Hi I'm looking for some opinions on using cement based adhesive on gypsum plastered (skimmed) drywall? I'm doing my first paid tiling job (for a family member) she got all the material the supplier knew where the tile was to be fitted (plastered drywall) he supplied a cement based powdered adhesive It says on the bag "not to be used on gypsum based plaster" I asked him about this and he said its fine to use it he has sold tons of the stuff and never had a problem. My sister in law (the client) is happy enough to use it she says he should know what he is talking about, as it is his job. To make things worse there is a shower that is to be tiled and the substrate in the shower area is skimmed plasterboard (he says it is perfect for this as it is a flexible adhesive). I want to use ready mixed adhesive but am a bit unsure because the walls are studded walls not solid block walls and they will move a little. The supplier thinks I'm a donkey and my client thinks I'm over reacting. But it says on the bag it's not suitable. And I have researched it on the web and found something about some reaction between cement and gypsum. Should I just do the job with what he supplied and keep my opinions to myself?
- posted
19 years ago