Building Envelope News

Plaster History and Cracks

Category: Building Envelope
Original date published: 2010-01-10

Hardcoat stucco”, also known in some areas as “two or three-coat stucco”, though porous, is a waterproof, cementitious composite when mixed, applied, cured properly over a sound substrate.  However, when improperly applied over an unsound substrate, it can cause cracks to occur making the system subjective to leaks. This is also true when assembling a one-coat stucco system, a system generally consisting of a thinner plaster finish (approximately 3/8” rather than 7/8” thick) applied over a substrate such as polystyrene.


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