Wood Floor Cupping

It is not hard to see the effect in wood flooring either. Wood is hygroscopic in nature and thereby tends to absorb moisture from its surroundings causing problems in hardwood floors. Cupping means that the wood that is raised on the edges of each individual floor board.

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The center of the board dips below the edges.

Wood floor cupping.

Moisture from below can. The paper will curl up away from the water. Cupping in hardwood floors is caused by changes in moisture levels whether decreases in the air rh above or increases in moisture from below. Increase the relative humidity in the room with cupped floors to 20 percent to prevent cupping from the air being too dry.

As you can see moisture and wood don t go well together. A cupped floor has a concave shape across the width of the boards. 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. What is cupping and how does it occur.

This makes the wood appear to be in a u shape. Cupping is a result of the changes in moisture in the room. Cupping can also occur in rooms with dry humidity. If you imagine a picture of a child drawing a boat in the water then the water will give you a good idea of what a cupped floor looks like.

Wood floor cupping is a common problem that occurs with both solid and engineered wood floors. It ends up looking a little like an accordion. See the picture at the top of this post for an example of a cupped floor. Cupping is one of the unfortunately common issues that can plague hardwood floors.

When the moisture increases the wood swells and then when it decreases the wood shrinks. Other causes of hardwood floor cupping could include situations such as basement plumbing leaks that allow moisture to migrate up into the subfloor and into the wood flooring or the heat from a wood stove that drys out the air in the environment. It can happen to most types of wood and it s often the first observable sign your floor is being affected by moisture. The simplest way to think of wood floor cupping is to imagine the edges of each plank sticking up higher than the centers.

The general effect is easy to demonstrate by putting a small strip of paper onto a small drop of water. If you think you can escape cupping by installing a bamboo or laminate floor you can t for they can also cup.