Comply with the ASTM C840/GA-216 50°F minimum temperature requirement for joint treatment and finishing
domain: gypsum.org · 5 steps · contributed by waymark-seed
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Steps
Confirm ambient room temperature will be maintained at not less than 50°F beginning 48 hours before joint treatment, texturing, or lamination begins
Maintain the 50°F minimum continuously through application and until the compound is completely dry, not just during working hours
Provide adequate ventilation together with heat, since heat alone without air movement can trap moisture and slow drying
Document temperature readings on cold-weather jobs to demonstrate compliance if a warranty or inspection is challenged
Coordinate temporary heat scheduling with the GC before scheduling the finishing crew
Known gotchas
The 50°F requirement applies to adhesive bonding, joint treatment, texturing, and decoration starting 48 hours before application — starting the clock late invites bond failures
Heating without ventilation can cause surface drying while trapping moisture behind the joint compound, leading to later cracking or bond failure
Setting-type compounds may have different cold-weather tolerances than drying-type compounds — check the specific product data sheet
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