B_-_D_I-General

8/11/2019 B_-_D_I-General

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General Provisions

AISI North American Specification

Design Specification for All Cold-Formed

Steel

Standard Commentary


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ANSI Accredited Standards

General

Provisions

Header

Design

Truss

Design

Prescriptive

Method

Prescriptive Method (Standard)

Design provisions developed by a ANSI-Accredited Consensus Group and IndustryExperts

Goal: Promote Standardization and

Reduce Engineering Time and Costs

Audience: Engineers, Architects, CodeOfficials and Inspectors, Builders, andFramers


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Development of Prescriptive

Method

CFS In Building Codes


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Maximum House Width: 40 feet

Maximum House Length: 60 feet

Two Stories Above Grade

Maximum Wall Height is 10 feet

130 mph Maximum Wind Speed (exposures A, B or C)

70 psf Maximum Ground Snow Load

Seismic Design Categories A, B, C, D, D1, D2 and E

Rafters and Ceiling Joists

PM: Limits of ApplicabilityTable A1-1

Page 11

PM: Limits ofApplicability

60

24

40

10

1212

10 psf DL

30 or 40 psf LL

10 psf DL

30 or 40 psf LL

Below

Grade

10

130

MPH

70 psf

5 psf DL

10 or 20 psf LL


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Steel Properties and IdentificationSteel Properties and Identification

(industry-wide standard)

Member Designations

Standardization of member sizes and material

properties for generic sections

Member depth expressed in 1/100th inches

A single letter designator to represent the type of

section

Flange width expressed in 1/100th inches

Minimum base metal thickness in mils

(1/1000th of an inch = 1 mil)


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Section Designators

S T U F L

Stud or joist Track Cold

rolled

channel

Furring

channel

Angle

or L-

header

Thickness Designators

250.01818

220.02727

100.118118

120.09797

140.06868

160.05454

180.04343

200.03333

Reference

Gauge

Number

Minimum

Thickness

(inch)

Thickness

Designation

(mil)


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Designator

800 S 162 - 54

Min. base metal thickness in mils

(0.054 = 54 mils or 16 G.)

1-5/8 Flange in 1/100 inches

Stud or Joist with Stiffener

8 Member Depth in 1/100 inches

Note: The Lip is not indicated in the

designator because it is standardized

as a function of the flange width.

Standardization

800 S 162 - 54Min. base metalthickness in mils(0.054 = 54 mils)

Stud or Joist

with Lips

1-5/8Flange(1.625)

Steel Member Using the Universal

Designation System


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Member Dimension

2.001-5/87.25725S162-

2.001-5/812.001200S162-

2.001-5/810.001000S162-

2.001-5/89.25925S162-

2.001-5/88.00800S162-

2.001-5/86.00600S162-

2.001-5/85.50550S162-

2.001-5/83.50350S162-

Maximum

Flange Width(inch)

Minimum

Flange Width(inch)

Web

Depth(inch)

Member

Designation

Note: The Lip is not indicated in the designator because it

is standardized as a function of the flange width.

Corrosion Protection

ASTM Referenced Standard

GF45AZ50G40Non-

Structural

GF60AZ50G60Structural

A 875

A 875M

A 792

A 792M

A 653

A 653M

Coating Weight

(oz/ft2)Framing

Component


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Copper Pipes

Plastic bushing or

grommets

Corrosion Protection

AISIs Publication Durability of

Cold-Formed Steel Framing

Members

American Galvanizers Association

Publication Galvanizing ForCorrosion Protection - A Specifiers

Guide

FEMAs Publication Corrosion

Protection for Metal Connectors in

Coastal Areas


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Field Identification

Load bearing members shall be labeled(stamp, stencil or embossment) with:

Manufacturer Identification

Minimum uncoated base metal thickness

Minimum coating designation

Minimum Yield Strength

Note: This labeling is required at 48 oc

Coating Designation Not Required Unless

Coating is Other Than The Minimum

Typical

Old Label

New Label


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Identification: New Label

Requirements for ScrewConnections

minimum of 3 exposed

threadsminimum edge

distance = 1/2

minimum center-to-

center distance = 1/2


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Screws: Wood StructuralSheathing to Steel

Heads Countersunk Minimum No. 8

Note: The drill shank must

be as long as the wood

sheathing to allow the

drilling action in the steel

to take place without over

driving the screw headinto the plywood.

Screws: Gypsum Board to Steel

Minimum No. 6 Screw (drywall screw) for 33 mil Studs.

No. 8 Screws for 43 and 54 mil Studs.

Installed According to Applicable Building Codes

Pneumatic pins are available for this application


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Holes and

Penetrations

permitted provided they meet theprovisions in the PM

Joist Penetrations


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Stud Penetrations

Large HolesLarge Holes

permitted provided

they are ProperlyDesigned


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Large Holes

Hole and PenetrationPatches

Joist Patch

Patches allowed for

holes:

up to 70% of the

web depth.

less than 10 long

or the depth of theweb.


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Hole and Penetration

Patches

Stud Patch

Patches allowed for

holes:

up to 70% of the

web depth.

less than 10 long

or the depth of the

web.

In-Line Framing

Fundamental

Requirement for

Cold-Formed Steel

Framing: All Steel

Members Shall Align

Vertically with aMaximum Tolerance

of 3/4. Otherwise

load distribution

member (such as

top plate) must be

designed to carry


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In-Line Framing

Grommet

Wiring


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Use Full Batts

(Do Not Use Batt Insulation That Is Used For

Wood Framing)

Cavity Insulation

Exterior

Insulation

When

Needed

Exterior Insulation


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Field Inspections (what to look

for)

Materials / Identification and VerificationAllowable Penetrations

Field Cuts

Fastener Installation

Proper Corrosion Protection

In-Line Framing

see LGSEA Tech Note

Inspection Checklist for Structural Cold-Formed Steel Framing

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