For tile, the substrate must be stable to prevent mortar bond failure and cracked grout lines. Concrete subfloors must be cured and free of moisture or cracking agents. Wood subfloors require sufficient thickness and a rigid underlayment like cement board to prevent floor flexion. Checking for a perfectly flat plane is critical for an even tile layout.
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What indicators confirm a subfloor is suitable for hard surface tile installation?
A suitable subfloor for hard surface tile must be clean, dry, level, and structurally rigid to prevent movement. It must have zero deflection, meaning it does not bounce or flex under weight, and should be free of cracks, oils, or loose contaminants that impede mortar adhesion.