What are the requirements on the permanent bracing of bottom chords? Can gypsum board diaphragms be used?
The National Design Standard for Metal Plate Wood Truss Construction (ANSI/TPI 1-1995) discusses bottom chord bracing in section 5.3.2. It is referenced in all the building codes as THE standard for MPCWT construction. So the answer is yes, gypsum board diaphragms can be used to brace the bottom chord of the truss. In high wind or seismic areas, the gypsum board may not be sufficient and properly restrained; therefore, continuous lateral reinforcement may also be required. Either way, this is something that the Building Designer needs to verify and design.
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