Hardwood Floor Refinishing & Sanding in Lithia Springs, GA
Boards that curl up along their edges or hump in the middle are telling a moisture story. Hardwood floor refinishing in Lithia Springs can bring a misshapen floor back to a flat, smooth surface, but only after the source of the moisture has been dealt with and the wood has had time to settle.
Sanding a floor that is still moving is one of the most common ways a refinish goes wrong, so this page starts with what the shape of the boards means.
Reading the shape of the boards
- Cupping. The edges of each board sit higher than the center. The underside has absorbed more moisture than the top and swelled.
- Crowning. The center is higher than the edges. This often follows a cupped floor that was sanded flat before it dried; as the wood shrank back, the edges dropped.
- Gaps. Narrow spaces between boards that open in dry months and close in humid ones. Some seasonal movement is normal.
- Buckling. Boards lifting off the subfloor entirely, usually after a lot of water. That is a replacement job, not a sanding one.
Finding where the moisture comes from
Typical sources include a damp crawlspace, a slow plumbing leak, a refrigerator or dishwasher line, water working in at an exterior door, or even a pet’s water bowl that keeps spilling in one spot. The pattern of the cupping often points toward the cause: one corner, a strip along a wall or the whole room.
A leak or drainage problem needs to be corrected by the right trade before floor work is scheduled. Refinishing treats the surface, so if the moisture continues, the boards will keep moving after the new finish goes on.
Letting the floor settle before sanding
Once the source is fixed, cupped boards often flatten partly on their own as they dry. How long that takes depends on how wet the floor got and how the house is heated and cooled. A moisture meter, not the calendar, decides: readings on the affected boards are compared with readings from a dry part of the house, and sanding waits until they are close and stable.
Wear depth, board damage and remaining wood
Water often leaves more than a shape change. Boards with black stains, splits or soft spots are marked for replacement, and the existing finish may have clouded or peeled where water sat on it. Leveling a cupped floor also removes more wood along the board edges than a normal refinish, so the remaining thickness above the tongue is measured before a full sanding is promised.
If a section is too far gone, our hardwood floor installation in Lithia Springs page explains how damaged areas are replaced and tied into the existing floor.
Sanding a floor that is not perfectly flat
Leveling passes are often run at a slight angle to the grain to knock down high edges, followed by passes with the grain through finer grits to remove the cross-scratches. The edger and hand scraper then work along the walls, around vents and at doorways, where boards near an exterior door may have taken the most water.
Color and sheen choices affect how forgiving the finished floor is. A matte or satin sheen and a mid-tone stain hide slight remaining unevenness, while gloss and very dark colors make every ripple visible when light comes across the floor at a low angle.
Dust control and the order of work
The house is protected with plastic at doorways, covered registers and the heating and cooling switched off during sanding. The work then moves from board replacement to leveling passes, finer grits, edging and scraping, a thorough vacuum, stain if chosen and finish coats with light abrasion between them. Cure time follows the finish manufacturer’s instructions before furniture and rugs return.
Douglas County permits and the estimate
Lithia Springs is in Douglas County. If repairing the cause turns into structural work on joists or subflooring, or into plumbing or electrical changes, Douglas County Development Services, Building Permits and Inspections can tell you whether a permit is needed.
The written estimate for a moisture-damaged floor should note the readings taken and that sanding waits for the wood to stabilize. It should list board replacement or an allowance, leveling and sanding, color and finish with sheen and coat count, thresholds, dust protection and cleanup, along with how additional damage found later is priced and approved.
Frequently asked questions about cupped and crowned floors
What causes hardwood boards to cup in a home?
Cupping happens when the underside of the boards takes on more moisture than the top. Common causes include a humid crawlspace, a slow plumbing leak, a wet subfloor, or water working in near an exterior door or appliance. The bottom of each board swells and its edges rise. Correcting the moisture source comes first, because sanding only treats the surface.
How do you know when a cupped Lithia Springs floor is dry enough to sand?
With a moisture meter. Readings are taken on the floor and, where possible, the subfloor, then compared with readings from an unaffected part of the house. When the numbers are close and stay steady over repeat checks, the wood has settled. Sanding while boards are still drying is a frequent reason a floor later crowns.
Can a crowned floor be fixed by sanding it again?
Sometimes. If the boards have stabilized and enough wood remains above the tongue, sanding can flatten the humps. The catch is that crowned floors have often been sanded once already, leaving less material at the board edges. Thickness is checked first, and badly crowned or thin boards may need replacing instead of another heavy sanding.
Describe what your floor is doing
Call 404-409-4448 and tell us how the boards have changed, where it started and whether a leak has already been repaired. We can check the floor in person and give you a written estimate once it is ready for sanding.