The signs of a plumbing leak behind a wall include stains, paint that bubbles or peels, drywall that feels soft, loose tiles, and a musty smell. Some leaks also make a faint dripping or hissing sound.
What You May See
Water inside a wall often spreads before it shows. When it does, look for:
- Yellow, brown, or gray stains
- Bubbles or cracks in paint
- Swollen or warped baseboards
- Dark grout or loose tiles near a shower or tub
What You May Feel or Smell
Press lightly near a stain. Drywall that feels soft or cool may be wet inside. A musty smell that gets stronger near one wall is another sign. Small black or green spots near the floor can mean mold is starting.
When the Signs Appear
Timing can help narrow down the source. If the wall gets wet only when the shower runs, the drain or shower valve may be leaking. If it stays damp all the time, a supply pipe under constant pressure is more likely. If it gets worse after rain, the problem may not be plumbing at all.
Shared Walls in Buildings
In condo and apartment buildings, pipes often run through walls shared with neighbors or through common risers. A stain on your side may come from plumbing next door or above. Let your building staff know so the source can be traced.
Avoid opening the wall yourself. You could damage pipes or wiring and make the repair bigger. If you can identify the fixture involved, shut off its valve until the leak is found.
A plumber can narrow the leak down to one spot so only a small area of wall needs to be opened. For help, call JPR Plumbing at (833) 603-1840. Once the wall is closed up, a look at the other pipes in that wall can catch any weak fittings nearby.