Discussion Starter · #1 ·
I recently removed part of the lathe & plaster wall in my kitchen. The plaster removed is grey & very heavy. Does anyone know what it is made from? (chemical composition) Could it contain cement or asbestos? The house is very old - knob & tube wiring. If the plaster is calcium sulfate like in patching plaster, I think I can use it to break up the horrible clay soil around the house.