I renovate an old house; the door surround is in granite ashlar, exterior and interior sides. The inner side is covered with plaster, whose bottom has blistered (uninhabited house a few years, without heating). Can we rest plaster, directly on the cut stone?
Both granite and calcareous stone can be plaster-coated, provided that they are rough enough to allow the plaster to stick. This is the reason why so many beautiful sized stones were once slaughtered by hammering... If your doorway was already coated, the stone must be hammered. Remove any stubborn or stubborn plaster, brush it, moisten the stone and rest your plaster. this should hold without problem.
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