A.Tilesetter Tom Meehan, owner of Cape Cod Tile Works in Harwich, Mass., responds: The only way to install a curbless shower with adequate slope for drainage without raising the floor level higher than the finish floors in other rooms is to jackhammer the slab and drop the floor about 3 inches.

But if the homeowner is willing to compromise, you can install the tile without demolishing the existing slab. After installing the drain assembly, set flush with the slab, install a waterproof membrane like NobleSeal TS (Noble Company, 800/878-5788, www.noblecompany.com), bonded to the slab with thinset. Apply more thinset on the top side of...

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