NASCLA Accredited Commercial General ContractorWoodMedium
A commercial building project involves the construction of a large, open-span gymnasium. The structural design calls for custom-designed wood trusses with complex geometry to achieve the desired aesthetic and structural performance. Which of the following is a critical consideration for the contractor when handling and installing these specialized trusses?
- ATrusses can be field-modified by cutting or notching as needed to fit site conditions.
- BTemporary bracing must be installed to prevent instability during and immediately after erection.
- COnly standard lifting equipment is required, as truss weight is negligible.
- DTrusses should be stored directly on the ground to prevent warping.
Show answer & explanationAnswer & explanation
Correct answer: B. Temporary bracing must be installed to prevent instability during and immediately after erection.
Custom trusses, especially those with long spans, are susceptible to buckling and overturning during handling and erection. Temporary bracing is crucial to maintain their stability until permanent structural elements are in place.
Why the other options are wrong
- A. Field modifications to trusses without engineer approval are strictly prohibited and can lead to structural failure.
- C. Trusses, especially large custom ones, can be very heavy and require appropriate lifting equipment and techniques.
- D. Trusses should be stored off the ground and supported to prevent warping and moisture absorption.
Truss Erection Safety
Procedures and precautions required to safely and correctly install pre-engineered wood trusses in a commercial building.
- Temporary bracing is critical for stability during and after installation.
- Trusses must be handled carefully to prevent damage.
- Field modifications are prohibited without engineering approval.
Memory trick: Trusses are tricky, brace them quick, or disaster will stick.