He now wants to gut the kitchen and completely refit it, and is talking about stripping all the plaster ( 3" of it ) off, and putting up some kind of dampproof membrane before having it replastered. This is because last year he found damp penetrating the kitchen wall, caused by a new crack in the render: it's all sorted now, but he doesn't want a repeat performance after the kitchen is fitted out.
To this end, he is proposing using some stuff he saw at Wickes: you paint it on as a sort of bitumastic film, then throw dry sand on it whilst it's wet to provide a key for the plaster.
Anyone used this stuff? Is it suitable for my brothers' intended use? Could it exacerbate problems if there is a penetrating damp problem again? Any insights appreciated,