How to remove water from under hardwood floors?

Author: Delta Upton  |  Last update: Thursday, May 7, 2026

Even if the surface looks dry, moisture can linger deep within the wood. Place a professional-grade dehumidifier in the center of the room and run it on the highest setting for at least 24 hours. If you don't have one, you can rent one from local home repair stores.

How to get rid of water under a hardwood floor?

Drying water under a wood floor requires proper ventilation and dehumidification. Use fans and dehumidifiers to circulate air and remove moisture from the affected area. Additionally, you may need to lift and aerate the floorboards to facilitate drying thoroughly.

What pulls moisture out of wood floors?

Use a dehumidifier placed at the highest setting possible to dry the floors. Place it in the center of the room and leave it on for at least 24 hours. Next, place fans around the room so the entire surface receives the blowing air. Place the fans at the highest settings possible.

How to get rid of water under the floor?

5 Steps to Get Rid of Water Under Floorboards
  1. Remove coverings and dispose of paper products. If you have rugs or mats covering the wet floor, you should immediately remove them. ...
  2. Begin drying the area. ...
  3. Clean and disinfect. ...
  4. Ventilate the room. ...
  5. Call ServiceMaster of Lake Shore.

How to dry out water under flooring?

Use fans, dehumidifiers, or even a wet-dry vacuum to dry water under laminate flooring and the subfloor. Ensure proper ventilation to accelerate the drying process. You can also use towels to absorb excess moisture.

Water Under Floor Boards

What draws moisture out of wood?

After thoroughly towel drying the floor, add absorbent material like sawdust, baking soda, or kitty litter. Spread a generous amount of the material over the affected area and let it sit overnight. The absorbent material helps to draw out any remaining moisture from the wood and makes it easier to dry.

What happens if water gets under your floor?

Second, if the subfloor, crawl space or basement are excessively wet the moisture will eventually penetrate the bottom of the boards resulting in excessive expansion.. Not only does this harm the aesthetics of your flat floor, but it can also cause structural damage if left unaddressed.

How to fix water under a subfloor?

How to Repair Water Damaged Sub-Floor
  1. Stop the Water.
  2. Expose the Sub-floor and Examine.
  3. Remove Damaged Sub-flooring.
  4. Reinforce Floor Joists and Install New Sub-flooring.

Will water evaporate under floor?

Water and moisture that is trapped under the floor will not evaporate on its own so you'll need to determine if the subfloor is affected and if removal of all or part of the floor is necessary to prevent subfloor damage and any mildewing.

How long does it take for water to damage wood floors?

As time passes, the moisture trapped within the wood creates an ideal environment for mold and mildew growth. Within 24 to 48 hours, mold spores can begin to colonize, posing health risks to residents and further compromising the structural integrity of the flooring.

How to remove moisture from a subfloor?

The first way that you can fix a subfloor moisture problem is by removing the finished floor and exposing the subfloor. Make sure that an HVAC system is installed or use a dehumidifier, and then, let the subfloor dry until the moisture levels have gone down.

Will a dehumidifier remove water from the under floor?

Even though your floor looks dry, chances are moisture is still lurking beneath the surface. Moisture can and will find its way into the cracks and crevices of your hardwood flooring. An easy way to remove moisture from your wood floors is to use a dehumidifier.

How do you tell if there is moisture under hardwood floors?

Wood Flooring Moisture Warning Signs
  1. Warping. Warped or buckled floors can occur when wood starts absorbing moisture. ...
  2. Crowning. When there is more moisture in the center of a piece of wood flooring than the edges, the center can rise, creating a crowned appearance.
  3. Cupping. ...
  4. Persistent Water Condensation. ...
  5. Discoloration.

What happens if you leave water on hardwood floor?

Leaving water standing on hardwood floors for an extended period is never a good idea. Water can penetrate the wood's surface, causing swelling, cupping, or staining. Promptly wipe up any spills or standing water using a dry cloth or mop to prevent damage.

How to detect water leak under wood floor?

Signs of Floor Water Damage
  1. Warping: Moisture absorbed by wood floors can soften them, causing the boards to warp. ...
  2. Staining: Dark spots and discoloration on the wood can also be signs of water damage. ...
  3. Mold: Signs of mold include black, gray, or white dots, as well as a musty odor as a result of mildew.

Will swollen wood go back to normal?

Yes, a swollen door will go back to normal. The swelling is caused by humidity and temperature changes, which cause the wood to expand and contract.

How do you remove water from under flooring?

Use fans: Place fans in the affected area to help circulate air and dry out the flooring. Use a dehumidifier: A dehumidifier can help remove excess moisture from the air and speed up the drying process. Remove baseboards: Removing baseboards can help improve airflow and speed up the drying process.

What to do if there is water leak under the floor?

Stop or Identify the Water Source

This may need to be done professionally, but you can try and locate the water source yourself. Most of the time if you listen closely, you'll hear water running. If you can't find the source, contact a local professional to examine your flooring.

Does wet subfloor need to be replaced?

In most cases, damaged subflooring doesn't need to be replaced. However, in the event of extensive water damage from flooding or extended periods of exposure to moisture, damaged sections may need to be removed to avoid mold and ensure structural integrity.

How do you fix water under hardwood floors?

The Solution:
  1. The quick way: There are many companies that offer dehumidifier services that can dry out your floors very quickly. ...
  2. The slow way: Wood will eventually dry out on its own and become almost completely flat again. ...
  3. The alternative way: Another option is to tear-out the wood that is wet and replace it.

How do you stop water seeping under a slab floor?

To prevent water from coming up through a slab after rain, consider installing proper drainage systems such as a French drain and waterproofing the slab to mitigate water seepage effectively.

How do I stop water coming under my floor?

Whilst waterproof paint is available, cracks in flooring are best addressed with a concrete patching compound. This is one of the best methods of stopping water coming up through the basement floor, especially if the floor sees constant traffic.

Can water come up from the under floor?

In short, yes, water can come up through a basement floor. Even if there are no visible cracks, water can find its way up through a concrete floor. It's not magic — it's science.

How much water will damage hardwood floors?

Did you know that even the smallest amount of water could cause damage to hardwood floors? This includes stains, spillage and swelling from in-between the planks, and even rotting. The tough fact about water damage is that it is not always noticeable right away.

What is under my hardwood floor?

You have the top layer that is your floor covering (Hardwood, Laminate, Vinyl, Carpet, etc.), next you have the underlayment (usually a thin layer of fiber, foam, rubber), below that you have your subfloor (plywood, OSB, concrete), and lastly you have the joists which are the foundation to your floors.

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