![]() The IBC becomes the governing code for the truss design and associated load paths if the structure falls outside of these limits (See IRC R301.1.3). ![]() Maximum ground snow load of 70 psf (3352 Pa), with roof snow load, computed as 0.7p g.Maximum design wind speed of 140 miles per hour (63 m/s), Exposure B or C.Building width not greater than 60 feet perpendicular to the truss span. ![]() The limits that apply when snow loads control the design are: These must be followed in order to stay within the purview of the IRC. The applicability limits for trusses are found in Section R802.10.2.1. The IRC does not have prescriptive provisions for the design and installation of prefabricated wood trusses, but they are allowed per Section R801.10. For those elements that fall outside of the prescriptive criteria, engineering design (i.e., using the IBC) is required (See IRC R301.1.3). The International Residential Code (IRC) is the governing code for one- and two-family dwellings. If a building falls within the IRC, all roles can be played by non-engineers, unless the jurisdiction requires the construction documents to be prepared by a Registered Design Professional. This article discusses the scope of work required of the various roles as defined by the various codes and standards for residential roof truss. Engineers can play various roles in this process, and it is essential to understand which role you play. There are many roles played in the design and delivery of residential wood roof trusses. This article outlines the related 2018 International Residential Code (IRC) and the 2018 International Building Code (IBC) requirements for residential truss engineering and delivery.
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