Framing & StructuralQuestion 338 of 700
Engineered rim board is often chosen over solid sawn lumber at the perimeter of an I-joist floor mainly because it:
a.Is always cheaper
b.Needs no fasteners
c.Is fire-rated by itself
d.Matches the depth of the I-joists and provides consistent, rated vertical load transfer around the floor
Explanation
Engineered rim board is manufactured to match I-joist depths and to carry the rated vertical and lateral loads uniformly around the floor perimeter, avoiding the shrinkage and depth-mismatch problems of solid lumber. Cost, fastener-free installation, and inherent fire rating are not the governing reasons.
Law Reference: 2025 CA Residential Code §R507.5Practice all 700 questions free — no signup required.
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