Wet carpet after a leak: what can be saved

Three questions decide it

Whether wet carpet can be saved comes down to three things:

1. How clean was the water? A supply line or a rain leak starts clean. A washing machine drain, a dishwasher or a toilet bowl is gray water. Sewage and outside floodwater are black water.
2. How long has it been wet? Clean water left sitting for a couple of days in a warm house starts to support mold and bacteria, and the category effectively worsens.
3. What is underneath? Carpet over a wood subfloor on a second floor dries differently from carpet over a concrete slab, and both differ from carpet over a crawl space.

Clean water caught early

This is the best case, and carpet usually survives it. Water is extracted with a truck-mounted or portable unit, often with a weighted tool that squeezes the pad. The carpet is lifted from the tack strip at a corner, the wet pad is cut out and removed, and the carpet is dried on both sides with air movers blowing underneath it while dehumidifiers run. Once the subfloor reads dry, new pad goes down and the carpet is re-stretched and seamed back in place. Some crews dry the pad in place on very small, very fresh leaks, but replacing it is cheap insurance.

Gray water: washer, dishwasher and toilet overflows

When the water came from an appliance drain or a toilet bowl without waste in it, the pad is thrown out under the industry standard. The carpet may be saved if it is extracted promptly, cleaned and sanitized, and dried quickly, but older carpet often is not worth the effort. The toilet overflow page explains where the line falls.

Black water: sewage and floods

Carpet and pad that sewage or outside floodwater reached are removed and discarded, along with the tack strip. There is no reliable way to disinfect the fibers and backing. Sewage cleanup and flood damage cleanup cover what happens next.

Delamination and shrinkage

Carpet has a primary backing the fibers are tufted into and a secondary backing glued to it. Soaking can weaken that bond, and when the layers separate the carpet ripples and will not lie flat, even after re-stretching. Some carpet also shrinks slightly as it dries, pulling away from the walls. Both are reasons carpet gets replaced even after a clean-water leak, and both are worth noting for an insurance claim.

The subfloor under the carpet

Pulling the pad usually reveals water on the plywood or OSB subfloor, and sometimes in the joists below. That has to be dry before new pad goes down, or the smell and mold return under the new carpet. Over a crawl space, check underneath too: water that soaked through a first-floor subfloor often wets the insulation below. On a slab, moisture can linger in the concrete and needs readings, not a guess.

What to do in the first few hours

• Stop the source and photograph the wet area before anything moves.
• Lift furniture off the wet carpet, or slide plastic or foil under the legs so stain and rust do not transfer.
• Pick up rugs and anything on the floor that can bleed dye.
• Use a wet-dry vacuum on small areas, but do not run a household vacuum on wet carpet.
• Run the air conditioning or a dehumidifier, and keep windows closed on humid days.
• Avoid walking on it more than necessary, which pushes water deeper and stretches the carpet.

If more than a small area is wet, emergency water removal gets the water out of the pad, where fans cannot reach.