article. 3. Material Test Reports: From a qualified testing agency indicating and interpreting test

results of the following for compliance with requirements indicated:

a. Each type of masonry unit required. i Include test results, measurements, and calculations establishing net-area

compressive strength of masonry units.

b. Mortar complying with property requirements of ASTM C 270. c. Grout mixes complying with compressive strength requirements of ASTM C 476.

D. Cold-Weather Procedures: Detailed description of methods, materials, and equipment to be used to comply with cold-weather requirements.

1.4 QUALITY ASSURANCE

A. Source Limitations for Masonry Units: Obtain exposed masonry units of a uniform texture and color, or a uniform blend within the ranges accepted for these characteristics, through one source from a single manufacturer for each product required.

B. Source Limitations for Mortar Materials: Obtain mortar ingredients of a uniform quality, including color for exposed masonry, from one manufacturer for each cementitious component and from one source or producer for each aggregate.

C. Fire-Resistance Ratings: Where indicated, provide materials and construction identical to those of assemblies with fire-resistance ratings determined per ASTM E 119 by a testing and inspecting agency, by equivalent concrete masonry thickness, or by other means, as acceptable to authorities having jurisdiction.



D. Sample Panels: Before installing unit masonry, build sample panels as indicated on Drawings, using materials indicated for the completed Work, to verify selections made and to demonstrate aesthetic effects. Build sample panels for each type of exposed unit masonry assembly in sizes approximately 48 inches (1200mm) long by 48 inches (1200mm) high by full thickness, unless otherwise shown on the Drawings.

1. Locate panels in the locations indicated or, if not indicated, as directed by Designer. 2. Clean exposed faces of panels with masonry cleaner indicated. 3. Where masonry is to match existing, erect panels adjacent and parallel to existing

surface. 4. Protect approved sample panels from the elements with weather-resistant membrane. 5. Maintain sample panels during construction in an undisturbed condition as a standard for

judging the completed Work. 6. Approval of sample panels is for color, texture, and blending of masonry units;

relationship of mortar and sealant colors to masonry unit colors; tooling of joints; aesthetic qualities of workmanship; and other material and construction qualities specifically approved by Designer in writing.

a. Approval of sample panels does not constitute approval of deviations from the Contract Documents contained in sample panels, unless such deviations are specifically approved by Architect in writing.

7. Demolish and remove sample panels when directed.

1.5 DELIVERY, STORAGE, AND HANDLING

A. Store masonry units on elevated platforms in a dry location. If units are not stored in an enclosed location, cover tops and sides of stacks with waterproof sheeting, securely tied. If units become wet, do not install until they are dry.

1. Protect Type I concrete masonry units from moisture absorption so that, at the time of installation, the moisture content is not more than the maximum allowed at the time of delivery.

B. Store cementitious materials on elevated platforms, under cover, and in a dry location. Do not use cementitious materials that have become damp.

C. Store aggregates where grading and other required characteristics can be maintained and contamination avoided.

D. Store masonry accessories, including metal items, to prevent corrosion and accumulation of dirt and oil.

1.6 PROJECT CONDITIONS

A. Protection of Masonry: During construction, cover tops of walls, projections, and sills with waterproof sheeting at end of each day's work. Cover partially completed masonry when construction is not in progress.



1. Extend cover a minimum of 24 inches (600 mm)

2. Where one wythe of multiwythe masonry walls is completed in advance of other wythes, secure cover a minimum of

down both sides and hold cover securely in place.

24 inches (600 mm)

B. Do not apply uniform floor or roof loads for at least 12 hours and concentrated loads for at least 3 days after building masonry walls or columns.

down face next to unconstructed wythe and hold cover in place.

C. Stain Prevention: Prevent grout, mortar, and soil from staining the face of masonry to be left exposed or painted. Immediately remove grout, mortar, and soil that come in contact with such masonry.

1. Protect base of walls from rain-splashed mud and from mortar splatter by spreading coverings on ground and over wall surface.

2. Protect sills, ledges, and projections from mortar droppings. 3. Protect surfaces of window and door frames, as well as similar products with painted and

integral finishes, from mortar droppings. 4. Turn scaffold boards near the wall on edge at the end of each day to prevent rain from

splashing mortar and dirt onto completed masonry.

D. Cold-Weather Requirements: Do not use frozen materials or materials mixed or coated with ice or frost. Do not build on frozen substrates. Remove and replace unit masonry damaged by frost or by freezing conditions. Comply with cold-weather construction requirements contained in ACI 530.1/ASCE 6/TMS 602.

1. Cold-Weather Cleaning: Use liquid cleaning methods only when air temperature is 40 deg F (4 deg C)

E. Hot-Weather Requirements: Protect unit masonry work when temperature and humidity conditions produce excessive evaporation of water from mortar and grout. Provide artificial shade and wind breaks and use cooled materials as required.

and above and will remain so until masonry has dried, but not less than 7 days after completing cleaning.

1. When ambient temperature exceeds 100 deg F (38 deg C), or 90 deg F (32 deg C) with a wind velocity greater than 8 mph (13 km/h), do not spread mortar beds more than 48 inches (1200 mm) ahead of masonry. Set masonry units within one minute of spreading mortar.

PART 2 - PRODUCTS

2.1 CONCRETE MASONRY UNITS

A. General: Provide shapes indicated and as follows:

1. Provide special shapes for lintels, corners, jambs, sash, control joints, headers, bonding, and other special conditions.

2. Provide square-edged units for outside corners, unless otherwise indicated.

B. Concrete Masonry Units – Normal Weight: ASTM C 90 and as follows:



1. Unit Compressive Strength: Provide units with minimum average net-area compressive strength of 1900 psi (13.1 MPa).

2. Weight Classification: Normal weight, minimum density 120 pcf, unless otherwise indicated.

3. Size (Width): Manufactured to the following dimensions:

a. 4 inches nominal; 3-5/8 inches actual. b. 6 inches nominal; 5-5/8 inches actual. c. 8 inches nominal; 7-5/8 inches actual. d. 10 inches nominal; 9-5/8 inches actual. e. 12 inches nominal; 11-5/8 inches actual.

4. Exposed Faces: Manufacturer’s standard color and texture, unless otherwise indicated.

a. Where units are to be left exposed, provide color and texture matching the range represented by Architect’s sample.

2.2 MORTAR AND GROUT MATERIALS

A. Portland Cement: ASTM C 150, Type I or II. Type III cement may be used as part of an overall cold-weather construction program. Provide natural color or white cement.

B. Hydrated Lime: ASTM C 207, Types N and S.

C. Mortar Cements: ASTM C 1329.

D. Aggregate for Grout: ASTM C 404.

E. Cold-Weather Admixture: Nonchloride, noncorrosive, accelerating admixture complying with ASTM C 494, Type C, and recommended by the manufacturer for use in masonry mortar of composition indicated.

F. Water: Potable.

2.3 REINFORCING STEEL

A. Uncoated Steel Reinforcing Bars: ASTM A 615/A 615M, Grade 60 (Grade 400).

2.4 MASONRY JOINT REINFORCEMENT

A. General: ASTM A 951 and as follows:

1. Hot-dip galvanized after fabrication in accordance with ASTM A-153, grade B, carbon-steel wire for both interior and exterior walls.

2. Wire Size for Side Rods: W2.8 or 0.188-inch (4.8-mm) diameter. 3. Wire Size for Cross Rods: W2.8 or 0.188-inch (4.8-mm) diameter. 4. Provide in lengths of not less than 10 feet (3 m), with prefabricated corner and tee units

where indicated.



B. For single-wythe masonry, provide either ladder or truss type with single pair of side rods and cross rods spaced not more than 16 inches (407 mm) o.c.

C. For multiwythe masonry, provide types as follows:

1. Ladder type with perpendicular cross rods spaced not more than 16 inches (407 mm) o.c. and 1 side rod for each face shell of hollow masonry units more than 4 inches (100 mm) in width, plus 1 side rod for each wythe of masonry 4 inches (100 mm) or less in width.

2. Tab type with single pair of side rods spaced for embedment within each face shell of backup wythe and rectangular box-type cross ties spaced not more than 16 inches (407 mm) o.c. Size ties to extend at least halfway through outer wythe but with at least 5/8-inch (16-mm) cover on outside face.

3. Adjustable (2-piece) type with single pair of side rods and cross ties spaced not more than 16 inches (407 mm) o.c. and with separate adjustable veneer ties engaging the cross ties. Cross ties are either U-shaped with eyes or rectangular. Space side rods for embedment within each face shell of backup wythe and size adjustable ties to extend at least halfway through outer wythe but with at least 5/8-inch (16 mm) cover on outside face.

2.5 TIES AND ANCHORS, GENERAL

A. General: Provide ties and anchors, specified in subsequent articles, made from materials that comply with this Article, unless otherwise indicated.

B. Mill Galvanized Carbon Steel Wire: ASTM A 82; with ASTM A 641 (ASTM A 641M), Class 1 coating.

C. Hot-Dip Galvanized Carbon-Steel Wire: ASTM A 82; with ASTM A 153, Class B-2 coating.

D. Steel Plates, Shapes, and Bars: ASTM A 36/A 36M.

2.6 BENT WIRE TIES

A. General: Rectangular units with closed ends and not less than 4 inches (100 mm) wide. Z-shaped ties with ends bent 90 degrees to provide hooks not less than 2 inches (50 mm) long may be used for masonry constructed from solid units or hollow units laid with cells horizontal.

1. Where coursing between wythes does not align, use adjustable ties composed of 2 parts; 1 with pintles, the other with eyes; with maximum misalignment of 1-1/4 inches (32 mm).

B. Wire: Fabricate from 1/4-inch-(6.4-mm-) diameter, hot-dip galvanized steel wire. Mill galvanized wire ties may be used in interior walls where humidity does not exceed 75 percent.

2.7 ADJUSTABLE ANCHORS FOR CONNECTING STEEL FRAME

A. General: Provide two-piece assemblies that allow vertical or horizontal adjustment but resist tension and compression forces perpendicular to plane of wall.



1. Anchor Section: 12 gauge, hot dip galvanized, weld on channel slots, 7-1/2 inch long, spaced a maximum of 24 inches on center vertically and horizontally. Mill galvanized may be used at interior walls where humidity does not exceed 75 percent.

2. Tie Section: Triangular-shaped wire tie, sized to extend within 1 inch (25 mm) of masonry face, made from 3/16-inch-(0.1875-mm)-diameter, hot-dip galvanized steel wire. Mill galvanized wire may be used at interior walls where humidity does not exceed 75 percent.

2.8 ANCHORS FOR CONNECTING TO CONCRETE

A. General: Provide two-piece assemblies that allow vertical or horizontal adjustment but resist tension and compression forces perpendicular to plane of wall.

1. Anchor Section:

a. Dovetail anchor section formed from 0.0966-inch-(2.5-mm)- thick,

i Stainless steel sheet, for use at precast panels ii All other locations, sheet steel galvanized after fabrication.

b. 0.064-inch-(1.6-mm-) thick, galvanized sheet may be used at interior walls where humidity does not exceed 75 percent.

2. Tie Section:

a. Triangular-shaped wire tie, sized to extend within 1 inch (25 mm) of masonry face, made from 0.25-inch-(6.4-mm-) diameter,

b. Stainless steel for use at precast panels. c. All other locations, hot-dip galvanized. d. Mill galvanized wire may be used at interior walls where humidity does not exceed

75 percent.

2.9 RIGID ANCHORS

A. General: Fabricate from steel bars as follows:

1. 1-1/2 inches (38 mm) wide by 1/4 inch (6.4 mm) thick by 24 inches (600 mm) long, with ends turned up 2 inches (50 mm) or with cross pins.

2. Finish: Hot-dip galvanized to comply with ASTM A 153.

2.10 MISCELLANEOUS ANCHORS

A. Anchor Bolts: Steel bolts complying with ASTM A 307, Grade A (ASTM F 568M), Property Class 4.6; with ASTM A 563 (ASTM A 563M)

1. Headed bolts.

hex nuts and, where indicated, flat washers; of diameter and length indicated and in the following configurations:



B. Postinstalled Anchors: Anchors as described below, with capability to sustain, without failure, load imposed with factors of safety indicated, as determined by testing per ASTM E 488, conducted by a qualified independent testing agency.

1. Type: Expansion anchors (sleeve anchors). 2. Corrosion Protection: Carbon-steel components zinc plated to comply with ASTM B

633, Class Fe/Zn 5 (5 microns) for Class SC 1 service condition (mild). 3. Corrosion Protection: Where indicated on Drawings, stainless-steel components

complying with ASTM F 593 and ASTM F 594, Alloy Group 1 or 2 (ASTM F 738 M and ASTM F 836M), Alloy Group 1 or 4 for bolts and nuts; ASTM A 666 or ASTM A 276, Type 304 or 316, for anchors.

4. For Postinstalled Anchors in Concrete: Capability to sustain, without failure, a load equal to four times the loads imposed.

5. For Postinstalled Anchors in Grouted Masonry Units: Capability to sustain, without failure, a load equal to six times the loads imposed.

2.11 EMBEDDED FLASHING MATERIALS

A. Metal Flashing: Fabricate from the following metal complying with requirements specified in Division 7 Section Flashing and Sheet Metal and below:

1. Stainless Steel: ASTM A 240/A 240M, type 304, 0.016 (0.4mm thick) unless otherwise indicated.

2. Fabricate metal drip edges from sheet metal indicated above. Extend at least 3 inches (75 mm) into wall and 1/2 inch (13 mm) out from wall, with a hemmed outer edge bent down 30 degrees.

3. Fabricate metal flashing terminations from sheet metal indicated above. Extend at least 3 inches (75 mm) into wall and out to exterior face of wall. At exterior face of wall, bend metal back on itself for 3/4 inch (19 mm) and then down into joint 3/8 inch (10 mm) to form a stop for retaining sealant backer rod.

B. Solder and Sealants for Sheet Metal Flashings:

1. Refer to Division 7 Section Flashing and Sheet Metal.

C. Flexible Flashing: For flashing not exposed to the exterior, use of the following is acceptable, unless otherwise indicated:

1. Copper-Laminated Flashing: 7-oz./sq. ft. (2-kg/sq. m)

2.12 MISCELLANEOUS MASONRY ACCESSORIES

copper sheet bonded with asphalt between 2 layers of glass-fiber cloth. Use only where flashing is fully concealed in masonry.

A. Compressible Filler: Premolded filler strips complying with ASTM D 1056, Grade 2A1; compressible up to 35 percent; formulated from neoprene.

B. Column Isolation Joint Material: Premolded filler strips complying with ASTM D 1056, Grade 2A1; compressible up to 35 percent; formulated from neoprene.



C. Preformed Control-Joint Gaskets: If indicated on the Drawings, provide material as indicated below, designed to fit standard sash block and to maintain lateral stability in masonry wall; size and configuration as indicated.

1. Styrene-Butadiene-Rubber Compound: ASTM D 2000, Designation M2AA-805.

D. Bond-Breaker Strips: Asphalt-saturated, organic roofing felt complying with ASTM D 226, Type I (No. 15 asphalt felt).

E. Reinforcing Bar Positioners: Wire units designed to fit into mortar bed joints spanning masonry unit cells with loops for holding reinforcing bars in center of cells. Units are formed from 0.187-inch (4.8-mm)

1. Provide units with either two loops or four loops as needed for number of bars indicated.

steel wire, hot-dip galvanized after fabrication.

2.13 MASONRY CLEANERS

A. Job-Mixed Detergent Solution: Solution of 1/2-cup (0.14-L) dry measure tetrasodium polyphosphate and 1/2-cup (0.14-L) dry measure laundry detergent dissolved in 1 gal. (4 L) water.

2.14 MORTAR AND GROUT MIXES

A. General: Do not use admixtures, including pigments, air-entraining agents, accelerators, retarders, water-repellent agents, antifreeze compounds, or other admixtures, unless otherwise indicated.

1. Do not use calcium chloride in mortar or grout.

B. Mortar for Unit Masonry: Comply with ASTM C 270, Proportion Specification.

1. Limit cementitious materials in mortar to Portland cement, mortar cement, and lime. 2. For masonry below grade, in contact with earth, and load bearing walls and where

indicated, use Type S. 3. For reinforced masonry and where indicated, use Type S. 4. Color: to be selected.

C. Grout for Unit Masonry: Comply with ASTM C 476.

1. Use grout of type indicated or, if not otherwise indicated, of type (fine or coarse) that will comply with Table 5 of ACI 530.1/ASCE 6/TMS 602 for dimensions of grout spaces and pour height.

2. Provide grout with a slump of 8 to 11 inches (200 to 280 mm)

3. Maximum height of vertical grout lift = 5ft-0 inches.

as measured according to ASTM C 143.



PART 3 - EXECUTION

3.1 EXAMINATION

A. Examine conditions, with Installer present, for compliance with requirements for installation tolerances and other conditions affecting performance of work.

1. For the record, prepare written report, endorsed by Installer, listing conditions detrimental to performance.

2. Verify that foundations are within tolerances specified. 3. Verify that reinforcing dowels are properly placed. 4. Proceed with installation only after unsatisfactory conditions have been corrected.

B. Before installation, examine rough-in and built-in construction to verify actual locations of piping connections.

3.2 INSTALLATION, GENERAL

A. Thickness: Build masonry construction to full thickness shown. Build single-wythe walls to actual widths of masonry units, using units of widths indicated.

B. Build chases and recesses to accommodate items specified in this Section and in other Sections of the Specifications.

C. Leave openings for equipment to be installed before completing masonry. After installing equipment, complete masonry to match the construction immediately adjacent to the opening.

D. Cut masonry units with motor-driven saws to provide clean, sharp, unchipped edges. Cut units as required to provide a continuous pattern and to fit adjoining construction. Where possible, use full-size units without cutting. Allow units cut with water-cooled saws to dry before placing, unless wetting of units is specified. Install cut units with cut surfaces and, where possible, cut edges concealed.

E. Select and arrange units for exposed unit masonry to produce a uniform blend of colors and textures.

1. Mix units from several pallets or cubes as they are placed.

3.3 CONSTRUCTION TOLERANCES

A. Comply with construction tolerances in ACI 530.1/ASCE 6/TMS 602 and with the following:

B. For conspicuous vertical lines, such as external corners, door jambs, reveals, and expansion and control joints, do not vary from plumb by more than 1/8 inch in 10 feet (3 mm in 3 m), 1/4 inch in 20 feet (6 mm in 6 m), or 1/2 inch (12 mm)

C. For vertical alignment of exposed head joints, do not vary from plumb by more than

maximum.

1/4 inch in 10 feet (6 mm in 3 m), nor 1/2 inch (12 mm) maximum.



D. For conspicuous horizontal lines, such as exposed lintels, sills, parapets, and reveals, do not vary from level by more than 1/4 inch in 20 feet (6 mm in 6 m), nor 1/2 inch (12 mm)

E. For exposed bed joints, do not vary from thickness indicated by more than plus or minus

maximum.

1/8 inch (3 mm), with a maximum thickness limited to 1/2 inch (12 mm). Do not vary from bed-joint thickness of adjacent courses by more than 1/8 inch (3 mm)

F. For exposed head joints, do not vary from thickness indicated by more than plus or minus

.

1/8 inch (3 mm). Do not vary from adjacent bed-joint and head-joint thicknesses by more than 1/8 inch (3 mm)

3.4 LAYING MASONRY WALLS

.

A. Lay out walls in advance for accurate spacing of surface bond patterns with uniform joint thicknesses and for accurate location of openings, movement-type joints, returns, and offsets. Avoid using less-than-half-size units, particularly at corners, jambs, and, where possible, at other locations.

B. Bond Pattern for Exposed Masonry: Lay exposed masonry in the following bond pattern; do not use units with less than nominal 4-inch (100-mm) horizontal face dimensions at corners or jambs

1. Running bond.

C. Lay concealed masonry with all units in a wythe in running bond or bonded by lapping not less than 2 inches (50 mm). Bond and interlock each course of each wythe at corners. Do not use units with less than nominal 4-inch (100-mm)

D. Stopping and Resuming Work: In each course, rack back one-half-unit length for one-half running bond or one-third-unit length for one-third running bond; do not tooth. Clean exposed surfaces of masonry, wet clay masonry units lightly if required, and remove loose masonry units and mortar before laying fresh masonry.

horizontal face dimensions at corners or jambs.

E. Built-in Work: As construction progresses, build in items specified under this and other Sections of the Specifications. Fill in solidly with masonry around built-in items.

F. Fill space between hollow-metal frames and masonry solidly with mortar.

G. Where built-in items are to be embedded in cores of hollow masonry units, place a layer of metal lath in the joint below and rod mortar or grout into core.

H. Fill cores in hollow concrete masonry units with grout 24 inches (600 mm)

I. Build non-load-bearing interior partitions full height of story to underside of solid floor or roof structure above, unless otherwise indicated.

under bearing plates, beams, lintels, posts, and similar items, unless otherwise indicated.

1. Install compressible filler in joint between top of partition and underside of structure above.



2. At fire-rated partitions, install firestopping in joint between top of partition and underside of structure above.

3.5 MORTAR BEDDING AND JOINTING

A. Lay hollow masonry units as follows:

1. With full mortar coverage on horizontal and vertical face shells. 2. Bed webs in mortar in starting course on footings and in all coursed of piers, columns,

and pilasters, and where adjacent to cells or cavities to be filled with grout. 3. For starting course on footings where cells are not grouted, spread out full mortar bed,

including areas under cells. 4. Clean soiled surfaces with fiber brush and soap powder and rinse thoroughly with clear

water. 5. Wet joint surfaces thoroughly before applying mortar.

B. Tool exposed joints slightly concave when thumbprint hard, using a jointer larger than joint thickness, unless otherwise indicated.

C. Interior Masonry Walls: Unless otherwise indicated, cut joints flush for masonry walls to receive plaster or other direct-applied finishes (other than paint).

3.6 BONDING OF MULTIWYTHE MASONRY

A. Use individual metal ties installed in horizontal joints to bond wythes together. Provide ties as shown, but not less than one metal tie for 2.67 sq. ft. (0.25 sq. m) of wall area spaced not to exceed 24 inches (610) o.c. horizontally and 16 inches (406 mm) o.c. vertically. Stagger ties in alternate courses. Provide additional ties within 12 inches (305 mm) of openings and space not more than 36 inches (915 mm) apart around perimeter of openings. At intersecting and abutting walls, provide ties at no more than 24 inches (610 mm) o.c. vertically.

B. Use masonry joint reinforcement installed in horizontal mortar joints to bond wythes together.

C. Use either bonding system specified above.

D. Corners: Provide interlocking masonry unit bond in each wythe and course at corners, unless otherwise indicated.

1. Provide continuity with masonry joint reinforcement at corners by using prefabricated “L” units as well as masonry bonding.

E. Intersecting and Abutting Walls: Unless vertical expansion or control joints are shown at juncture, bond walls together as follows:

1. Provide individual metal ties not more than 16 inches (406 mm) o.c. 2. Provide continuity with masonry joint reinforcement by using prefabricated “T” units.



3.7 MASONRY JOINT REINFORCEMENT

A. General: Provide continuous masonry joint reinforcement as indicated. Install entire length of longitudinal side rods in mortar with a minimum cover of 5/8 inch (16 mm) on exterior side of walls, 1/2 inch (13 mm) elsewhere. Lap reinforcement a minimum of 6 inches (150 mm).

1. Space reinforcement not more than 16 inches (406 mm)2. Space reinforcement not more than

o.c. 8 inches (203 mm)

3. Provide reinforcement not more than o.c. in parapet walls.

8 inches (203 mm) above and below wall openings and extending 12 inches (305 mm)

a. Reinforcement above is in addition to continuous reinforcement. Provide 3 continuous courses above opening, and 2 continuous courses below opening.

beyond openings.

B. Cut or interrupt joint reinforcement at control and expansion joints, unless otherwise indicated.

C. Provide continuity at corners and wall intersections by using prefabricated “L” and “T” sections. Cut and bend reinforcing units as directed by manufacturer for continuity at returns, offsets, column fireproofing, pipe enclosures, and other special conditions.

3.8 ANCHORING MASONRY TO STRUCTURAL MEMBERS

A. Anchor masonry to structural members where masonry abuts or faces structural members to comply with the following:

1. Provide an open space not less than 1 inch (25 mm) in width between masonry and structural member, unless otherwise indicated. Keep open space free of mortar or other rigid materials.

2. Anchor masonry to structural members with anchors embedded in masonry joints and attached to structure.

3. Space anchors as indicated, but not more than 16 inches

3.9 ANCHORING MASONRY VENEERS

o.c. vertically and horizontally.

A. Anchor masonry veneers to concrete and masonry backup with masonry-veneer anchors to comply with the following requirements:

1. Fasten each anchor section with two metal fasteners of type indicated. 2. Fasten anchors to concrete and masonry backup with metal fasteners of type indicated. 3. Space anchors as indicated, but not more than 16 inches (406 mm) o.c. vertically and 24

inches (610 mm) o.c. horizontally with not less than 1 anchor for each 2.67 sq. ft. (0.25 sq. m) of wall area. Install additional anchors within 12 inches (305 mm) of openings and at intervals, not exceeding 36 inches (914 mm)

3.10 LINTELS

, around perimeter.

A. Install steel lintels where indicated.



B. Provide masonry lintels where shown and where openings of more than 12 inches (305 mm) for brick-size units and 24 inches (610 mm)

C. Provide minimum bearing of

for block-size units are shown without structural steel or other supporting lintels.

8 inches (200 mm)

3.11 FLASHING, WEEP HOLES, AND VENTS

at each jamb, unless otherwise indicated.

A. General: Install embedded flashing and weep holes in masonry at shelf angles, lintels, ledges, ledges, other obstructions to downward flow of water in wall, and where indicated.

B. Prepare masonry surfaces so they are smooth and free from projections that could puncture flashing. Unless other wise indicated, place through-wall flashing on sloping bed of mortar and cover with mortar. Before covering with mortar, seal penetrations in flashing with adhesive, sealant, or tape as recommended by flashing manufacturer.

C. Install flashing as follows:

1. At multiwythe masonry walls, extend flashing from exterior face of outer wythe of masonry, through outer wythe, turned up a minimum of 8 inches (200 mm), and through inner wythe to within 1/2 inch (13 mm) of the interior face of the wall in exposed masonry. Where interior surface of inner wythe is concealed by furring, carry flashing completely through inner wythe and turn flashing up approximately 2 inches (50 mm), unless otherwise indicated.

2. At lintels and shelf angles, extend flashing a minimum of 4inches (100mm) into masonry at each end. At heads and sills, extend flashing 4inches

3.

(100mm) at the ends and turn flashing up not less than 2 inches (50 mm) to form a pan.

D. Install weep holes in head joints in exterior wythes of the first course of masonry immediately above embedded flashing and as follows:

Extend sheet metal flashing 1/2 inch (13 mm) beyond face of masonry at exterior and turn flashing down to form a drip.

1. Use open head joints to form weep holes. 2. Unless otherwise noted, space weep holes 24 inches o.c.

E. Install reglets and nailers for flashing and other related construction where they are shown to be built into masonry.

3.12 REPAIRING, POINTING, AND CLEANING

A. Remove and replace masonry units that are loose, chipped, broken, stained, or otherwise damaged or that do not match adjoining units. Install new units to match adjoining units; install in fresh mortar, pointed to eliminate evidence of replacement.

B. Pointing: During the tooling of joints, enlarge voids and holes, except weep holes, and completely fill with mortar. Point up joints, including corners, openings, and adjacent construction, to provide a neat, uniform appearance. Prepare joints for sealant application, where indicated.



C. Rake and repoint as necessary to eliminate cracked joints.

D. In-Progress Cleaning: Clean unit masonry as work progresses by dry brushing to remove mortar fins and smears before tooling joints and washdown as necessary. Preform cleaning of unit masonry frequently enough that detergent cleaning, with the product specified in Part 2 of this Section, is sufficient means for cleaning.

E. Final Cleaning: After mortar is thoroughly set and cured, clean exposed masonry as follows:

1. Remove large mortar particles by hand with wooden paddles and nonmetallic scrape hoes or chisels.

2. Test cleaning methods on sample wall panel; leave one-half of panel uncleaned for comparison purposes. Obtain Designer's approval of sample cleaning before proceeding with cleaning of masonry.

3. Protect adjacent stone and non-masonry surfaces from contact with cleaner by covering them with liquid strippable masking agent, polyethylene film, or waterproof masking tape.

4. Wet wall surfaces with water before applying cleaners; remove cleaners promptly by rinsing the surfaces thoroughly with clear water.

3.13 MASONRY WASTE DISPOSAL

A. Recycling: Unless otherwise indicated, excess masonry materials are Contractor’s property.

END OF SECTION 04810

Mt. Pleasant Library 04851-1 100% Printing: 20 March 2009 CORE Group, P.C. DIMENSION STONE CLADDING

SECTION 04851

PART 1 - GENERAL

DIMENSION STONE CLADDING

1.1 RELATED DOCUMENTS

A. Drawings and general provisions of the Contract, including General and Supplementary Conditions and Division 1 Specification Sections, apply to this Section.

1.2 SUMMARY

A. This Section includes the following types of dimension stone:

1. Panels set with individual anchors. 2. Panels set in concrete masonry. 3. Trim units, including bands, copings, sills, jambs and soffits.

B. See Division 8 Section "Glazed Aluminum Curtain Walls" for installing dimension stone panels in aluminum curtain-wall systems.

C. Allowances: Furnish preconstruction testing under the Inspection and Testing Allowance as specified in Division 1 Section "Allowances."

1.3 PERFORMANCE REQUIREMENTS

A. General: Design stone anchors and anchoring systems according to ASTM C 1242.

B. Structural Performance: Provide dimension stone cladding system capable of withstanding the effects of gravity loads and the following loads and stresses within limits and under conditions indicated:

1. Wind Loads: Determine loads based on design wind pressures indicated on Drawings. 2. Equipment Loads: Allow for loads due to window cleaning and maintenance equipment.

C. Seismic Performance: Provide dimension stone cladding system capable of withstanding the effects of earthquake motions determined according to ASCE 7.

D. Safety Factors for Stone: Design dimension stone cladding system to withstand loads indicated without exceeding allowable working stress of stone determined by dividing stone's average ultimate strength, as established by testing, by the following safety factors:

1. Safety Factor for Granite: 3.


1.4 SUBMITTALS

A. Product Data: For each variety of stone, stone accessory, and other manufactured products indicated.

B. Shop Drawings: Show fabrication and installation details for dimension stone cladding system, including dimensions and profiles of stone units.

1. Show locations and details of joints both within dimension stone cladding system and between dimension stone cladding system and other construction.

2. Show locations and details of anchors and backup structure. 3. For installed products indicated to comply with design loads, include structural analysis

data signed and sealed by the qualified professional engineer responsible for their preparation.

C. Stone Samples: Sets for each color, grade, finish, and variety of stone required; not less than 12 inches (300 mm)

D. Sealant Samples: For each type and color of joint sealant required.

square.

E. Material Test Reports: From a qualified independent testing agency, as follows:

1. Stone Test Reports: For each stone variety proposed for use on Project, provide test data indicating compliance with required physical properties, other than abrasion resistance, according to referenced ASTM standards. Base reports on testing done within previous five years.

1.5 QUALITY ASSURANCE

A. Testing Agency Qualifications: An independent agency qualified according to ASTM E 329 for testing indicated.

B. Source Limitations for Stone: Obtain each variety of stone, regardless of finish, from a single quarry.

C. Preconstruction Stone Testing: Owner will engage a qualified independent testing agency to perform preconstruction testing indicated below. Payment for these services will be made by Owner.

D. Preconstruction Stone Testing: Engage a qualified independent testing agency to perform preconstruction testing indicated below.

1. Furnish test specimens that are representative of materials proposed for incorporation into the Work.

2. Physical Property Tests: For each stone variety proposed for use on Project, tested for compliance with physical property requirements, other than abrasion resistance, according to referenced ASTM standards.

3. Flexural Strength Tests: For each combination of stone variety, thickness, orientation of cut, and finish, proposed for use on Project, tested according to ASTM C 880, in both wet and dry conditions.


4. Anchorage Tests: For each combination of stone variety, orientation of cut, finish, and anchor type proposed for use on Project, tested according to ASTM C 1354.

E. Mockups: Build mockups to verify selections made under sample submittals and to demonstrate aesthetic effects and set quality standards for materials and execution.

1. Build mockups of typical exterior wall with dimension stone cladding, approximately 72 inches (1800 mm) long by 48 inches (1200 mm)

1.6 PROJECT CONDITIONS

high.

A. Environmental Limitations for Mortar: Do not use frozen materials or materials mixed or coated with ice or frost. Remove and replace dimension stone cladding damaged by frost or freezing conditions. Comply with cold- and hot-weather construction and protection requirements for masonry contained in ACI 530.1/ASCE 6/TMS 602.

B. Environmental Limitations for Sealants: Do not install sealants when ambient and substrate temperatures are outside limits permitted by sealant manufacturer or below 40 deg F (5 deg C)

PART 2 - PRODUCTS

or when joint substrates are wet.

2.1 GRANITE

A. Granite: Comply with ASTM C 615.

B. Basis-of-Design Product – Exterior Wall and Base Course Panel ST-1: or approved equal product as determined by Architect. 1. Finish, Panel Size and Thickness: As indicated on Drawings.

C. Basis-of-Design Product – Entry Exterior Wall Panel ST-2: or approved equal product as determined by Architect. 1. Finish, Panel Size and Thickness: As indicated on Drawings.

D. Basis-of-Design Product – Entry Exterior Wall Panel ST-3: or approved equal product as determined by Architect. 1. Finish, Panel Size and Thickness: As indicated on Drawings.

E. Match Architect's samples for stone characteristics relating to aesthetic effects.

2.2 LIMESTONE

A. Limestone: Comply with ASTM C 568.


1. Classification: Medium-Density 2. Description: Oolitic limestone.

B. Variety and Sources: Indiana oolitic limestone quarried in Lawrence, Monroe, or Owen Counties, Indiana.

C. Indiana Oolitic Limestone Grade and Color: To match existing

D. Finish: To match existing

2.3 QUARTZ-BASED STONE

A. Quartz-Based Stone: Comply with ASTM C 616, Classification III Quartzite.

B. Finish: Match Architect's sample.

C. Match Architect's samples for stone characteristics relating to aesthetic effects.

2.4 MORTAR MATERIALS

A. Portland Cement: Refer to section 02781

1. Low-Alkali Cement: Portland cement for use with limestone shall contain not more than 0.60 percent total alkali when tested according to ASTM C 114.

B. Hydrated Lime: ASTM C 207.

C. Aggregate: ASTM C 144; except for joints narrower than 1/4 inch (6 mm) and pointing mortar, use aggregate graded with 100 percent passing No. 16 (1.18-mm)

D. Mortar Pigments: Natural and synthetic iron oxides, compounded for use in mortar mixes. Use only pigments with a record of satisfactory performance in mortar and containing no carbon black.

sieve.

E. Water: Potable.

2.5 ANCHORS AND BACKUP STRUCTURE

A. Basis-of-Design Product for Exterior Wall Panel ST-1, ST-2, ST-3: Subject to compliance with stone manufacturer’s requirements.

B. Fabricate anchors, including shelf angles, from stainless steel, ASTM A 666, Type 304. Fabricate dowels and pins from stainless steel, ASTM A 276, Type 304.

C. Threaded Fasteners:

1. For stainless steel, use stainless-steel bolts, nuts, and washers; ASTM F 593 and ASTM F 594, Alloy Group 1 or 2 (ASTM F 738M and ASTM F 836M, Alloy Group A1 or A4).


D. Weld Plates for Installation in Concrete: Comply with Division 5 Section "Metal Fabrications."

2.6 STONE ACCESSORIES

A. Setting Shims: Strips of resilient plastic or vulcanized neoprene, Type A Shore durometer hardness of 50 to 70, nonstaining to stone, of thickness needed to prevent point loading of stone on anchors and of depths to suit anchors without intruding into required depths of pointing materials.

B. Concealed Sheet Metal Flashing: Fabricate from zinc-tin alloy-coated stainless steel in thicknesses indicated, but not less than 0.0156 inch (0.4 mm)

C. Weep and Vent Tubes: Medium-density polyethylene tubing,

thick. Comply with requirements specified in Division 7 Section "Sheet Metal Flashing and Trim."

1/4-inch (6-mm)

2.7 STONE FABRICATION

OD and of length required to extend from exterior face of stone to cavity behind.

A. Control depth of stone and back check to maintain minimum clearance of 1 inch (25 mm)

B. Dress joints (bed and vertical) straight and at right angle to face, unless otherwise indicated.

between backs of stone units and surfaces or projections of structural members, fireproofing (if any), backup walls, and other work behind stone.

C. Finish exposed faces and edges of stone, except sawed reveals, to comply with requirements indicated for finish and to match approved samples and mockups.

D. Cut stone to produce uniform joints 3/8 inch (10 mm)

E. Contiguous Work: Provide chases, reveals, reglets, openings, and similar features as required to accommodate contiguous work.

wide and in locations indicated.

F. Fabricate molded work, including washes and drips, to produce stone shapes with a uniform profile throughout entire unit length, with precisely formed arris slightly eased to prevent snipping, and with matching profile at joints between units.

2.8 MORTAR MIXES

A. General: Comply with referenced standards and with manufacturers' written instructions. Do not use admixtures, unless otherwise indicated.

B. Portland Cement-Lime Setting Mortar: Comply with ASTM C 270, Proportion Specification, for Type S mortar.

C. Pointing Mortar: Comply with ASTM C 270, Proportion Specification, for types of mortar indicated. Provide Type S pointing mortar mixed to match Architect's sample and complying with the following:


PART 3 - EXECUTION

3.1 SETTING DIMENSION STONE CLADDING, GENERAL

A. Coat limestone with dampproofing to extent indicated below:

1. Stone at Grade: Beds, joints, and back surfaces to at least 12 inches (300 mm)

2. Stone Extending below Grade: Beds, joints, back surfaces, and face surfaces below grade.

above finish-grade elevations.

B. Execute dimension stone cladding installation by skilled mechanics and employ skilled stone fitters to do necessary field cutting as stone is set. Use power saws with diamond blades to cut stone.

C. Set stone to comply with requirements indicated on Drawings and Shop Drawings. Install anchors, supports, fasteners, and other attachments indicated or necessary to secure dimension stone cladding in place. Shim and adjust anchors, supports, and accessories to set stone accurately in locations indicated with uniform joints of widths indicated and with edges and faces aligned according to established relationships and indicated tolerances.

D. Provide expansion, control, and pressure-relieving joints of widths and at locations indicated.

1. Sealing expansion and other joints is specified in Division 7 Section "Joint Sealants." 2. Keep expansion joints free of mortar and other rigid materials.

E. Install concealed flashing at continuous shelf angles, lintels, ledges, and similar obstructions to downward flow of water to divert water to building exterior.

F. Keep cavities open where unfilled space is indicated between back of stone units and backup wall; do not fill cavities with mortar or grout.

1. Place weep holes in joints where moisture may accumulate, including base of cavity walls, above shelf angles, and flashing. Locate weep holes at intervals not exceeding 24 inches (600 mm)

2. Place vents in cavity walls at tops of cavities, below shelf angles and flashing, and at intervals not exceeding

.

20 feet (6 m) vertically. Locate vents in joints at intervals not exceeding 60 inches (1500 mm)

3.2 SETTING MECHANICALLY ANCHORED DIMENSION STONE CLADDING

horizontally.

A. Attach anchors securely to stone and to backup surfaces. Comply with recommendations in ASTM C 1242.

B. Provide compressible filler in ends of dowel holes and bottoms of kerfs to prevent end bearing of dowels and anchor tabs on stone. Fill remainder of anchor holes and kerfs with sealant indicated for filling kerfs.


C. Set stone supported on clips or continuous angles on resilient setting shims. Use material of thickness required to maintain uniform joint widths and to prevent point loading of stone on anchors. Hold shims back from face of stone a distance at least equal to width of joint.

3.3 SETTING DIMENSION STONE CLADDING WITH MORTAR

A. Set stone in full bed of mortar with head joints filled, unless otherwise indicated.

1. Provide compressible filler in ends of dowel holes and bottoms of kerfs to prevent end bearing of dowels and anchor tabs on stone. Fill remainder of anchor holes and kerfs with mortar.

B. Embed ends of sills in mortar; leave remainder of joint open until final pointing.

C. Rake out joints for pointing with mortar to depths of not less than 1/2 inch (12 mm)

D. Point stone joints by placing pointing mortar in layers not more than

. Rake joints to uniform depths with square bottoms and clean sides.

3/8 inch (10 mm)

E. Tool joints with a round jointer having a diameter

. Compact each layer thoroughly and allow to become thumbprint hard before applying next layer.

1/8 inch (3 mm)

F. Rake out mortar from sealant-pointed joints to depths of not less than

larger than width of joint, when pointing mortar is thumbprint hard.

1/2 inch (12 mm)

3.4 JOINT-SEALANT INSTALLATION

nor less than that required for sealant and sealant backing. Rake joints to uniform depths with square bottoms and clean sides.

A. Prepare joints and apply sealants of type and at locations indicated to comply with applicable requirements in Division 7 Section "Joint Sealants."

3.5 INSTALLATION TOLERANCES

A. Variation from Plumb: For vertical lines and surfaces of walls, do not exceed 1/4 inch in 10 feet (6 mm in 3 m) or 1/2 inch in 40 feet (12 mm in 12 m) or more. For external corners, corners and jambs within 20 feet (6 m) of an entrance, expansion joints, and other conspicuous lines, do not exceed 1/8 inch in 10 feet (3 mm in 3 m) or 3/8 inch in 40 feet (10 mm in 12 m)

B. Variation from Level: For lintels, sills, parapets, horizontal bands, and other conspicuous lines, do not exceed

or more.

1/8 inch in 10 feet (3 mm in 3 m) or 3/8 inch (10 mm)

C. Variation of Linear Building Line: For positions shown in plan, do not exceed

maximum.

1/4 inch in 20 feet (6 mm in 6 m) or 1/2 inch in 40 feet (12 mm in 12 m)

D. Variation in Joint Width: Do not vary from average joint width more than plus or minus

or more.

1/8 inch (3 mm) or a quarter of nominal joint width, whichever is less.


3.6 ADJUSTING AND CLEANING

A. In-Progress Cleaning: Clean dimension stone cladding as work progresses. Remove mortar fins and smears before tooling joints. Remove excess sealant and smears as sealant is installed.

B. Final Cleaning: Clean dimension stone cladding no fewer than six days after completion of pointing and sealing, using clean water and stiff-bristle fiber brushes. Do not use wire brushes, acid-type cleaning agents, cleaning agents containing caustic compounds or abrasives, or other materials or methods that could damage stone.

END OF SECTION 04851

Section 04810 Unit Masonry Assemblies Part 1

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Transcript of Section 04810 Unit Masonry Assemblies Part 1