FIELD: building industry and materials.
SUBSTANCE: invention relates to preparing wall constructive material based on secondary gypsum dihydrate. Raw mixture for preparing water-proofing building material comprises secondary gypsum dihydrate, slaked lime as saturated solution and microsilica as additive in the following ratio of components, wt.-%: secondary gypsum dihydrate, 70-80; microsilica, 5.5-6.5; slaked lime, 0.0135-0.019, and water, the balance.
EFFECT: improved preparing method.
1 tbl, 3 ex
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