A.Sean Gerolimatos, technical services manager for Schluter Systems, responds: Yes, the Kerdi waterproofing membrane (800/472-4588, www.schluter.com) would be suitable for this application.

However, if you were planning to install tile on the countertop instead of the stone slabs, I would recommend using Schluter's Ditra uncoupling membrane instead. This is because stone slabs are basically self-supporting and are not as sensitive as tile to the inherent dimensional instability of the plywood deck. Ditra would provide better...

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