Is tile over gypsum in showers with modern membranes still a no‑go, and why?
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Gypsum falls apart if it gets wet, even with sealant. Cement board or foam is safer because they don’t weaken if they get damp.
Tile over gypsum in showers with modern membranes is still not recommended, and it’s because Gypsum board tends to absorb moisture, which can lead to mold growth, weakening of the board, and damage to the surrounding structure.