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Saving Water-Damaged Wood Flooring

Standing water and hardwood flooring don’t go well together. For anyone who lives in hurricane and flood-prone areas this comes as no surprise because homeowners in these areas have to deal with that all the time. If major amounts of water come into contact with your wood floors, they will never be the same again, but you can save them from total disaster. Your local architectural salvage yard might love to have your pulled-up hardwood flooring, but with our guide, this is not the time to give up on it just yet.

Act Fast

The sooner you can act on your wet floors, the better. Wood’s cellulose fibers rapidly soak up water but release that water more slowly. Therefore, you should start pulling off the water with your shop vacuum as soon as possible. Even if you believe your wood floors are so well-finished that water cannot penetrate to the raw wood, think again. Wood floors have many infiltration points besides the top layer: between seams, through breaks in the coating, under baseboards, through heating registers, and a host of other areas.

The secret to preventing mold and mildew growth is the same as with carpeting: Eliminate the dirt. It’s not just water that causes mold and mildew; it’s the combination of water and dirt, and sometimes that dirt is microscopic.

Tools and Supplies You Will Need

– Shop vacuum
– Squeegee
– Stiff brush
– Mild detergent, disinfectant, or TSP (trisodium phosphate), as needed
– Bucket
– Rubber gloves
– Absorbent cloth


Remove Surface Water

Use a shop vacuum on “wet mode” (no bag) to remove as much water as possible from the surface of the flooring. This is easiest with a wide flooring attachment on the vacuum hose. It also helps to use a squeegee to gather the water as you suck it up.

Scrub the Floor

Mix a mild detergent and a compatible disinfectant (such as Mr. Clean) with clean water in a bucket. Scrub the entire floor and all related woodwork (baseboards, stairs and newel posts, etc.) with a stiff brush, rinsing the brush frequently in the bucket. Do not pour the water onto the floor (there’s no reason to add more water to the problem). Scrub thoroughly to remove all dirt, mud, silt, and organic material, all of which can promote mold growth.

Treat Moldy Areas

Clean areas that show signs of mold with TSP (trisodium phosphate) or TSP substitute mixed with water. Scrub affected areas with the solution until the mold and mold discoloration are gone, then rinse with clear water, and dry the surface with an absorbent cloth.

Dry the Floor

Dry the floor naturally and slowly with fans and plenty of airflow through the space. Open windows and doors (unless the outdoor air is more humid than the indoor air), and run fans to move air through the space. For example, place a box fan in a large window or door opening so the fan blows out, then open windows and/or doors on the opposite side of the space to allow fresh air in. This provides cross-ventilation to move the moisture out.

Please remind that it is important to dry the floor steadily but slowly. Wood flooring dried too quickly can crack. Do not apply heat to the hardwood flooring, as this can result in splitting, cupping, and other problems.

Sand Water-Damaged Wood Flooring

After drying a wood floor, you may have some concave or convex floorboards; this is called “cupping.” Heavy sanding with a drum or orbital sander can actually “take down” some minor high areas. However, heavily cupped wood cannot be sanded down flat. It is inevitable that some floorboards may lift up completely at the ends. In this case, face-nail the floorboards back down.

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