The short answer
First Steps After the Burst
Turn off the main water valve and shut off electricity to the affected area if there is any chance of water near outlets or wiring. Remove furniture, rugs, and anything else that can trap moisture against the wall. Open windows and doors to start airflow, but avoid pointing fans directly at wet drywall until you've checked for hidden water.
If the wall is wet but not sagging, you can try drying it in place. Use a moisture meter to see how deep the water has soaked. If the drywall feels soft or crumbles, it will not dry back to a solid state, and you'll need to cut it out and replace it. Keep the area ventilated for several days.
Open the Wall Cavity
Water inside a wall cavity does not dry on its own. It sits against the wood studs and insulation, leading to rot and mold. To dry properly, you need to expose the cavity. Cut a hole near the bottom of the wall, about 12 inches up, and another near the top. This creates a chimney effect where warm air rises and pulls moisture out.
Remove the baseboard and any outlet covers so air can move behind the wall. If the wall has fiberglass insulation, it will hold water like a sponge. Pull it out and discard it, as it rarely dries fully. You can then place a fan at the bottom hole to push dry air in and a fan at the top to pull moist air out.
- Wear gloves and a mask when cutting drywall
- Use a utility knife or drywall saw for clean cuts
- Keep the holes open for at least a week
- Check the wall cavity for mold after drying
- Run a dehumidifier in the room to lower humidity
- Monitor moisture levels with a moisture meter
Use Fans and Dehumidifiers
Fans alone are not enough for a soaked wall. A dehumidifier pulls moisture from the air, which speeds up the drying of the wall and the surrounding wood. Place the dehumidifier in the center of the room and keep the doors closed to create a controlled space. Empty the water reservoir regularly, or connect a hose to a drain.
Aim fans at the open wall cavities, not just the surface. The goal is to move air through the wall, not just across the paint. You can also use a space heater to warm the room, but keep it away from wet materials. Warmer air holds more moisture, so it dries faster. However, do not use high heat on drywall, as it can crack the paper.
When to Cut Out the Drywall
If the drywall is wet for more than a few days, or if it shows any sign of mold, cut it out. Also cut if the wall has been soaked by sewage or floodwater, as those require professional cleaning. Cut a rectangle that extends at least 12 inches beyond the wet area, and remove the insulation behind it. Let the wood studs dry completely before installing new drywall.
When to Call in the Pros
If the wall has been wet for more than 48 hours, or if you see mold growth, you may need professional help. Mold can spread quickly and cause health problems. Local water damage pros have industrial dehumidifiers and moisture meters to dry walls thoroughly. They also know how to check for hidden water behind tile or in the subfloor.
Some water damage is beyond DIY. If the burst pipe was in the ceiling or under a slab, or if the water traveled into multiple rooms, the drying job gets complex. Pros can also help with structural drying, which involves drying the wood frame and the building materials. If you live in Redmond, keep your shutoff valve location written down for future emergencies.
- Mold spots on the wall surface
- Wet drywall that sags or feels spongy
- Water that has soaked into the floor or ceiling
- A musty smell that persists after drying
- Electrical outlets or switches near the wet area
- If you are unsure about the extent of the damage
Talk to someone now
Phones are answered 24/7 for Redmond and nearby communities.
Call Now (425) 407-5186Frequently asked questions
How long does it take for a wall to dry after a pipe burst?
It depends on the amount of water, the wall material, and the airflow. With fans and a dehumidifier, a lightly wet wall may dry in a few days. A heavily soaked wall with insulation can take a week or more. Use a moisture meter to check when the wood is dry.
Can I just paint over a water stain after the wall dries?
No. A water stain means the drywall has been compromised. Even if the surface feels dry, the paper backing may be damaged. Paint will not seal out moisture or mold. Cut out the stained area and replace it with new drywall before repainting.
What if the wall still feels damp after a week of drying?
If the wall remains damp, there may be water trapped inside the cavity or the insulation is still wet. Remove the baseboard and check for moisture. If the wood studs are wet, you may need to cut more holes and continue drying. If you see mold, contact a mold professional.