The short answer
Remove Standing Water First
Before anything else, get rid of any pooled water on the subfloor. Use a wet/dry vacuum or a submersible pump for deeper water. Mop up the rest with towels, then wring them into a bucket. The faster you remove standing water, the sooner the actual drying can begin.
Once the surface looks dry, it is not truly dry. Subfloor materials, especially plywood or oriented strand board, soak up water like a sponge. Press a paper towel against the surface; if it picks up moisture, keep extracting. In humid spring weather, this step matters even more because the air can slow natural evaporation.
Pull Up Wet Flooring and Baseboards
Carpet, laminate, and hardwood trap moisture against the subfloor. Pull up any wet flooring and set it aside to dry separately, or discard it if it is badly damaged. Remove baseboards and trim too, because water wicks up behind them. This exposes the subfloor so air can reach every wet spot.
- Wear gloves and a mask when handling wet materials.
- Stack wet carpet and padding outside to dry.
- Label any removed pieces so you can reinstall them later.
- Check for staples or nails before pulling up flooring.
- Use a utility knife to cut carpet into manageable strips.
Blow Air Across the Subfloor
Air movement is the key to fast drying. Place several box fans or a high-velocity fan so they blow directly across the wet subfloor. Aim them to create a cross-breeze, with one fan pushing air in and another pulling it out. Open windows and doors if the outdoor humidity is lower than indoor levels.
In humid weather, keep windows closed and rely on fans plus a dehumidifier. A dehumidifier pulls moisture out of the air, which then allows more water to evaporate from the subfloor. Empty the dehumidifier reservoir often, or connect a hose to a drain. Run the fans for at least 24 to 48 hours, checking progress daily.
- Position fans at low angles to sweep the floor surface.
- Use a dehumidifier set to 40 to 50 percent relative humidity.
- Run a fan in an adjacent room to improve overall airflow.
- If you have central air conditioning, turn it on to lower humidity.
- Check under cabinets and in corners where air may not reach.
Use a Dehumidifier and Heat
Heat speeds up evaporation, but too much heat can warp wood. Set your thermostat to a moderate 70 to 75 degrees Fahrenheit. Combine that with a dehumidifier to pull the released moisture out of the air. This combination works faster than fans alone, especially in humid climates.
After the first day, feel the subfloor with your hand. It should feel dry to the touch, but that does not mean it is dry deep down. Use a moisture meter if you have one, or place a plastic sheet over the floor and tape the edges. If moisture beads on the underside of the plastic after a few hours, the subfloor still needs more drying time.
Know When to Call the Pros
If the subfloor remains damp after two to three days of active drying, or if you see mold or a musty smell, it is time to bring in local water damage pros. They have industrial dehumidifiers, moisture meters, and experience with drying subfloors in humid areas. They can also identify hidden moisture in wall cavities or under the house.
In humid climates, spring storms can cause flooding that soaks subfloors deeply. A pro can help assess whether the subfloor can be saved or if sections need replacement. Policies vary, and your insurer decides what is covered. Acting quickly reduces the chance of structural damage and mold growth.
- Call if you see warping, buckling, or soft spots.
- Call if a musty odor develops within 48 hours.
- Call if you cannot get the moisture level below 15 percent.
- Call if the water came from sewage or floodwater, which may be contaminated.
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Call Now (214) 730-5993Frequently asked questions
How long does it take to dry a wet subfloor?
Drying time depends on how much water soaked in, the type of subfloor, and your climate. With fans and a dehumidifier running nonstop, a lightly damp subfloor may dry in two to three days. Heavily saturated subfloors can take a week or more. In humid weather, expect longer drying times.
Can I dry the subfloor without removing the flooring?
No, not effectively. Flooring like carpet or laminate acts as a barrier that traps moisture against the subfloor. You need to pull it up so air can reach the wet surface. Even vinyl or tile can trap moisture underneath, leading to mold and rot. Removing the flooring is the fastest way to dry the subfloor.
What if the subfloor is still wet after a week?
If the subfloor stays wet after a week of active drying, it may be saturated deep into the wood or OSB. At that point, the pros may need to cut out and replace damaged sections. Continuing to dry may not save it. Call local water damage pros to assess the extent and discuss repair options.