Patent ID: 8216360

Claim:
A method of producing gypsum building board, which method comprises producing an aqueous foam by: whipping water containing a foaming agent to produce an aqueous foam; mixing the aqueous foam with an aqueous gypsum slurry; and allowing a layer of the resulting mix to set so as to form a gypsum building board; characterized in that the foaming agent is at least one non-ionic alkylpolysaccharide foaming agent of the general formula (I) R—O-(G) x (I) where: R represents a linear or branched alkyl group having from 6 to 20 carbon atoms; G represents a reducing saccharide moiety connected to R via an ethereal O-glycosidical bond; and x is 1 to 10, said foaming agent being present in an amount to enhance the compressive strength of the gypsum building board.