Framing & StructuralQuestion 446 of 700
When metal lath is applied to a wood-framed wall to receive three-coat cement plaster, the lath fasteners should penetrate the framing members by at least approximately how much?
a.1/8 inch
b.1/4 inch
c.3/4 inch
d.No penetration into framing is needed if the sheathing holds the lath
Explanation
Lath must be firmly anchored so the heavy plaster does not sag or crack; fasteners should penetrate the supporting framing by about 3/4 inch. Penetrations of 1/8 or 1/4 inch are too shallow to hold the load, and relying on sheathing alone without engaging framing leaves the lath inadequately secured.
Law Reference: 2025 CA Residential Code §R703.7Practice all 700 questions free — no signup required.
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