How to Spot Hidden Moisture Behind Bathroom Tile Before Mold Takes Hold

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Before you see any mold, sniff for a musty smell or feel a cool, damp spot on the drywall. Look for dark discoloration in grout, peeling paint, or slight bubbling on the tile surface. If the shower wall sounds hollow when you tap it, there's likely moisture trapped behind. The real tell: press gently on the caulking near the base; soft, squishy seams mean water's already soaking the sheathing. Catching these small clues early—while the grout is still wet but not black—can spare you a full gut j…