Expert Answers in
Ceramic and Porcelain Tile
cracks
Debonding Tile
failures
Grout
Hollow Sounding Tiles
Movement Joints
Standards
Why is Ceramic Tile Hollow and Grout Cracking on New Floor?
ANSWER – When there is ceramic tile or stone failures it is normally due to compounding issues.
There could be excessive movement beyond the industry limit of L/360 deflection, but your subfloor description sounds substantial.
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