A.Contributing editor Michael Byrne, a tile-setter and consultant in Los Olivos, Calif., and moderator of JLC Online's tile forum, responds: I use the same approach on plumbing fixtures without a tile lip as I use for plumbing fixtures with a lip.

Liquid waterproofing membranes that meet ANSI 118.10 specifications can be applied to the surface of many tile substrates, including cement-based backerboard, plywood, and concrete. Waterproofing membrane should be applied to setting-bed edges, too, and around any plumbing that penetrates the substrate.

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