I am very happy using them on 8x32 tile floors. However, when I tried them on a wall with a Schlueter Kerdi waterproof foam board, all the floor boards broke through the foam trying to break them. I had to cut them out of the joint between the tiles with a saw, leaving a moisture-resistant foam sheet with holes. Fortunately, this was not in an area where significant amounts of water would fall. Found a much better alignment system with interchangeable metal T-pins.
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