wood floor cupping after refinishing
Cupping happens when wood absorbs excess moisture causing it to swell and crush the boards together as they deform at the edges and forms a cup- like shape. Black spots appearing after refinishing.
Hayden Flooring Floorcraft Wood Floors
If your floors are finished with oil polyurethane there is no traffic AT ALL for a minimum of 24 hours after the job is finished.
. Cupping that happens after refinishing could be merely a coincidence or it could be the result of an impermeable finish trapping moisture. We havent used oil poly in a long time. Anything from pipe leaks to a still-wet concrete slab to improper HVAC usage can cause cupping.
What Is Cupping in Hardwood Floors. After all both engineered and solid hardwood consist of real wood which warps when it absorbs water. Unlike solid hardwood floors engineered wood floors cup when moisture levels are reduced.
Cupping in hardwood floors is usually caused by changes in moisture levels whether decreases in the air RH above or increases in moisture from below. After cutting a 3 x 5 area of flooring and opening they Categories Loose or Creaking Boards Tight or Popping Boards Post navigation Even out subfloor for floating floor. Cupping in hardwood floors refers to a condition that causes individual planks to rise at the sides.
First some of the oak strips are cupping. Wood is hygroscopic meaning that it absorbs and releases moisture. 48 hours after the job is completed socks-only traffic on the floor.
The failure to properly acclimate a wood floor. Jan 19 2021. The floor previously had no issues with cupping but after sanding and coating it the floor cupped.
What happens when that moisture releases from the floor and it returns to its original state. For most solid wood floor species noticeable cupping can be visible after just a few days. If the hardwood cupping youve noticed is only in certain areas such as near sinks it may have been caused by spills or leaks.
Cupping occurs when the edges of the board are higher than the center of the. Since engineered wood flooring is created using two layers of wood the face of the boards will begin to cup faster roughly 10 times faster than its backer layer. Solid hardwood flooring offers the broadest range of options as you can sand and scrape away up to 14 of an inch of the wood to remove cupping or surface mold and staining once the planks are dry.
Always clean up any water spills immediately and if there is a water leak somewhere get it repaired before the cupping damage is out of control. In both cases your floor will lose its even smoothness resulting in its surface becoming irregular. When water seeps into a plank of wood flooring the side of the board closest to the moisture will expand.
The floors and house date from the 1930s. We have a problem and hope someone can guide us to resolve it. Days after black spots started appearing in one room.
Once the area has begun to dry bring in a dehumidifier to remove any excess moisture stuck in the woods pores. The suggested moisture range of most Hardwood floors is 6-9. Finally use a moisture meter to check the area is completely dry.
This video is about Cupping. Minor cupping is a natural reaction to moisture and shouldnt be a concern. This pass with the sandpaper should.
The house is pier and beam construction with a crawl space under the house. Solid flooring can also be replaced and new planks more easily retrofitted into the existing flooring. Dry air will pull moisture out of a hardwood floor causing cupping.
We recommend a minimum of 2 days of socks-only traffic for floors finished with oil polyurethane. As weve learned wood floor cupping is caused by the expansion of the floor planks due to moisture. Hardwood floor cupping is usually caused by the top of the floor drying out.
This makes curve to a bow crook cup. In this article we will discuss what cupping is and. The edges of a board becomes higher than its center.
Attach 50-grit sandpaper to the floor sander and to the orbital sander. Thanks for your comments. It may be considered to be the opposite of crowning where the center of a plank rises higher than the edges.
The spots are getting bigger and more are appearing each day. Cupping is a wood floors natural reaction to moisture. What we know is that the cupping was caused by a moisture imbalance through the thickness of the wood that had previously been protected by a nearly impermeable membrane of finish.
This room is on a second floor so no water problem. My daughter and my husband refinished her hardwood floors with Minwax products and finished the job about December of 2012. The dry winter with the heat on will reduce the humidity level more.
When one side of the floor is exposed to excessive moisture that side will expand causing the. A wood floor that is placed in a house for acclimation during the time wet work such as painting and plastering is being performed may pick up moisture resulting in wood floor cupping following installation. Recently there was a question on a Facebook group from a contractor who had refinished a floor.
Warping happens when wood dries unevenly in the process of losing moisture. Cupping Cupping can occur even with a perfectly-installed wood flooring depending on the environmental conditions and the building. Proper cleaning techniques will go a long way to preventing hardwood cupping.
A wood moisture meter is an accurate tool to detect moisture problems in hardwood flooring and prevent cupping. Sanding a cupped floor flat before it is brought to a normal moisture content can eventually result in a crowned floor convex surface once the drying process is complete. Cupping can be prevented by addressing several common issues.
A crucial factor is the relationship between air humidity and wood moisture. I can only make. I just had my oak engineered floors refinished by professionals.
To dry out cupped hardwood floors start by vacuuming up visible water and running industrial fans in the room. Never use an overly. Go over the entire surface of the floor again.
Understanding Cupping Warping and Buckling. Buy an Orion Meter.
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