Schluter-Ditra understands that tile, being a hard, brittle substance, expands and contracts due to moisture and temperature related conditions, at a totally, different rate from whichever substrate material lies beneath, be it plywood, concrete, cement, etc. This can be a problem when using traditional, thin-set mortar bed applications, which bond the tile directly to the supporting structure. The result is usually cracked, ruined tiles. In order to ensure both layers can move independently, an additional layer in between the two materials, is a must-have. (And no, you can’t just lay any, random thing down. Just in case someone out there is thinking, “Huh. I don’t see any reason I couldn’t use this old comforter.”) The Schluter-Ditra Universal Underlayment is the better option. Read More