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The Problem Most homeowners in London think that tile and grout are waterproof. They aren't. Grout is porous, and over time, water will get behind your tiles. If your contractor used old-school drywall or "green board," you are looking at a mold disaster in 5-10 years. At 519 Home Repair, we do things differently. ​ Section 1: What is the Schluter-Kerdi System? Schluter is the "Orange System" you see on professional job sites. It uses a polyethylene membrane (Kerdi) that is a