18 Jul 2023
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United Kingdom
Hello all, getting round to renovating the bathroom in our 1909 solid wall red brick house (on first floor) - any advice on what should go behind tiles on an internal brick wall in a shower area (and external brick wall not in shower area)?

One tradesperson has said sand and cement render and that this would be waterproof - which I understand is correct if a waterproofing additive is added, is it waterproof by itself? I have heard about water getting behind people's external render and damaging brickwork, but presumably/hopefully different in an indoor tiled context?

Many thanks!
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