The short answer
Remove Wet Flooring First
Water trapped under finished flooring keeps the subfloor wet. Pull up carpet, vinyl, or laminate planks carefully. If the flooring is glued down, you may need to cut it out. Set the pieces aside if they can be reused, but know that many types swell and won't fit back.
- Work in sections so you can manage the mess
- Label each piece if you plan to reuse it
- Wear gloves and a dust mask
- Set up a trash pile away from the house
- Photograph the damage before you remove much
- Keep kids and pets out of the work area
Start Drying with Air Movement
Air movement is the fastest way to pull moisture out of wood. Place box fans or a high-velocity fan so they blow across the exposed subfloor. Angle them toward open doors or windows to push humid air outside. If you have a crawl space, run a fan down there too.
Keep the fans running for several days. Wood dries slowly from the inside out. You'll see the surface feel dry before the core is ready. Check the subfloor with a moisture meter if you have one. The pros use one to know when the wood is safe to rebuild on.
- Point fans at the wettest areas first
- Run a dehumidifier on the lowest humidity setting
- Open windows when outdoor humidity is below 50 percent
- Close windows and run AC if the air outside is muggy
- Check the subfloor daily for soft spots
- Use a moisture meter if available
Use Heat Carefully
Warm air holds more moisture, so gentle heat can speed drying. Use a space heater or turn up your HVAC. But avoid high heat, which can warp the wood or cause cracking. Keep the temperature between 70 and 80 degrees Fahrenheit if possible.
Do not use a heat gun or blow dryer on the subfloor. That can dry the surface too fast and trap moisture inside. The goal is steady, even drying. Let the wood lose moisture gradually to keep it from splitting.
If you have radiant floor heating, you can turn it on low. That warms the subfloor from below, which helps the joists dry. Check the temperature with your hand to make sure it's not hot to the touch.
- Set a timer so heat doesn't run unchecked
- Keep heat sources away from flammable materials
- Monitor humidity with a hygrometer
- Stop heat if you smell burning wood
- Let the room cool before you go to sleep
Watch for Mold and Rot
Mold can start growing on wet subfloor within a day or two. Look for dark spots, a musty smell, or a slimy feel. If you see mold, don't scrub it with bleach. That just spreads spores. Instead, clean with a mild detergent and water, then dry the area fully.
Rot is more serious. Press on the subfloor with a screwdriver. If it sinks in easily, the wood is soft and needs to be replaced. You can also probe along the edges of the floor. If you find rot, you'll need to cut out the damaged section and sister in new wood.
- Check every day for the first week
- Smell for musty odors
- Look at the underside if you have a crawl space
- Use a flashlight to see into corners
- Don't cover the subfloor until it's fully dry
Know When to Call the Pros
Some subfloor drying is too big for a weekend project. If the water came from sewage, flooding, or sat for more than two days, call local water damage pros. They have industrial dehumidifiers and moisture meters that can dry wood faster and more evenly.
The pros also know how to handle hidden moisture in joists and insulation. They can set up drying equipment that runs for days. They might also recommend replacing subfloor panels if the wood is too damaged. Their work usually includes a plan to prevent future issues.
If you live in Rowlett, keep the phone number of a trusted water damage pro handy. Spring storms and hail can cause leaks that soak subfloors quickly. Acting fast can save the wood and avoid a bigger repair.
- Call if the subfloor feels spongy
- Call if you see standing water under the house
- Call if mold covers more than a small patch
- Call if you can't get the moisture level below 15 percent
- Call if the leak came from a sewer line
Talk to someone now
Phones are answered 24/7 for Rowlett and nearby communities.
Call Now (214) 730-5993Frequently asked questions
How long does it take for a subfloor to dry?
It depends on the wood type, how wet it got, and the air conditions. With fans and a dehumidifier, a light leak might dry in three to five days. A severe flood can take weeks. Check with a moisture meter to know when it's ready.
Can I put new flooring over a damp subfloor?
No. Installing new flooring on damp wood traps moisture and leads to mold and warping. Wait until the subfloor reads below 12 percent moisture content. If you're unsure, have a pro test it with a moisture meter before you lay anything down.
What should I do if the subfloor is ruined?
Cut out the damaged sections and replace them with new plywood or OSB. Match the thickness of the old subfloor. Screw the new panels to the joists. If the damage is extensive, the pros can handle the replacement and make sure the floor is level.