The short answer
Start with Safety
Before you touch anything, turn off power to the room if water reached any outlets or appliances. Water and electricity do not mix. Wear rubber boots and gloves, and open windows for fresh air. If you feel unwell from mold or dampness, see a doctor.
Check the source of the water first. If it came from a pipe or appliance, shut off the water supply to stop more damage. If the water came from outside, make sure the leak is fixed before you dry the subfloor. You may need a plumber or roofer for that part.
Remove Wet Flooring
Pull up carpet, laminate, or vinyl that is soaked. These materials hold water against the subfloor and slow drying. You can often save them if they dry quickly, but most porous flooring does not survive. Take out baseboards and trim, too, so air can reach the edges of the subfloor.
If the subfloor is plywood or oriented strand board, it may swell or buckle when wet. You can dry it in place if the damage is not too severe. For wood plank subfloors, the process is similar. Check for soft spots after drying; if the wood feels spongy, you may need to replace sections.
- Use a wet/dry vacuum to pull standing water off the surface
- Lift any loose boards or panels to expose the subfloor
- Move furniture and appliances out of the room
- Take up area rugs and padding right away
- Check the subfloor for visible cracks or gaps
Set Up Airflow
Air movement is the most important part of drying. Place box fans or pedestal fans in the room, pointed at the wet subfloor. Open doors and windows to create cross-ventilation. If the weather is humid, you may need to run a dehumidifier to pull moisture from the air.
For subfloors with a crawl space underneath, you can also dry from below. Open crawl space vents and place a fan there to push air under the house. This helps dry the bottom side of the subfloor, which you can't see. If the crawl space is damp, a dehumidifier there can speed things up.
Drill Weep Holes
If the subfloor is plywood and water got trapped between layers, drill small holes in the top surface. Space them about a foot apart in the wet area. These weep holes let air reach the inner layers and help the wood dry faster. Use a drill bit that is slightly smaller than the holes you would use for screws.
After the subfloor is dry, you can fill the holes with wood filler or leave them if you plan to install new flooring. The holes are small and usually do not weaken the structure. This trick works well when the subfloor is not too badly swollen. For severe damage, you may need to cut out and replace sections.
- Drill holes only in plywood subfloors, not in solid wood planks
- Make holes at the lowest points where water pools
- Blow air across the holes with a fan to increase airflow
- Check the subfloor daily for signs of mold or mildew
- Use a moisture meter to track drying progress if you have one
Know When to Call Pros
Drying a subfloor can take several days to a few weeks, depending on how wet it is and the air conditions. If the subfloor is still damp after a week, or if you see mold growing, it is time to get help. Local water damage pros have industrial fans and dehumidifiers that dry faster than household equipment.
They also know how to check for hidden moisture in walls and under floors. For a thorough job, ask about moisture mapping and structural drying. If the subfloor is badly warped or rotted, you may need subfloor repair. Policies vary, and your insurer decides what is covered.
If you live in Rowlett, keep your shutoff valve location written down. That way you can stop a leak quickly before it soaks the subfloor again. Acting fast after any water event gives you the right chance of saving the wood.
Water damage does not wait
Every hour counts once water gets into floors and walls. One call starts the response.
Call Now (214) 730-5993Frequently asked questions
How long does it take for a subfloor to dry?
Drying usually takes several days to a couple of weeks. The time depends on how much water soaked in, the type of wood, and the humidity. Using fans and a dehumidifier speeds it up. Check the subfloor daily for dampness or mold.
Can I dry a subfloor without removing the flooring?
You can try, but it is much slower and less effective. Carpet and vinyl trap moisture against the wood. Removing the flooring lets air reach the subfloor directly. If you leave it in place, you risk mold and rot underneath.
What if the subfloor is still wet after drying?
If the subfloor stays wet after a week of good airflow, you may have a deeper problem, like a leak still active or water trapped under the house. Call local water damage pros for an inspection. They can find hidden moisture and suggest the next steps.