How do we put tiles on shower walls to put over the top of old walls.m
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Mar12446149
we want to put tiles on the 3 walls in shower, over the older walls, one has a window halfway up it , mostly due to the window being there, make it water proof and mildew proof?
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It depends on the composition of the older walls. I would suggest taking out the older walls, and replacing with a concrete product made for showers, such as Dur-Rock.
To get a really nice result, I suggest taking down the old tiles and any plasterboard behind them. Instead of plasterboard, which is not waterproof and not recommended for wet walls, install cement board available at big box stores. This comes in sheets like plywood and provides a great base for the tiles. Here's a guide to help you get started: https://homeguides.sfgate.com/tear-out-replace-bathtub-tile-59223.html.