The short answer
What Causes the Bounce
When water soaks into plywood or oriented strand board subflooring, the wood fibers swell and then shrink as they dry. This movement loosens the nails or screws that hold the floor to the joists, creating gaps and allowing the floor to move up and down. The longer the moisture sits, the more damage it does.
Check for the Leak Source First
Before you think about repairs, you need to stop the water. Look for common sources like a leaking refrigerator water line, a dripping dishwasher, a toilet wax ring, or a roof leak. If the leak is still active, the floor will keep absorbing moisture and the bounce will get worse.
Turn off the water supply to the appliance or fixture if you can find the shutoff valve. If the leak is from a pipe in a wall or under the house, you may need to cut the water to the whole home. Once the water is off, dry the area with towels, fans, and a dehumidifier. If you live in Layton, keep your shutoff valve location written down for quick access.
Bullets for this section:
Check under sinks, around toilets, and behind refrigerators.
Look for water stains on the ceiling below the floor.
Feel the subfloor for soft spots or dampness.
Use a moisture meter if you have one to find wet areas.
Open windows and run fans to speed drying.
When the Floor Needs Professional Repair
If the bounce is widespread or the subfloor feels soft and crumbly, the damaged sections usually need to be cut out and replaced. The pros can remove the wet flooring, dry the joists, and install new subfloor panels. They may also need to sister the joists if the wood has rotted or cracked.
The repair process often involves pulling up the finished floor, replacing the subfloor, and then reinstalling new flooring on top. If the joists are damaged, the pros may add support beams or new joists alongside the old ones. This work is structural, so it is not a simple DIY fix for most homeowners.
Soft, spongy areas that collapse under pressure.
Visible mold or mildew on the subfloor or joists.
Sagging floors that slope toward the leak.
Creaking sounds that get louder when you walk.
Water stains on the subfloor that are dark or spreading.
How to Dry the Area at Home
You can start drying the area yourself, even if you plan to call the pros later. Remove any wet carpet, padding, or furniture. Use a wet-dry vacuum to pull water out of the floor. Then set up fans to blow across the surface and a dehumidifier to pull moisture from the air.
Open windows if the weather allows, and keep the air moving for several days. Do not cover the wet floor with plastic or rugs, because that traps moisture. If the leak was from a clean water source, the drying process is more straightforward. If the water was contaminated, take extra safety precautions and see a doctor if you feel unwell.
Use fans to circulate air across the floor.
Run a dehumidifier to lower humidity levels.
Remove baseboards to let air reach the subfloor edges.
Drill small holes in the subfloor to help airflow if needed.
Keep the area dry for at least a week before assessing damage.
What the Repair Process Usually Involves
When the pros handle the job, they first stop the leak and extract any standing water. Then they assess the extent of the damage, often using moisture meters to find hidden wet spots. They may remove the finished flooring in sections to expose the subfloor.
After the subfloor is exposed, the pros cut out any damaged panels and replace them with new plywood. If the joists are wet but not rotted, they may dry them out and reinforce them. If the joists are rotted, they can add new joists alongside. The final step is installing new flooring that matches the rest of your home.
The cost of this work depends on the size of the affected area, the type of flooring, and whether joists need repair. A simple subfloor patch might be a few hundred dollars, while a full room replacement can run into the thousands. Your insurance company may cover some of the damage, but policies vary, and your insurer decides what is covered.
Talk to someone now
Call (801) 383-0232 any time, day or night, and describe what happened.
Call Now (801) 383-0232Frequently asked questions
Can I just put a rug over the bouncy spot?
A rug hides the problem but does not fix it. The bounce means the subfloor or joists are damaged. Walking on it can make the damage worse. You need to dry the area and likely replace the damaged wood. Call the pros to inspect the floor.
How long does it take for a floor to dry after a leak?
Drying time depends on how much water soaked in, the type of wood, and airflow. It can take several days to a few weeks. You can speed it up with fans and a dehumidifier. Do not rush repairs while the wood is still wet.
Will the floor go back to normal after drying?
Sometimes, if the damage is minor and the wood did not warp or rot. But often the swelling and shrinkage leave permanent changes. The floor may stay bouncy or feel uneven. Replacing the damaged subfloor is usually the only lasting fix.