Why Is My Drywall Soft and Crumbling Near the Floor?

Water finds its way to the lowest point, which is often your wall's baseboard and floor. Common culprits include plumbing leaks from pipes within walls, failed toilet seals, or overflowing fixtures like sinks. Exterior water intrusion from foundation cracks or poor drainage can also lead to moisture wicking up the wall from the floor slab.

Appliance failures are another frequent cause. A leaking water heater, washing machine supply line, or dishwasher can flood a floor. Slow, persistent leaks from air conditioner drain lines or refrigerator ice makers are particularly sneaky, as they can go unnoticed for a long time while steadily damaging the drywall.

Your first priority is to stop the water source if it's still active. Locate the main water shutoff valve for your home. If the leak is from an appliance, turn off the water supply to that specific fixture. For leaks you can't immediately identify or stop, contacting a plumber is a critical next step.

After stopping the water, you can begin to minimize damage. Move furniture and belongings away from the wet wall. If safe to do so, remove any wet baseboards to improve air circulation. Use towels to soak up standing water on the floor. Do not attempt to dry the wall with heat, as this can trap moisture inside.

The cost to repair soft, crumbling drywall depends heavily on the size of the affected area, the extent of hidden damage, and whether flooring or framing also needs work. Repairs often range from several hundred to a few thousand dollars. The final price depends on labor, materials, and the drying time required.

If the cause is a sudden, accidental event like a burst pipe, your homeowner's insurance may help cover the cost of repairs. You should document the damage with photos and contact your insurance agent to start a claim. Policies vary, and your insurer decides what is covered.