Hardwood Floor Buckling: Causes, Repairs and When to Call an Inspector

Oct 13

3 min read

Updated: 3 days ago

Hardwood floor buckling is when the flooring lifts away from the subfloor, sometimes by an inch or more. It is the most severe reaction a wood floor can have to moisture. Boards absorb so much water that they expand beyond the space available, and with nowhere else to go, they push upward and pull their fasteners or adhesive loose.

What causes buckling?

Flooding, a burst pipe, a dishwasher or refrigerator line leak, or long-standing water.
A wet concrete slab or crawlspace feeding moisture into the floor over time.
Missing or inadequate expansion space at walls, thresholds and fixed objects.
Too few fasteners, or adhesive that was not suited to the subfloor or was not properly spread.

Can a buckled floor be saved?

Sometimes. If the water source is stopped quickly and the flooring is dried properly, boards that lifted only slightly can occasionally be refastened. Severe buckling, where boards have pulled up their nails or broken their adhesive bond, usually means the affected area has to be replaced. The subfloor must be dried and tested before any new flooring goes down, or the problem returns.

What to do right away

Stop the water source and remove standing water.
Take photos and video of the damage, including close-ups and wide shots.
Start drying with dehumidifiers and air movement, ideally under professional guidance.
Do not tear out or replace flooring before your insurer or the manufacturer has had a chance to inspect, unless it is a safety issue.
Keep receipts and records of moisture readings during drying.

Why an independent inspection matters for claims

Insurers, manufacturers and contractors often disagree about whether buckling came from a sudden water event, a long-term moisture condition, or an installation defect, and the answer decides who pays. An independent NWFA certified inspector documents moisture readings, subfloor conditions, expansion space and fastening, and writes a report explaining the cause.

Quick answers about buckled hardwood floors

Why do wood floors buckle?

Because the boards took on so much moisture that they expanded past the room left for them. Water from a leak or flood, a wet slab or crawlspace, too little expansion space at the walls, or weak fastening are the usual causes.

Is a bulging hardwood floor the same as buckling?

Usually it is an early or localized form of it. A floor that rises in a hump or bulge is expanding against something it cannot push past, such as a wall, cabinet or threshold. Find the moisture source and check the expansion space before it lifts further.

Can a buckled hardwood floor go back down?

Slight buckling sometimes settles once the floor dries and the boards are refastened. Boards that pulled their nails or broke their adhesive bond rarely go back down on their own and usually need to be replaced.

Does insurance cover a buckled hardwood floor?

It depends on the cause and your policy. Sudden water events such as a burst pipe are often covered, while long-term moisture or installation problems usually are not. An inspection report that documents the cause is what the claim decision rests on. Here is how to find and verify a certified hardwood floor inspector.

National Wood Floor Consultants provides inspections and expert witness services for buckled and water-damaged floors in New Jersey, New York, Pennsylvania and major U.S. cities including Miami, Los Angeles and San Francisco. Call Joe Avila at (908) 232-6600.

About The Author

Joe Avila is the founder and lead consultant of National Wood Floor Consultants, with 26 years in wood flooring. He is an NWFA Certified Wood Flooring Inspector, installer and sander, and teaches accredited AIA, ASID and IDCEC continuing education for architects and designers. His project experience includes Montclair University, One Wall Street, institutional and landmark buildings, and luxury residences and penthouses, and he pioneered subfloor sound-attenuation systems for New York City apartments. Read Joe's full profile.