Symptoms
- Wall gives slightly or feels spongy when pressed
- May be paired with discoloration or a musty smell
- Often located near plumbing, windows, or exterior walls
Likely causes
- CommonOngoing or past plumbing leakA slow leak inside the wall gradually saturates and softens drywall.
- CommonWater intrusion from outsidePoor flashing around windows or siding can let water track into interior walls.
- PossibleRoof leak tracking down inside a wall cavityWater from the roof can travel and show up as a soft spot on a wall far from the actual leak point.
What to do
- Avoid pressing hard on the soft area, since it may not support weight.
- Look for a nearby plumbing line, window, or exterior wall that could be the source.
- Shut off water to any suspected plumbing source in that wall.
- Cut a small inspection opening if needed to check for active leaking or mold.
- Have the source of the water identified and repaired first.
- Remove and replace any wet or moldy drywall and insulation.
- Let the area dry completely before installing new drywall, and repaint once finished.
Tools and parts
- Utility knife
- Flashlight
- Moisture meter (optional)
Replacement drywallSearch: “drywall sheet for wall repair”
When to call a pro
Call a plumber or leak specialist to find the source, and a contractor for drywall replacement if mold or significant damage is present.
Safety
Use caution
Soft, wet drywall can also mean hidden mold; wear gloves and a mask when removing it, and ventilate the area well.