Signs of Water Damage Behind Walls
Water damage inside wall cavities isn't always visible. Here's how to spot the signs before the damage spreads.
Not all water damage is obvious. A slow leak inside a wall cavity can let water into drywall, insulation, and framing for days or weeks before it's visible on the surface. By the time you see a stain, the damage inside the wall may be more extensive. Knowing the early signs helps you catch hidden water damage before it grows.
Discoloration and stains
Yellow or brown stains on walls or ceilings are a common sign of water intrusion. The stain may grow over time or appear after rain. Even a small stain can indicate a slow leak behind the surface.
Odor
A persistent musty smell, especially in one area, can indicate moisture inside a wall cavity. Because mold can grow on damp materials within a day or two, a musty odor that doesn't go away is worth investigating.
Swelling, warping, or soft spots
Drywall that has absorbed moisture may swell, bow, or feel soft to the touch. Baseboards may pull away from the wall or warp. These are signs that moisture has been present long enough to change the material.
Peeling paint or wallpaper
Paint or wallpaper that bubbles, peels, or cracks can indicate moisture behind the surface. As moisture moves through drywall, it breaks the bond with paint and wallpaper.
What to do if you spot these signs
If you notice any of these signs, request a professional assessment. Moisture meters can detect water inside wall cavities without opening the wall, and the source of the moisture can be identified before it causes more damage.
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