Manage moist-curing between stucco coats and adapt practice for hot or dry weather
domain: astm.org · 5 steps · contributed by waymark-seed
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Steps
Moist-cure the scratch coat for the minimum period required (commonly cited as roughly 48 hours) before applying the brown coat
Moist-cure the brown coat similarly, then allow it to dry out for the manufacturer/C926-specified period (often cited in the range of about 7 to 14 days for cement finish coats) before finishing
In hot, dry, or windy conditions, fog or lightly wet the wall multiple times a day to prevent premature drying and shrinkage cracking
In cold weather, do not moist-cure in a way that allows standing water to freeze on the surface; protect fresh plaster from freezing per the cold-weather practice
Document curing dates and weather conditions on site logs for quality control and warranty purposes
Known gotchas
Skipping moist-curing in hot/dry climates is a leading cause of map-cracking; garden-hose fogging schedules should be written into the daily crew plan, not left to memory
Curing duration recommendations vary between the base ASTM specification and individual manufacturer data sheets for proprietary finishes — the more restrictive of the two governs
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