Hardwood and Laminate Floor Water Damage: Can It Be Saved?

Solid and engineered hardwood can often be saved after a leak if the water is removed quickly and drying starts before the boards are badly warped. The biggest mistake is sanding a cupped floor before it is fully dry. Laminate is different: its fiberboard core swells and usually can’t be dried back to shape.

What to do first

1. Stop the source of the water.
2. Remove standing water with towels or a wet/dry vacuum. Don’t leave water sitting in the seams between boards.
3. Lift wet rugs and move furniture off the floor.
4. Start drying with dehumidifiers and fans. EPA’s guidance for wet wood is to remove moisture immediately using dehumidifiers, gentle heat and fans, with caution on hardwood floors. Avoid space heaters or high heat aimed at the floor, since NDSU Extension warns sudden drying can crack boards. Don’t use fans if the water may be contaminated.
5. Take photos before anything is removed.

Signs of water damage in hardwood

Cupping

The National Wood Flooring Association describes cupping as raised edges across the width of each board. It happens when the bottom of the board is wetter than the top, and it is the most common result of a leak.

Crowning

The opposite shape, with the center higher than the edges. It often happens when a cupped floor is sanded flat while still wet, then dries and shrinks.

Buckling

Boards that lift off the subfloor. NWFA’s Hardwood Floors magazine says buckled flooring requires replacement where buckling occurred, while some extension guides note buckled boards can be refastened once dry. Either way, a buckled area needs a professional assessment.

Other signs

Dark stains or discoloration, a cloudy or blistering finish, squeaks and loose boards, gaps opening after drying, soft or spongy spots that point to subfloor damage, and a musty odor that suggests mold under the floor.

Can water-damaged hardwood be saved?

Often, when clean water is removed quickly and the boards are only slightly cupped. NWFA guidance describes drying mats or panels connected to vacuum systems that pull water up through and from under the boards while dehumidifiers dry the air.

Mississippi State University Extension cautions that badly warped hardwood usually can’t be repaired, and floors soaked by sewage or floodwater are removed. MSU advises scrubbing salvageable wood with detergent and a disinfectant and replacing badly infected wood.

Mold under wood floors

Water trapped under hardwood and in the subfloor can’t evaporate quickly, which makes it a common place for hidden mold. EPA advises drying water-damaged materials within 24 to 48 hours, and a UC Riverside mold plan calls for drying hardwood floors within 72 hours of the water damage. A musty smell after the surface looks dry is a sign moisture is still underneath.

Don’t sand too soon

NWFA’s guidance is to rely on moisture readings, not appearance, before sanding. A cupped board can read dry at the surface while the wood deeper down is still wet. NWFA recommends comparing readings with unaffected wood in the same house, with a target within about 2 percent of the expected in-use moisture content.

NDSU Extension adds that wood should dry slowly, since sudden drying can crack or split boards, and recommends a moisture meter to confirm the floor is dry before it is refinished or covered.

The subfloor and slab

MSU Extension notes subfloors may need several months to dry without professional equipment. On concrete, NWFA notes that flooring adhesives and sealers slow the drying of a wetted slab, so the slab under glued-down wood needs its own readings before new flooring goes down.

How long hardwood takes to dry

There is no fixed time. Extension services describe drying slightly warped floors as taking weeks or even months without equipment, and GSA guidance gives a similar range. Professional drying shortens that, and the floor is finished only after readings match unaffected wood.

Repair options once the floor is dry

Wait for the floor to settle before deciding. The U.S. General Services Administration’s preservation guidance notes drying can take several weeks or months, and that moisture readings should stay balanced for at least 30 days before cupped boards are repaired. Many slightly cupped floors flatten on their own as they dry.

• Sand and refinish: for boards that are flat and dry but stained or with a damaged finish.
• Replace individual boards: GSA advises replacing only the boards that stay warped after drying, and resanding the floor if cupping remains.
• Replace the floor: for widespread buckling, floors soaked by sewage or floodwater, or a subfloor that has to come out.

Engineered wood can only be refinished if its top wear layer is thick enough. NWFA’s refinishable program sets a minimum of 2.5 mm for factory-finished and 3.2 mm for unfinished engineered flooring. Wet plywood or OSB subfloor that has delaminated, gone soft or grown mold is replaced rather than dried.

Engineered wood and laminate

Engineered hardwood

Engineered boards have cross-layered plies that restrain each other, so they move less across their width than solid wood, but they can swell in thickness and the layers can separate.

Laminate

Laminate has a fiberboard core that swells when it absorbs water, and the swelling generally doesn’t reverse. Manufacturer warranties, even for water-resistant lines, typically exclude standing water, leaks and flooding. Laminate with water underneath usually has to be lifted so the floor beneath can dry.

How to protect wood floors from water

• Keep indoor humidity at 30 to 50 percent year-round, as NWFA recommends.
• Wipe up spills right away and clean with a barely damp mop, not a wet or steam mop.
• Check supply lines on the dishwasher, refrigerator and sinks near wood floors.
• Use mats at sinks and doors, and pads under plants and pet bowls.

Does insurance cover wood floor water damage?

The California Department of Insurance notes homeowners policies do not cover flood damage but do cover other kinds of water damage, and that seepage or long-term leaks and wear and tear are generally excluded. A sudden leak that damages hardwood is usually part of a covered claim. Photos, moisture readings and the cause of the leak are what the adjuster needs.

Wood and laminate floors in Murrieta

Hardwood floor water damage FAQs

Can hardwood floors be repaired after water damage?

Often, if the water was clean, it was removed quickly and the boards are only slightly cupped. Badly warped or contaminated floors are replaced.

Can I use a fan or heater to dry a wet wood floor?

Fans and dehumidifiers help with clean water. EPA allows gentle heat with caution on hardwood, but avoid space heaters and high heat, since sudden drying can crack boards.

How can I tell if water reached the subfloor?

Soft spots, a musty smell, cupping that doesn’t settle and high moisture readings through the floor all point to a wet subfloor.

How long does it take hardwood floors to dry after water damage?

There is no fixed time. Drying can take weeks or months, and GSA guidance calls for readings to stay balanced for about 30 days before repairs.

Can laminate flooring be dried out?

Usually not. Its fiberboard core swells and doesn’t return to shape, so swollen laminate is replaced.

Sources

• National Wood Flooring Association: Problem prevention
• SCAG: City of Murrieta pre-certified housing data
• U.S. GSA: Repairing cupped floorboards