The short answer
Remove Standing Water First
Before you dry the joists, get rid of any pooled water. Use a wet vacuum or towels to soak up as much as possible. The faster you remove the water, the less it can soak into the wood. Pay attention to low spots and gaps where water tends to collect.
If the water came from a leak, find and stop the source. Turn off the water supply if a pipe burst. Check for continued dripping from above. Stopping the flow is the first step to drying. Once the water stops, you can focus on the joists themselves.
Set Up Airflow and Ventilation
Good airflow is key to drying wet wood. Open windows and doors if the weather allows. Place fans so they blow across the joists, not just at the floor above. Aim for a cross breeze that moves air over the entire length of each joist. This helps moisture evaporate from the surface.
If you have a crawl space, direct air into that area. Use a box fan or a portable fan on a low setting. Keep the fans running for several days. The goal is to keep the wood surface dry so that moisture from the core can move outward. You may need to reposition the fans as you go.
- Open windows and doors to create a cross breeze
- Place fans directly on the wet joists
- Run dehumidifiers to pull moisture from the air
- Use a wet/dry vacuum or a transfer pump if there is standing water in a crawl space
- Keep the area warm, but not hot, to speed evaporation
- Check the joists daily for signs of mold or rot
Use Dehumidifiers for Deep Moisture
Fans alone may not dry the joists all the way through. A dehumidifier pulls moisture from the air, which helps the wood release its trapped water. Place the dehumidifier in the affected area and let it run continuously for several days. Empty the reservoir regularly or use a hose to a drain.
For larger areas, you might need more than one unit. The pros often use industrial dehumidifiers and moisture meters to track progress. They can also set up drying equipment that targets the joist cavities. You can rent a dehumidifier from a local tool rental place if you want to try it yourself.
Monitor Moisture Levels
You can't tell if the joists are dry just by touching the surface. Use a moisture meter to check the wood's internal moisture content. Insert the pins into the joist, not the subfloor. A reading below 15 percent is often considered dry enough for most wood, but the exact number depends on the wood species and local conditions.
Check several spots along each joist, especially near the ends and where the wood meets the foundation. If the moisture stays high after a week of drying, the situation may be worse than it looks. That is when you should call in local water damage pros who have the right tools and experience.
- Use a pin-type moisture meter for accuracy
- Test the joist ends and the middle sections
- Compare readings to the surrounding dry wood
- Recheck every few days as the drying progresses
- Look for dark spots or a musty smell as signs of trouble
When to Call the Pros
If the joists have been wet for more than a week, or if you see mold, rot, or sagging, you need professional help. Wet floor joists can weaken the structure of your home. The pros can use structural drying and dehumidification equipment to dry the wood properly. They can also inspect for hidden damage.
The cost of professional drying depends on the size of the area, how long the joists have been wet, and the amount of water involved. In some cases, you may need to replace sections of the joists if they are too damaged. A professional can tell you whether drying is enough or if replacement is the safer route.
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Call Now (214) 730-5993Frequently asked questions
How long does it take to dry wet floor joists?
Drying time varies with the wood type, how wet it got, and the airflow. With fans and dehumidifiers, you might see progress in a few days, but full drying can take a week or more. Check moisture levels to know when they are dry enough.
Can I dry wet joists without removing the floor?
Sometimes. If you can access the joists from below, you can set up fans and dehumidifiers. If the joists are enclosed, you may need to cut access holes. In severe cases, removing the subfloor might be necessary to dry the joists properly.
What if the joists start to mold?
Mold on wet wood is a serious concern. Stop the drying process and treat the mold with a commercial mold cleaner. Wear protective gear like gloves and a mask. If the mold has spread deep into the wood, you may need to replace the joists. See a doctor if you feel unwell from mold exposure.