We are fitting a bathroom and have tiled the shower area. My wife went to b uy BAL grout today and noticed it said it was suitable for showers but was water resistant not waterproof. So.... She called their technical support. They said it should only be used on the wall the shower is on if the wall h as been tanked/ waterproofed (using some waterproofing paint) first.
Is this correct as I have never heard of this before? Also.... We have now fitted the tiles with their adhesive which seems to say the same thing (ie for showers but only water resistant).