Framing & StructuralQuestion 455 of 700
Behind most exterior siding on a wood-framed wall, the code requires a water-resistive barrier equivalent to at least what?
a.One layer of No. 15 asphalt felt or an approved equivalent
b.Three layers of building paper
c.A continuous rigid steel sheet
d.No barrier as long as the siding laps are caulked
Explanation
The minimum water-resistive barrier is one layer of No. 15 asphalt felt or an approved equivalent house wrap, lapped to shed water. Three layers exceed the general minimum, a steel sheet is not a required WRB, and caulked laps alone do not replace a continuous barrier behind the siding.
Law Reference: 2025 CA Residential Code §R703.2Practice all 700 questions free — no signup required.
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