This SBCA Research Report (SRR) examines the application of live loads to the bottom chord of trusses for uninhabitable attics in accordance with the International Residential Code (IRC) Table R301.5 and the International Building Code (IBC) Table 1607.1 and ASCE 7-10 Table 4-1. The truss industry is currently employing ASCE as its source for the correct loading of trusses. Correct loading is key to proper truss design and results in safer trusses, better truss performance and ultimately lower costs. However, there currently is a discrepancy regarding concurrency of bottom chord live loads between ASCE 7, the IBC and the IRC.
This legacy SBCA Research Report represents information and code requirements current as of the publication date shown. However, codes and standards change periodically. The user is encouraged to verify the referenced information is still current and conforms to current code requirements.
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