Quote:
Originally Posted by t walgamuth
I didn't read the whole blurb but it looked to me like that is for keeping moisture from going throught the porous tile and damaging the sub strate as in a tile over wood framing. It does not sound like it applies in your case.
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That is its primary function but it also serves as a shock absorber for small cracks, preventing them from migrating through the tile. It's an extra step - you have to put down a thin coat of thinset, then the s-Kerdi, and then the tile.