Quick AnswerCommon signs of water damage inside walls include discoloration or brown staining, paint that bubbles or peels, soft or bowing drywall, a persistent musty smell, and visible mold at baseboards or outlets. You may also notice warped trim or a spike in your water bill. Moisture meters confirm what the eye cannot see.
The tricky part is that walls can look fine while the cavity behind them stays saturated. Water wicks up drywall and into insulation, so the surface dries while the inside feeds mold. That is why a musty smell with no visible stain still warrants a moisture check.
Catching it early is the difference between a drying job and a demolition job. Once drywall is soft, insulation is wet, and mold has started, materials usually have to be removed rather than dried in place.
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