Forum Title: Wallboard Circa 1945

Ran across a wallboard type that I had never seen before (fairly new to the industry). It is in a home built in 1945. The wallboard appears to be a multi-ply engineered product (i.e., no way this was layered/assembled on site). The layering of the product (from inside the wall out) is as follows: a (brown) paper backing ... approx 3/8 section of what appears to be gypsum ... another (thin) brown paper layer ... approx 5/16 of what appears to be concrete ... then approx 1/8 plaster as the outer presentation layer. The layers are integrated - as I mentioned, this is definitely an engineered product. Questions: 1) What is this material? 2) Any risk that this material contains asbestos? 3) Does the concrete layer provide any R-value? Many thanks for any offered insight. Caligula

Category: Drywall Post By: JOY TERRY (Evansville, IN), 03/19/2018

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