How to Fix Water Damage on Baseboards

First, you’ll need to remove the damaged baseboard. Use a utility knife to cut through the old caulk between the baseboard and wall. Then, using a putty knife, gently pry the old baseboard away from the wall. Most baseboards are affixed to the wall using finish nails, but some may be glued or adhered, so use caution to avoid damaging the wall.

Next, ensure the wall behind the damaged baseboard is dry and undamaged. If any moisture remains, allow the area to fully dry before moving to the next step. Mold can grow quickly—it only takes one to two days for mold to start to grow, so you want to avoid trapping moisture behind the new baseboard. If the wall behind the baseboard is damaged, repair the water-damaged wall plaster or drywall before installing the new baseboard.

Once you’re sure the wall is fully dry, measure and cut a new length of baseboard. Measure with a measuring tape several times before making your cuts with a backsaw or miter saw. Don’t forget to account for any angles that may be cut into baseboard corners.

Place several small dots of caulk along the back of the baseboard. Drill pilot holes through the baseboard, and then use finish nails and a hammer to attach the baseboard to the wall. Caulk corner seams are where the baseboard meets the wall with paintable caulk, and the caulk is let dry according to the manufacturer’s instructions.

Once the caulk is dry, prime and paint the baseboard to match the existing baseboards. Allow for drying time between coats for the best finish.