Q: Using a heat gun is an approved method for removing cured epoxy grout from tiles and fixtures [see Q&A, 5/08]. But can the same technique be used when the tile has been installed over Schluter’s Kerdi waterproofing membrane, or would the heat damage the membrane?
Q: When installing stone tiles over Schluter's Kerdi waterproofing membrane, is it okay to use modified thinset mortar? I know that Schluter recommends unmodified thinset mortar, but my supplier suggests that the large and heavy tiles will be easier to install with a polymer-modified no-sag mortar.
Why you should use an uncoupling membrane with tile rather than a regular waterproofing membrane, which is fine for stone slabs.