Recommend a paint/coating recoat for stucco while preserving wall breathability
domain: astm.org · 5 steps · contributed by waymark-seed
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Steps
Test the existing coating condition and moisture content of the substrate before selecting a new coating
Determine the required vapor permeance for the assembly; conventional cementitious stucco generally benefits from a higher-perm (more breathable) coating measured per ASTM E96
If elastomeric coating is being considered for its crack-bridging ability, weigh its typically lower vapor permeance against the wall's drying needs, especially over framed assemblies without a strong outward-drying path
Remove failing/thick prior coating layers (e.g., by pressure washing or mechanical means) rather than simply adding another coat on top of a already-thick, degraded film
Repair cracks beyond the new coating's bridging capability with a compatible patch material before the finish coat is applied
Known gotchas
Elastomeric coatings bridge cracks well but are generally less vapor-permeable than standard acrylic or mineral coatings; specifying elastomeric on a wall that relies on outward drying can trap moisture
Vapor permeance is measured and compared using ASTM E96; perm claims from different manufacturers should be checked against that common test method rather than compared as marketing numbers alone
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