cold formed steel construction details.pdf

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Low-Rise Residential Construction Details North American Steel Framing Alliance 1726 M Street, NW Suite 601 Washington, DC 200364523 2027852022 Fax: 2027853856 180079STEEL www.SteelFramingAlliance.com Publication NT600 First PrintingMarch 2000 Copyright 2000

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Cold Formed steel Construction Details.pdf

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Page 1: Cold Formed steel Construction Details.pdf

Low-Rise Residential

ConstructionDetails

North American Steel Framing Alliance1726 M Street, NW

Suite 601Washington, DC 20036�4523

202�785�2022Fax: 202�785�3856

1�800�79�STEELwww.SteelFramingAlliance.com

Publication NT6�00

First Printing�March 2000Copyright 2000

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Introduction

These details were developed by the Light Gauge Steel EngineersAssociation (LGSEA) for the North American Steel Framing Alliance(NASFA). They are intended to provide designers and contractors with guid-ance on design, detailing, and construction of low-rise residential buildings thatutilize cold-formed steel framing members. Details contained in this documentwere selected based on their cost effectiveness at the time of this publication.Efforts have been made to present accurate, reliable, and useful information.The connections between members are shown as screw connections; othertypes of connections such as welds, bolts, powder-actuated fasteners, clinches,or pneumatically driven fasteners are acceptable. Although it is common forcold-formed steel framing members to have web “punchouts” for passing brac-ing or utilities, punchouts are shown in some details only. Punchouts areacceptable and vary in size, configuration, and spacing depending on the manu-facturer and/or design. NASFA acknowledges Nader Elhajj, P.E., for assem-bling and drafting the details. Special appreciation is extended to Kevin Bielatof the American Iron and Steel Institute (AISI) and Tim Waite of NASFA fortheir assistance and guidance. NASFA recognizes the following LGSEA com-mittee members who helped select the details contained in this document:

Don Allen BLB ConsultingTim Waite North American Steel Framing AllianceScott Shaddix Nicholas Lane ContractorsMike Whitticar Enertech Systems, Inc.Pat Ford Matsen Ford Design Associates, Inc.Don Wilnau Independent ContractorThe materials set forth herein are for general information only. They are not

a substitute for competent professional assistance. Application of any informa-tion contained in this document to a specific project or setting should bereviewed by a qualified individual. NASFA believes that the information con-tained in this publication substantially represents industry practice and relatedscientific and technical information, but the information is not intended to rep-resent an official position of NASFA or to restrict or exclude any other con-struction or design technique. Additional design and detailing (i.e., coordinat-ing with other materials, material specifications) is required for many of thedetails before they can be incorporated into construction documents. Anyonemaking use of the information set forth herein does so at his or her own riskand assumes any resulting liability.

Table of Contents

Introduction ....................................................................................................iTable of Contents ............................................................................................iList of Details ................................................................................................iiDefinitions ....................................................................................................iv

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List of Details

GeneralDetail G1 Schematic of Typical Steel-Framed House ..........................1Detail G2 C-Shape Configuration ........................................................2Detail G3 Track Configuration ..............................................................2Detail G4 Joist Web Holes ....................................................................3Detail G5 Stud Web Holes ....................................................................3Detail G6 Joist Web Hole Patch ............................................................4Detail G7 Stud Web Hole Patch ............................................................4Detail G8 In-Line Framing Detail ........................................................5Detail G9 Web Stiffener Detail 1 ..........................................................6Detail G10 Web Stiffener Detail 2 ..........................................................6Detail G11 Web Stiffener Detail 3 ..........................................................7Detail G12 Track Splice Detail................................................................8Detail G13 Screw Attachment Detail ......................................................9

FloorsDetail F1 Floor Framing ....................................................................10Detail F2 Floor to Foundation Connection ........................................11Detail F3 Floor to Wood Sill Connection ..........................................12Detail F4 Floor to Load Bearing Wall Connection ............................13Detail F5 Floor Bearing on I-Beam Connection ................................14Detail F6 Lapped Joists ......................................................................15Detail F7 Continuous Joist..................................................................16Detail F8 Floor to I-Beam Side Connection ......................................17Detail F9 Joists Supported by Shallow I-Beam..................................18Detail F10 Joists Supported by Deep I-Beam ......................................19Detail F11 Floor Joists at Interior Bearing Wall ..................................20Detail F12 Joists Bearing on Foundation at Opening ..........................21Detail F13 Floor to CMU Wall Side Connection ................................22Detail F14 Web Stiffener at Load Bearing Wall ..................................23Detail F15 Alternate Pony Wall Detail ................................................24Detail F16 Cantilevered Joist to Foundation Connection ....................25Detail F17 Cantilevered Joist to Wood Sill Connection ......................26Detail F18 Cantilevered Joist to Bearing Wall Connection..................27Detail F19 Cantilevered Joist to Wood Top Plate Connection ............28Detail F20 Double Cantilevered Joists ................................................29Detail F21 Wood Deck Balcony ..........................................................30Detail F22 Beam Support with Column ..............................................31Detail F23 Beam Support......................................................................32Detail F24 Floor Opening Detail ..........................................................33Detail F25 Floor Header and Trimmer Detail ......................................34Detail F26 Floor Blocking Detail 1 ......................................................35Detail F27 Floor Blocking Detail 2 ......................................................36Detail F28 Floor Blocking Detail 3 ......................................................37Detail F29 Floor Blocking Detail 4 ......................................................38Detail F30 X-Bracing Detail ................................................................39Detail F31 Blocking Connection Detail................................................40Detail F32 Floor Sheathing Connection Detail ....................................41

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Load-Bearing WallsDetail W1 Wall Framing ......................................................................42Detail W2 Wall Framing Elevation ......................................................43Detail W3 Wall to Foundation/Slab on Grade Connection 1 ..............44Detail W4 Wall to Foundation/Slab on Grade Connection 2 ..............45Detail W5 Wall to Foundation/Slab on Grade Connection 3 ..............46Detail W6 Wall to Foundation/Slab on Grade Connection 4 ..............47Detail W7 Wall to Wood Sill Connection ............................................48Detail W8 Hold-Down Connection Detail 1 ........................................49Detail W9 Hold-Down Connection Detail 2 ........................................50Detail W10 Box Beam Header with Jack Stud ......................................51Detail W11 Box Beam Header ..............................................................52Detail W12 Back-to-Back Header with Jack Stud ................................53Detail W13 Back-to-Back Header..........................................................54Detail W14 L-Header Detail ................................................................55Detail W15 Single L-Header Detail ......................................................56Detail W16 Double L-Header Detail......................................................57Detail W17 Stud Bracing with Cold-Rolled Channel ............................58Detail W18 Stud Bracing with Sheathing ..............................................59Detail W19 Stud Bracing with Strapping and Sheathing ......................60Detail W20 Stud Bracing with Strapping and Blocking ........................61Detail W21 Structural Sheathing Fastening to Wall Studs ....................62Detail W22 Shearwall and Diaphragm Details ......................................63Detail W23 Sheathed Wall with Openings ............................................64Detail W24 Single Story X-Brace Detail ..............................................65Detail W25 Two Story X-Brace Detail ..................................................66Detail W26 Two Story Sheathed Wall Detail ........................................67Detail W27 X-Brace Detail ....................................................................68Detail W28 X-Brace with Gusset Detail ................................................69Detail W29 Corner Framing Detail ........................................................70

Non-Load Bearing WallsDetail NL1 Non-Load Bearing Wall Framing ......................................71Detail NL2 Sill and Head Track Connection Detail ..............................72Detail NL3 Corner Framing Detail ........................................................73Detail NL4 Slammer Stud Detail ..........................................................73Detail NL5 Window Opening Framing Detail ......................................74Detail NL6 Door Opening Framing Detail ............................................75Detail NL7 Non-Load Bearing Opening................................................76Detail NL8 Non-Load Bearing Wall Parallel to Joist ............................77

Roofs (Rafters/Joists)Detail R1 Roof Framing ......................................................................78Detail R2 Joist and Rafter Detail ........................................................79Detail R3 Roof Framing Isometric View ............................................80Detail R4 Heel Joint Connection Detail ..............................................81Detail R5 Ridge Member Connection Detail ......................................82Detail R6 Ridge Member with Coped Rafters ....................................83Detail R7 Roof Eave and Soffit Detail................................................84Detail R8 Rafter and Joist Bridging ....................................................85

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Detail R9 Collar Tie at Rafter Detail ..................................................86Detail R10 Rafter Brace Connection Detail ..........................................86Detail R11 Roof Framing with Wood Tail Extension ..........................87Detail R12 Wood Truss Bearing on Steel Wall ....................................88Detail R13 Collector Block Detail ........................................................89Detail R14 Non-Aligned Roof-Wall Framing ......................................90Detail R15 Hip Beam ............................................................................91

MiscellaneousFigure M1 Cabinet Blocking Detail......................................................92Figure M2 Wiring and Piping Installation Detail ................................92Figure M3 Stair Framing Detail............................................................93Figure M4 Stair Framing Detail 2 ........................................................94Figure M5 Stair Landing Detail ............................................................95Figure M6 Wind Sill Details ................................................................96

Definitions

Anchor: Metal rod, wire, strap, or bolt that secures structural members (such as joists and tracks) to its structural supports (such as foundation).

Axial Load: The longitudinal force acting on a member. Examples are the gravity loads carried by columns or studs.

Blocking: Solid block or piece of material placed between structural members to provide lateral bracing as in bridging and/or edge support for sheathing.

Bridging: Cross bracing or blocking placed between joists to provide lateral support.

C-Shape: A basic cold-formed steel shape used for framing members (such as studs, joists, headers, and rafters).It consists of a web, flange, and lip. It is also called a “C-section.”

Cantilever: An extension of roof or floor framing members without a direct support.

Ceiling Joist: A horizontal structural framing member that supports a ceiling and attic loads.

Clip Angle: An L-shaped short piece of metal (normally with a 90–degree bend). It is typically used for connections.

Continuous Joist: A joist that spans over interior supports.Collar Tie: Brace member used to brace roof rafters near the

top.Cripple Stud: A stud that is placed between a header and a

window sill (or jamb) or a windowsill and a bottom track to provide a backing to attach finishing and sheathing material.

Diaphragm: A roof or floor system designed to transmit lateral forces to shear walls or other vertical resisting elements.

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Flange: The part of a C-Shape or track that is perpendicular to the web.

Flat Strap: Sheet steel cut to a specified width without any bends. Typically used for bracing and transfer of loads by tension.

Floor Joist: A horizontal structural framing member that supports floor loads.

Gable End: Where the triangular upward extension of either sidewalls or the front walls of the house provide the endsupports for the two sloping roof planes.

Header: A horizontal built-up structural framing member used over wall or roof openings to transfer loads above the opening to adjacent vertical framing members.

Heel Joint: The connection between the roof rafter and the ceiling joist.

In-Line Framing: Framing method where all vertical and horizontal load carrying members are aligned when required to properly transfer loads.

Jack Stud: A vertical structural member that does not span the full height of the wall and provides bearing for headers. Sometimes referred to as trimmer studs.

King Stud: A vertical structural member that spans the full height of the wall and supports vertical loads and lateral loads. Usually located at both ends of a header adjacent to the jack studs.

Lip: The part of a C-Shape that extends from the flange at the open end. The lip increases the strengthcharacteristics of the member and acts as a stiffener to the flange.

Material Thickness (steel):The base metal thickness excluding any protective coatings. Thickness is now commonly expressed in mils (1/1000 of an inch).

Mil: A unit of measurement used in measuring the thickness of thin steel elements. One mil equals 1/1000 of an inch (e.g. 33 mil = 0.033 inch).

Multiple-Span: The span made by a continuous member having intermediate supports.

Non-Load Bearing Walls (non-structural walls): Refer to Walls.Overlap Joists: Two or more joists extending over a common

support where the end of one joist is fastened to the end of another joist.

Overhang: See cantilever.Punchout (or hole): An opening in the web of a steel-framing member

allowing for the installation of plumbing, electrical, and utilities. A punchout or hole may be made during the manufacturing process or in the field witha hand punch, hole saw, or other suitable tool.

Rafter: A structural framing member (usually sloped) that supports roof loads.

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Ridge: The horizontal line formed by the joining of the top edges of two sloping roof surfaces.

Shearwall: A vertical wall assembly capable of resisting lateral forces to prevent racking from wind or seismic loadsacting parallel to the plane of the wall.

Single Span: The span made by one continuous structural memberwithout any intermediate supports.

Splice: A joint at which two pieces are joined to each other.Span: The clear horizontal distance between bearing

supports.Structural Sheathing: The covering (e.g. plywood or oriented strand

board) used directly over structural members (e.g. studs or joists) to distribute loads, brace walls, and generally strengthen the assembly.

Stud: Vertical structural element of a wall assembly that supports vertical loads and/or transfers lateral loads.

Track: Used for applications such as top and bottom plate for walls and band or rim joists for flooring systems.A track has a web and two flanges, but no lips. Track web depth measurements are taken to the inside of the flanges.

Truss: An engineered structural component designed to efficiently carry its own weight and superimposed design loads. The truss members form a triangular structural framework.

Walls: Load Bearing: Wall systems subject to loads that exceed

the limits for a non-structural system (e.g. wall studs).

Non-Load Bearing: Wall systems that are limited to 10 psf maximum lateral (transverse) load and/or limited, exclusive of sheathing materials, to100 pounds per lineal foot or 200 pounds maximum superimposed vertical load per member (e.g. interior partitions).

Web: The part of a C-Shape or track section that connects the two flanges.

Web Opening: See “Punchout.”Web Perforation: See “Punchout.”Web Stiffener: Additional material that is attached to the web to

strengthen the member against web crippling. Also called a bearing stiffener.

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Detail G1Schematic of Typical Steel-Framed House

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Detail G2C-Shape Configuration

Detail G3Track Configuration

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Detail G4Joist Web Holes

Detail G5Stud Web Holes

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Detail G6Joist Web Hole Patch

Detail G7Stud Web Hole Patch

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Detail G8In-Line Framing Detail

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Detail G9Web Stiffener Detail 1

Detail G10Web Stiffener Detail 2

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Detail G11Web Stiffener Detail 3

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Detail G12Track Splice Detail

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Detail G13Screw Attachment Detail

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Detail F1Floor Framing

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Detail F2Floor to Foundation Connection

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Detail F3Floor to Wood Sill Connection

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Detail F4Floor to Load Bearing Wall Connection

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Detail F5Floor Bearing on I-Beam Connection

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Detail F6Lapped Joists

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Detail F7Continuous Joist

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Detail F8Floor to I-Beam Side Connection

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Detail F9Joists Supported by Shallow I-Beam

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Detail F10Joists Supported by Deep I-Beam

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Detail F11Floor Joists at Interior Bearing Wall

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Detail F12Joists Bearing on Foundation at Opening

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Detail F13Floor to CMU Wall Side Connection

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Detail F14Web Stiffener at Load Bearing Wall

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Detail F15Alternate Pony Wall Detail

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Detail F16Cantilevered Joist to Foundation Connection

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Detail F17Cantilevered Joist to Wood Sill Connection

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Detail F18Cantilevered Joist to Bearing Wall Connection

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Detail F19Cantilevered Joist to Wood Top Plate Connection

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Detail F20Double Cantilevered Joists

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Detail F21Wood Deck Balcony

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Detail F22Beam Support with Column

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Detail F23Beam Support

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Detail F24Floor Opening Detail

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Detail F25Floor Header and Trimmer Detail

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Detail F26Floor Blocking Detail 1

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Detail F27Floor Blocking Detail 2

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Detail F28Floor Blocking Detail 3

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Detail F29Floor Blocking Detail 4

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Detail F30X-Bracing Detail

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Detail F31Blocking Connection Detail

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Detail F32Floor Sheathing Connection Detail

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Detail W1Wall Framing

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Detail W2Wall Framing Elevation

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Detail W3Wall to Foundation/Slab on Grade Connection 1

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Detail W4Wall to Foundation/Slab on Grade Connection 2

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Detail W5Wall to Foundation/Slab on Grade Connection 3

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Detail W6Wall to Foundation/Slab on Grade Connection 4

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Detail W7Wall to Wood Sill Connection

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Detail W8Hold-Down Connection Detail 1

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Detail W9Hold-Down Connection Detail 2

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Detail W10Box Beam Header with Jack Stud

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Detail W11Box Beam Header

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Detail W12Back-to-Back Header with Jack Stud

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Detail W13Back-to-Back Header

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Detail W14L-Header Detail

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Detail W15Single L-Header Detail

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Detail W16Double L-Header Detail

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Detail W17Stud Bracing with Cold-Rolled Channel

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Detail W18Stud Bracing with Sheathing

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Detail W19Stud Bracing with Strapping and Sheathing

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Detail W20Stud Bracing with Strapping and Blocking

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Detail W21Structural Sheathing Fastening to Wall Studs

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Detail W22Shearwall and Diaphragm Details

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Detail W23Sheathed Wall with Openings

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Detail W24Single Story X-Brace Detail

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Detail W25Two Story X-Brace Detail

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Detail W26Two Story Sheathed Wall Detail

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Detail W27X-Brace Detail

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Detail W28X-Brace with Gusset Detail

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Detail W29Corner Framing Detail

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Figure NL1Non-Load Bearing Wall Framing

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Figure NL2Sill and Head Track Connection Detail

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Figure NL3Corner Framing Detail

Figure NL4Slammer Stud Detail

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Figure NL5Window Opening Framing Detail

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Figure NL6Door Opening Framing Detail

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Figure NL7Non-Load Bearing Opening

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Figure NL8Non-Load Bearing Wall Parallel to Joist

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Detail R1Roof Framing

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Detail R2Joist and Rafter Detail

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Detail R3Roof Framing Isometric View

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Detail R4Heel Joint Connection Detail

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Detail R5Ridge Member Connection Detail

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Detail R6Ridge Member with Coped Rafters

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Detail R7Roof Eave and Soffit Detail

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Detail R8Rafter and Joist Bridging

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Detail R9Collar Tie at Rafter Detail

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Detail R10Rafter Brace Connection Detail

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Detail R11Roof Framing with Wood Tail Extension

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Detail R12Wood Truss Bearing on Steel Wall

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Detail R13Collector Block Detail

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Detail R14Non-Aligned Roof-Wall Framing

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Detail R15Hip Beam

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Figure M1Cabinet Blocking Detail

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Figure M2Wiring and Piping Installation Detail

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Figure M3Stair Framing Detail

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Figure M4Stair Framing Detail 2

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Figure M5Stair Landing Detail

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Figure M6Wind Sill Details

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North American Steel Framing Alliance1726 M Street, NW

Suite 601Washington, DC 20036�4523

202�785�2022Fax: 202�785�3856

1�800�79�STEELwww.SteelFramingAlliance.com