wood floor cupping after refinishing
Wet lumber improper air or kiln drying can result in cupping. This is especially common with new construction if the floor is installed before any type of HVAC is running within your home.
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Most of the time the flooring cups gradually over time to a particular degree of cup and doesnt get any worse Photo 4.
. Marks Scratches. A cupped wood floor occurs when flooring absorbs excessive moisture on the underside of the flooring planks causing expansion and cupping with the edges of the planks raised. The the only recourse then is to remove and replace.
This makes curve to a bow crook cup or twist. If you still see cupping along the edges of some boards after the floors have been thoroughly dried you will likely need to sand and refinish the area. The reason I was called to look at the floor was because despite this being a vintage 50-year-old wood floor during the resand process the floor started gapping and slightly cupping after all of the old finish had been sanded off.
In this way will cupped hardwood floors flatten out over time. As weve learned wood floor cupping is caused by the expansion of the floor planks due to moisture. The floor previously had no issues with cupping but after sanding and coating it the floor cupped.
Lighter. Wood Floor Sanding Refinishing. Cupping that happens after refinishing could be merely a coincidence or it could be the result of an impermeable finish trapping moisture.
Wood Floor Moldy Odor and Cupping. PRO BeverlyFLADeziner 8 years ago I agree with GreenDesigns. Look to the crawl space for the problem.
This can be an acclimation issue or if flooring was overly dry at delivery. Cupping occurs when the edges of the board are higher than the center of the. When water seeps into a plank of wood flooring the side of the board closest to the moisture will expand.
Moisture can also cause wood flooring to exhibit a condition called crowning in which the outer edges of the wood planks shrink and become lower than the middle of each plank. The 2 reason for cupping is. Cupping is when the edges of a board are higher than its center due to moisture which causes the wood to expand.
The center of the board dips below the edges. Cupping occurs in solid wood flooring as a result of an elevated MC in the bottom of the flooring compared with the MC of the face. Cupping that needs to be sanded flat Hardwood Refinishing Warping of the wet floor boards.
Wood flooring cupped at the time received should be returned not installed. However usually high RH is the culprit. This machine will slowly move over the hardwood bringing it back to normal.
The general effect is easy to demonstrate by putting a small strip of paper onto a small drop of water. The longer the floor stays damp the less likely cupping can be removed and warping and mold damage can ruin the floor. After all both engineered and solid hardwood consist of real wood which warps when it absorbs water.
Cupping is a wood floors natural reaction to moisture. Wet hardwood floors that have been wet for more than 3 days are tougher to dry out and have less of a success ratio. It may take an entire heating season for the wood to relax so most of the cupping disappears.
It may be considered to be the opposite of crowning where the center of a plank rises higher than the edges. Loose or Creaking Boards. In both cases your floor will lose its even smoothness resulting in its surface becoming irregular.
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. Installation Causes of Wood Floor Cupping. This should be seen at the time the flooring is received prior to installation.
We smelled some mildew in the first floor of the house after a good rain and quickly realized after bringing in contractors that we need to encapsulate and remediate the mold that was present throughout the space on floor. Termite Damage. Cupping that occurs after the flooring manufactured.
Flooring that gains moisture dictated by a more humid environment after installation. If your hardwood floors have a wavy appearance they are likely cupping due to we. After the floor has been wet for more than 15 days the floor has a 90 chance at flattening out the cupping but a 10 chance there will still be some cupped boards.
This can occur after water spills onto the floor and is absorbed by the wood. What happens when that moisture releases from the floor and it returns to its original state. Gaps Splitting.
If there is excess moisture in the concrete slab crawl space or basement below your wood floor this can cause cupping. Check the moisture level of the wood before you begin the project using a moisture meter. Delayed wet floor drying Damage.
It can also happen later if your basement or crawl space harbors more humidity in general. Moisture Damage Spills. Warping happens when wood dries unevenly in the process of losing moisture.
See the picture at the top of this post for an example of a cupped floor Typically cupping is a problem that stems from excessive moisture. It is not hard to see the effect in wood flooring either. I know it had to have happened after they did the finish because 1 it looked fine before they came 2 the floor is more than acclimatized to the area it has been in the house well over 5 decades 3 no professional would have sanded a floor that was cupped 4 the floor is cupped and not crowned meaning even if they had sanded a cupped floor when it when back.
This makes the wood appear to be in a U shape. Refinishing and or removal become more probable the longer drying the wet floor is delayed. Recently there was a question on a Facebook group from a contractor who had refinished a floor.
Too much existing moisture is causing the floor to cup. 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. The edges of a board becomes higher than its center.
Hi - I recently purchased a home that sits on a 2100 crawl space. Keep in mind this floor was being resanded during the summer months when there was no air conditioning and. Cupping in hardwood floors refers to a condition that causes individual planks to rise at the sides.
Wood floor cupping can be avoided or fixed by following a few simple steps. As the wood expands compression can result as the boards are crushed together deforming the boards at the edges. If the boards cup too much you wont be able to sand them down.
Too much existing moisture is causing the floor to cup. The paper will curl up away from the water. Sanding should be done by a professional or with an industrial floor sander.
Jan 19 2021. Cupping means that the wood that is raised on the edges of each individual floor board.
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