Q: Is it okay to use Schluter's Kerdi material as a waterproofing membrane beneath a stone countertop? Because it's flexible, I plan to use it to cover the plywood substrate on top of the cabinets, and then turn it up the wall a few inches so that I can waterproof the area behind the planned tile backsplash at the same time.

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.

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