If the end of the cantilever supports a non-loadbearing non-shear wall, then the maximum overhang length is limited to one-fourth of the joist span (Figure 3, below).Ĭonsult manufacturer’s recommendations if using I-joists. The cantilevered joist must be located directly over studs unless the top plates are designed to carry the loads. When designed for additional loads, cantilevers are limited to 4 times the depth of the joist (Figure 2, below). For example, the Engineered Design provisions for sawn lumber floor joists in 2.3.1.6 state the maximum overhang length is limited to the depth of the joist if the end of the cantilever supports a load bearing wall or shear wall (Figure 1, below). The designer seeks to find the worst combination of loading that will impose maximum shear, bending, or deflection in the member.Īmerican Wood Council’s 2001 Wood Frame Construction Manual has engineered and prescriptive provisions that may give guidance for typical cantilever cases. Because the system is composed of two pieces: the cantilever span, and the back span, the placement and magnitude of load on these sections singly or combined will cause different stresses to develop in the member. Often the load is not a single uniform distribution over the length of the member, and other additional loads are present, such as point loads at the end of the member. Design of cantilever beams involves many variables including load, cantilever span and interior or back span. An engineer or architect should design cantilever members.
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