How do you fix a swollen wood floor?

Author: Prof. Thelma Hane  |  Last update: Thursday, November 20, 2025

To correct swelling in wood caused by water, begin by drying the wood thoroughly. Use fans, heat, or a dehumidifier to reduce the moisture content. Once dry, sand the swollen area to flatten it. If the swelling persists, you may need to apply a wood conditioner or sealant to prevent further moisture absorption.

Will a swollen wood floor go back to normal?

While swollen wooden flooring can often be restored, addressing the root cause of moisture is crucial to prevent recurrence. If the swelling persists after trying these methods, consulting with a flooring specialist may be necessary.

How to flatten a swollen wood floor?

Here are the steps you can follow to fix a water-damaged, swollen wood floor:
  1. Step 1: Identify the source of water. ...
  2. Step 2: Remove standing water. ...
  3. Step 3: Dry the area and Assess. ...
  4. Step 4: Sand the swollen areas. ...
  5. Step 5: Apply wood conditioner. ...
  6. Step 6: Apply wood glue or epoxy. ...
  7. Step 7: Sand and refinish.

Can swollen wood be fixed?

Minor water damage on wood tables can be reversed fairly easily. You can remove stains and light surface damage with a sandblock, then repaint and re-varnish the wood surface. For swollen and rotten wood, you can cut away the damaged parts and use a wood filler as long as the affected area isn't too much.

Will a swollen wood floor shrink?

Provide plenty of air circulation in that area for the next several weeks. Maybe a blower or fan. The swelled wood will gradually shrink again.

How To Repair A Hardwood Floor

How do you fix a hardwood floor that is bulging?

How to Repair Buckled Hardwood Floor
  1. Step One: Disassemble the Buckled Floorboards. ...
  2. Step Two: Clean the Subfloor and Back of the Floorboard. ...
  3. Step Three: Apply Professional Wood Floor Adhesive. ...
  4. Step Four: Replace and Apply Pressure. ...
  5. Step Five: Allow for Drying Time. ...
  6. Step Six: Recheck Humidity Levels.

Is swelling of wood reversible?

Swelling increases until the fiber saturation point has been reached. Water added beyond this point remains as free water in the lumen and does not cause further swelling. This process is reversible and accounts for the dimensional changes that occur when wood comes into contact with moisture (Stamm 1964).

Does wood swelling go away?

In a humid environment, using a dehumidifier can help pull moisture out of the wood, reducing swelling more effectively.

How do you fix water damaged wood without replacing it?

To treat water-damaged wood, first ensure the wood is thoroughly dried using fans or a dehumidifier. Sand away any raised fibers or stains caused by the water, then apply a wood stain or sealant to protect the wood from future moisture. In some cases, you may need to replace severely damaged sections.

What does it mean when wood swells up?

Shrinking and swelling occur as the wood changes moisture content in response to daily as well as seasonal changes in the relative humidity of the atmosphere, i.e., when the air is humid, wood adsorbs moisture and swells; when the air is dry, wood loses moisture and shrinks.

Can you fix swollen flooring?

Start by drying out the affected area using fans or dehumidifiers. If the swelling is minor, you may be able to fix it by gently tapping the swollen boards back into place using a rubber mallet. However, if the swelling is severe, you may need to replace the damaged boards altogether.

Will warped wood floor go back to normal?

Will Warped Wood Floor Go Back to Normal? In some cases, warped wood floors can return to their original state once the underlying moisture issue is resolved. Drying out the area is crucial.

Can hardwood floors swell?

High Humidity: A high-humidity environment can cause the wood floor to absorb moisture from the air, leading to changes in size and swelling. This often occurs in the summer or in rainy climates.

How to fix a swollen wooden floor?

To correct swelling in wood caused by water, begin by drying the wood thoroughly. Use fans, heat, or a dehumidifier to reduce the moisture content. Once dry, sand the swollen area to flatten it. If the swelling persists, you may need to apply a wood conditioner or sealant to prevent further moisture absorption.

Will water under floorboards dry out?

Most wood floors flooded with water will take weeks or more to fully dry out. In some circumstances, especially with a wooden subfloor, removing the wood flooring is necessary to fully dry out the subfloor. Total replacement of all the flooring is necessary in these cases.

Will cupped hardwood floors flatten out?

In many cases, floors with minor cupping will flatten out once the underlying moisture issues have been addressed.

How to flatten swollen wood?

Olive Oil and Vinegar: Using equal parts olive oil and vinegar, wipe the mixture in the same direction as the wood grain using a soft cloth until the ring is gone. Irons: If the water damage is still damp, lay a cloth on top and put the iron on a very low setting with no steam.

What is the best product to repair rotted wood?

If you catch rotted wood in time, you can successfully repair it with epoxy resin. Repairing rotted wood means you'll be able to stain or paint it again to blend in with the surrounding wood.

Can water damage in wood be reversed?

Complete reversal of water damage in wood is challenging. Quick action and proper restoration techniques can mitigate harm, but certain effects like warping or irreversible decay may remain.

Will swollen wood floor shrink?

So if the air is humid, the wood will absorb more moisture from the air, and it will swell. If the air is dry, wood fibers will release some of its moisture back into the air and it can shrink back down.

Is wood swelling reversible?

During the manufacturing process, the wood cell is macerated, but the fibrous cellulose structure remains hygroscopic, or water absorbent. Moisture absorption by composites results in near irreversible swelling.

Why is my floor bulging upwards?

Have you noticed your floor bulging upwards? This common issue can be caused by factors like moisture damage, poor structural support, foundation issues, or improper installation.

Will swollen wood go down?

The swelling is caused by humidity and temperature changes, which cause the wood to expand and contract. Over time, the door will adjust to the new conditions and return to its original shape.

Will water swollen wood shrink?

Water often swells wood. If you dry it out too quickly, it will shrink, crack, and warp.

What causes wood to swell?

When humidity is high, wood absorbs moisture and swells. When humidity drops, wood shrinks. This “movement” is gradual, so you probably won't notice weekly changes. But seasonal changes cause problems you can't miss, like sticking doors, ugly gaps in woodwork or a crack in a tabletop.

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