How to Repair a Water-Damaged Wall

SOME THINGS YOU CAN'T DO YOURSELF

CALL THE PROS

Water damage in walls isn't always obvious. That is, until it causes bubbling paint, crumbling drywall, or moldy odors you can’t ignore. Whether you’ve experienced a basement flood, leaky roof, or dripping pipes in your home, it’s crucial to repair or replace water-damaged drywall or sheetrock before mold and mildew set in. Here’s how to do a water damage wall repair on your own and when to call a professional.

Common Signs of Water Damage in Walls

If you’re noticing anything on this list, you may have hidden water damage:

Peeling, bubbling, or cracked paint
Warped drywall or soft spots when touched
Musty or moldy smell
Brown or yellow stains
Mold growth on walls or baseboards — be especially wary of black mold
Increased indoor humidity or cold, damp walls

Common Causes of Water Damage in Walls

There are several culprits behind water damage in walls:

Leaking or burst pipes behind drywall
Faulty plumbing connections or joints
Roof or window leaks
Clogged gutters or downspouts redirecting water indoors
Poorly sealed bathtubs or showers
Exterior wall cracks or failed siding

How to Fix Water Damage on a Wall: Step-by-Step

The type of water damage in the wall you’re dealing with may affect the exact steps you take. Even so, here are the basics of how to repair a water-damaged wall.

Step 1: Identify and Stop the Source

To begin addressing a water-damaged wall or ceiling in your home, you must identify the source of the water. Water can travel far from the site of the leak and cause damage elsewhere, in unexpected areas. If you aren’t sure where the leak is, contact a licensed plumber to help you out. Without identifying the source of the water, the problem will resurface again later.

Step 2: Assess the Damage

Depending on the amount of water present and the duration of saturation, you may be able to repair the water damage. Heavily saturated drywall will sag or crumble to the touch and must be totally replaced. If the drywall is still securely fastened to studs and the water-damaged area is small, you may be able to remove a small portion of the wall and patch it.

Step 3: Remove Damaged Drywall

When dealing with wet drywall, remember to wear safety goggles and masks.

If you’re dealing with a basement flood situation, use a laser level or other device to mark 6 inches above the waterline around the room. If you are repairing a small area, mark a square or rectangle around the water-damaged area to cut it out.
Lay down a tarp to catch dust and debris.
Use a sharp utility knife to cut at the line.
Remove baseboard trim and then remove wet drywall.
You may also need to remove wet insulation. If you find that the insulation is wet even above the line you’ve cut, more drywall must be removed.

Step 4: Dry Out the Area

Before replacing drywall, give the area at least 48 hours to dry out fully. Use fans, dehumidifiers, and open windows to remove moisture from the cavity behind the wall. Depending on how damp the space is, drying may take up to 72 hours.

In the meantime, contact a licensed electrician to determine the extent of electrical damage to outlets and switches in the walls and whether they need to be replaced.

Step 5: Check for Mold or Insulation Damage

Inspect the wall cavity and studs for signs of mold or rot. Use a mold treatment or call a professional if the mold is widespread.

Step 6: Repair or Replace Plumbing (If Needed)

If a leaking pipe causes the issue, repair it before closing the wall. This may require professional help if the pipe is hidden deep inside the structure.

Step 7: Replace Drywall and Insulation

After the affected areas are fully dried and vetted by an electrician, you can replace insulation and drywall. If you are not experienced with drywall, you may want to contact a licensed contractor to finish this step for you.

Measure and cut new drywall panels to fit the removed section.
Screw them into the studs.
Apply joint tape and compound
Sand smooth after drying.
Use a mold-resistant primer before repainting the wall to match the surrounding surface.

When to Call a Professional

Just because you know how to fix water damage on a wall doesn’t mean you should always tackle the problem yourself. There are some projects that are just above your pay grade. Call a pro if:

You suspect black mold.
The damage affects multiple rooms or floors.
The source of the leak is hard to locate.
Electrical systems may have been affected.
You want help dealing with insurance or large repairs.

Roto-Rooter offers 24/7 help for plumbing and water damage cleanup that goes beyond DIY territory.

Preventing Future Water Damage

Keep an eye out for the signs of water damage in walls so you can take immediate action when there’s a problem. You can also protect your home with these prevention tips:

Inspect plumbing for leaks regularly
Keep gutters and downspouts clear
Install water leak detectors behind appliances
Seal window and door frames properly
Insulate pipes to prevent freezing
Maintain your sump pump and inspect the basement for moisture
Make sure your homeowners' insurance covers water damage

Who to Call for Water Damage in Your Walls

Wall water damage requires fast action. By knowing what signs to watch for and how to fix water-damaged drywall, you can stop the spread — and the cost. For complex plumbing leaks or serious damage, call the licensed professionals at Roto-Rooter.

We’re here 24/7 to help restore your home safely. Our water leak repair services include slab leak detection, any plumbing leak, pipe leak repair, as well as hidden water and sewer leaks. No matter how big the emergency is, the plumbing professionals at Roto-Rooter are ready and equipped to help.

Frequently Asked Questions About Wall Water Damage

Does drywall always need replacement after water damage?

If drywall is soft, sagging, or moldy, it must be replaced. If it’s only slightly damp and dries quickly, it might be salvageable. A plumber or water damage specialist would know for sure.

Will insurance cover water damage behind walls?

Insurance may cover sudden damage (like a burst pipe) but not long-term leaks or poor maintenance. Always review your policy details or speak with your provider.

How much does it cost to repair a water-damaged wall?

Minor repairs may cost a few hundred dollars. Larger issues involving plumbing, mold remediation, or structural damage can run in the thousands.