Why Does My Hardwood Floor Buckle in Just One Spot?

Buckling in one spot indicates a concentrated moisture problem, not general humidity. You should first check for leaks from plumbing lines running beneath that area, such as supply lines to a sink or a toilet. A slow leak from a refrigerator ice maker line or a dishwasher can also cause this issue. Also, look for any recent spills or overflows that may have seeped between the boards, as even a small amount of trapped moisture can lead to swelling and buckling over time.

Your first priority is to stop the water. If you can identify the source, shut off the water supply to that fixture or appliance. Move any furniture or rugs away from the area to improve air circulation. Use a dehumidifier and fans in the room to help dry the general area, but this won't fix the buckling. Do not attempt to force the boards back down, as this can cause more damage.

Repair depends on the damage severity and flooring type. For minor buckling on a few boards, the pros may be able to dry the area and re-secure the planks. Often, the affected boards need to be removed and replaced to ensure a flat, stable floor. If the subfloor is damaged, it will also require repair or replacement. The final step is refinishing the area to match your existing floor.

• Drying and re-securing loose boards is sometimes possible.
• Removing and replacing the buckled planks is a common fix.
• Damaged plywood or OSB subfloor must be repaired.
• Mold remediation may be needed if the wood stayed wet.
• The repair area is sanded and refinished to blend in. This process requires careful color matching and finishing techniques to make the repair as seamless as possible with the surrounding floor.
• Costs vary widely based on the square footage and materials.