70 112 GYPSUM PLASTER OVER CONCRETE

May 1st, 2015
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Gypsum plaster may be used to decorate the interior side of concrete and masonry walls. This practice is centuries old in Europe and still practical today. The need for additional weatherproofing on the exterior side will depend on exposure to the elements, thickness of the wall and/or exterior cladding.

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70 112 GYPSUM PLASTER OVER CONCRETETechnical ServicesInformation BureauTECHNICAL BULLETINMARCH 200870.112Gypsum Plaster Over Concrete/Masonry SubstratesGENERAL DESIGN INFORMATION:Gypsum plaster may be used to decorate the interior sideof concrete and masonry walls. This practice is centuriesold in Europe and still practical today. The need for additional weatherproofing on the exterior side will depend on exposure to the elements, thickness of the wall and/or exterior cladding. Gypsum plaster provides sound absorbing and attenuationqualities to concrete and/or masonry walls. Gypsum plastermay be used to level a wall to provide a flat attractive surface. Gypsum plaster should not be applied in thicknesses over 3/4 of an inch without metal reinforcement (lath) to any substrate. For walls requiring more than 1 1/2 inch thick plaster, theTSIB suggests furring the wall out and applying lath.SKIM COAT:For substrates no more than 1/4 inch out of tolerance, askim coat of finish gypsum plaster may be used. The TSIBsuggests a veneer plaster for skim coating. Veneer plastermay be one or two-coat applications. Two-coat applicationsare typically done the same day. If the second coat isapplied more than 12 hours after the first coat, a bondingagent is recommended.CAVEAT: Gypsum plaster is not intended to be exposed tomoisture and/or high humidity for prolonged periods oftime. The TSIB suggests the use of Portland cement plasterover concrete walls and/or ma

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