Roof trusses that are too long

Structure · Trusses · printed page 81 (PDF page 82)

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Book index entries

Roof – too Long Roof – Truss Trusses – Roof

Text in the illustration

if a truss is too long the top chord will not be sitting on the wall, but on a cantilevered part of the bottom chord
this is not desirable because high localized stresses can develop in this area
this end of the truss has proper bearing
wall studs

Generated explanation

The illustration shows a wood roof truss spanning two stud-framed walls, with metal connector plates at its chord and web joints. At the left end, the truss heel extends beyond the supporting wall, so the top chord bears on a cantilevered portion of the bottom chord rather than directly over the wall. Arrows and a dashed circle highlight this offset load path, where the annotation warns that high localized stresses can develop. The right end is circled and identified as having proper bearing, providing a comparison with the improperly supported left end.

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