Looking at trying my hand at tiling an outdoor shower/toilet (and if it goes well a laundry) which need some attention. There are 2 coats of some kind of thick waterproofing paint (I assume) on each, which has held up much better in the shower than the toilet. They are both external to the house, on a concrete slab, with rendered/painted brick walls.
My current thinking is hitting the toilet floor with a pressure cleaner to see how much loose paint I can lift, and then just tiling over the concrete/whatever paint is left (after scratching it up) with something like Davco SMP Evo Tile Adhesive and a 10-12mm thick travertine tile, grouting, then painting the walls.
For the shower I was thinking of leaving the existing paint in place as a waterproofing layer, maybe scratching it up slightly (possibly defeats the purpose of using a waterproofing layer) or using some kind of primer, raising the drain, and then doing the same tile as the toilet (but with a row around the base of the walls too), maintaining the slope towards the drain.
Just wondering if there are any thoughts around this approach? Things I could do differently? Any other primer/waterproofing products I should use in between the existing floor and the tile?
The stakes are low here, the shower is rarely used (might get used more if it was nicer), and it is all on concrete/brick with no timber involved in case of leaks etc (plus it is external).
Thanks!
