Alpine

Bracing is extremely IMPORTANT!! Every roof system needs adequate bracing. The purpose of most bracing is to ensure that the trusses and truss members remain straight and do not bow out of their plane. Inadequate, improper or incorrectly installed bracing can lead to collapses, failures and serious accidents. An engineered bracing system will avoid these pitfalls and ensure the structural integrity of the truss system. Trusses need to be braced during installation, which is called Temporary Bracing, and they need Permanent Bracing which will remain installed for the life of the roof system. Temporary Bracing Guidelines: For metal plate connected wood truss systems, refer to BCSI 1-02 for proper installation bracing guidelines. For cold formed steel truss systems, refer to LGSEA's two publications, Field Installation Guide for CFS Trusses, and Design Guide for Construction Bracing of CFS Trusses. CHECKLIST FOR TRUSS BRACING CHECKLIST FOR TRUSS BRACING 32 ________________ ________________ _ _ ___________ ___________ Per Per manent Bracing System Checklist manent Bracing System Checklist ________________ ________________ _ _ ___________ ___________ 1. Top Chord Planes ¨ Do top chord planes have structural sheathing (plywood, OSB, metal deck)? ¨ If not, do you have a purlin system, with both purlins (perpendicular to the trusses) and diagonal bracing? Purlin systems can be used for standing seam roofs, or with structural sheathing applied on top of the purlins. Either way, a diagonal brace system must be engineered. Refer to sealed engineered truss designs for specified purlin spacing. 2. Web Bracing – be sure to reference sealed engineered truss designs for proper web bracing callouts. ¨ CLB Bracing crosses a minimum of 3 trusses, including diagonal bracing to "brace the bracing"? ¨ Properly installed T-Braces, L-Braces (especially on gable ends), Scab Braces, and other web bracing systems such as the Web Block? 3. Bottom Chord Planes ¨ Do bottom chord planes have structural sheathing directly attached? In many cases drywall is considered by the building designer to be lateral bracing, but in some cases it is not. ¨ If not, then you will need a purlin system, which can be attached to the top of your bottom chords, and those purlins will need diagonal braces. ¨ If you have any suspended ceilings, do you have a purlin system (including diagonal bracing) on the top or bottom of those bottom chords? 4. Additional Bracing Concerns ¨ Piggyback Systems – If you have piggyback systems, do you have a purlin system installed to support the bottom chord of the piggyback, as well as purlins and diagonal braces to ensure that the flat top chords of the hip trusses stay in plane? ¨ Valley Sets – Under the valley trusses, do you have structural sheathing, or other engineered bracing system for the top chords of the trusses underneath? Are the valley bottom chords adequately fastened down? ¨ High Heel Heights at a Wall – for trusses with heel heights greater than a nominal 2x6, is special heel blocking required and installed? ¨ Blocking For the Ridge in Hip Systems – Have you added blocks on the ridge between each hip truss (where a rafter or extended hip jack top chord doesn't extend to the peak of the hip system) to support the decking?

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