Framing & StructuralQuestion 386 of 700

Traditional three-coat stucco applied over metal lath on a framed wall should have what approximate MINIMUM total nominal thickness measured from the face of the lath?

a.7/8 inch
b.3/8 inch
c.1/4 inch
d.1 1/2 inches

Explanation

Three-coat stucco (scratch, brown, and finish coats) is built to a nominal total thickness of about 7/8 inch measured from the face of the lath. 3/8 and 1/4 inch are far too thin for a three-coat system, and 1 1/2 inches is thicker than standard and unnecessary.

Law Reference: 2025 CA Residential Code §R703.7

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