CertainTeed’s FortiCel mold prevention system is a topical spray-on application that can be used on virtually any interior construction surface, including dimensional lumber, steel studs, concrete, and floor joists. Backed by a 25-year warranty, FortiCel dries in 20 minutes and will not wash off or degrade. This product achieves the highest rating when tested in accordance with ASTM D3273-94 specification regarding mold growth on lumber.
PB Topical Ref
