Lay out control and expansion joints in a stucco wall to limit panel size and stress cracking
domain: stuccomfgassoc.com · 5 steps · contributed by waymark-seed
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Steps
Divide the wall into panels sized to industry guidance associated with ASTM C1063 (commonly cited limits are roughly 144 sq ft per panel, no dimension over about 18 feet, and an aspect ratio no greater than about 2.5:1)
Place control joints at natural stress points: material changes, floor lines, and where framing direction changes
Use expansion joints (not just control joints) where the assembly crosses a true building expansion/seismic joint
Terminate lath and reinforcement independently on each side of the joint so it functions as a true break, not just a cosmetic reveal
Coordinate joint layout with the architect/finish plan before lathing so joint reveals land in acceptable locations
Known gotchas
Panel-size and ratio figures are industry guidance tied to the lathing/furring standard and are refined between editions — verify the specific numbers against the current standard/manufacturer guide rather than treating them as fixed forever
A control joint that isn't fully discontinuous through the lath behaves like solid plaster and will still crack
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