illustration of bathroom tile floor construction
Illustration: Eric Larsen
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What Should Go Under a Tile Floor

Don't lay tile over plywood, which can swell with moisture and break the tile bond. If you're not pouring a new floor, mortar and screw ¼-inch backerboard over a level subfloor, then lay tile on top. Another option: Put in a DITRA flexible underlayment, which helps prevent cracks in ceramic and stone tile by evenly distributing the weight they carry.
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