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Four Steps toSafe Truss Installations

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Presented by the Wood Truss Council of America

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Most Truss Collapses Are Caused By….

Inadequate Temporary Bracing

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4 Steps to Safe Truss Installations

1. Storage & Handling2. Temporary Bracing3. Construction Loading4. Fall Protection

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Jobsite Package Truss Documentation ‘HIB’ Guides

Handling, Installing & Bracing

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BCSI-B1 Summary Sheet Guide for Handling, Installing & Bracing

of Metal Plate Connected Wood Trusses

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Step 1 – Metal Plate & Banding Warning

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Step 1 - Jobsite Storage

Keep off the ground

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Step 1 - Long Term Storage

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Avoid Long Term Exposure

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Step 1 - Storage Conditions

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Step 1 - Handle with Care

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Step 1 - Hoisting

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Step 2 - Bracing Purpose of Bracing: To apply sufficient

support at right angles to the plane of the truss so as to hold every truss member in its design position.

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Can’t Support Lateral Loads

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Step 2 - Ground Bracing

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Step 2 - Bracing Three Planes

Lateral Brace

Diagonal Brace

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Step 2 – Top Chord Plane

ALWAYS Stabilize Lateral Braces with Diagonal Braces

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Insufficient Top Chord Bracing

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Spacer Pieces & No Diagonals!Can Lead to CompressionBuckling of the Top Chord

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Top Chord Temporary

Bracing with

Spacers

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Step 2 - Floor Truss Bracing

Lateral Brace Diagonal Brace

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Bowing or Tilting?

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Step 2 – SheathingSheathe early & often

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No Bracing!

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No Diagonals!

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Results of Bad Bracing

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Results of Bad Bracing

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Results of Bad Bracing

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Step 2 - Bottom Chord Bracing

Bottom Chord PlaneBottom Chord Plane

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Step 2 - Bottom Chord Bracing

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Step 2 - Bottom Chord Bracing

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Step 2 - Web Plane Bracing

Web PlaneWeb Plane

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Step 2 - Web Plane Bracing

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Gable End Bracing

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Step 2 – Permanent Web Bracing Locations

Compression Web BracingCompression Web Bracing

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Step 2 - Web Buckling

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Step 2 - Web Bracing

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Step 2 - Web Reinforcement

T-Brace

L-Brace MetalReinforcement

Scab Brace

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Step 3 - Construction Loads

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B4 Loading DOs and DON’Ts

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B4 Loading DOs and DON’Ts

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B4 Loading DOs and DON’Ts

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B4 Loading DOs and DON’Ts

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B4 Loading DOs and DON’Ts

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Loads with No Bracing!

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Dangers of Overloading

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Step 4 - Fall Protection

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Step 4 - Fall Protection A falling worker attached to a single truss

may cause the trusses to “domino”

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Step 4 – Pre-Assemble Units

Built it on the ground.

Sheath it for stability.

Pick it up and set in place.

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Step 4 - Scaffolding Personal fall arrest system to OSHA

guidelines

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Step 4 – Scaffolding?

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Step 4 - Roof Peak Anchors Sheath and brace a portion of roof and

install a roof anchor to OSHA guidelines

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BCSI Series

For more info on: Truss repairs Girders Fall protection Jobsite storage Truss handling Toe-nailing for uplift Temporary bracing Construction

loading

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WTCA is the Information Source

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Structural Building Components Magazine

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www.woodtruss.com

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WTCA Homepage

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Wood Truss Councilof America

wtca@woodtruss.com