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Outdoor Bamboo Decking Cupping

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Exposed to moisture for an extended period of time, bamboo flooring products can absorb moisture and weaken. Because bamboo is grass, the grain runs the length of the board. Inferior or inappropriate bamboo selection, the use of bamboo that is either harvested too young or not properly dried can be prone to changes in temperature and humidity. This can lead to cupping, warping and swelling of the material.


1. Uneven distribution of floor moisture content

2. The floor is slotted on one side and not slotted on the other. The two sides of the floor are not the same as the air contact area, and the degree of water absorption is different, resulting in different moisture content on both sides of the floor.

In the case of high air humidity, there is less water in the air without the slotting side, and the side of the back slot absorbs more water in the air, expanding the face surface of the back slot, but the surface of the plane does not expand, so the floor will bend like that of the plane.

In the case of air drying, on the contrary, the board will bend like a slotted side.

warp flooringwarp board


1. In production:

When health balance, drying should not be too fast, drying kiln to keep the temperature uniform;

Try to make sure that both sides of the floor have the same texture

2. How to avoid before installation

Proper expansion joints reserved for paving

3. After installation

Because the weather humidity changes with the season, you can see if the floor will recover in a few months. If it is still tile, you can only replace the floor

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Our inspector arrived at the factory and started regular project testing. 1. Material Use of recycled material can result in excessive swelling, delamination and warping, our inspector will observe the flooring material color, smell etc. to judge whether factory using virgin/ recycle material. 2. Appearance and Size, Number - Defects, fissures, wrinkles, holes, Offset printing, delamination, peeling, Gloss unevenness, Press mark, Spots, bubbles, scratches, discoloration etc. - Length, Width, Thickness - Patent sticker - Order number and Loading Number After check over, all items looks good. Then factory without any test equipment because it's new. 3. Physical and Chemical Performance Requirements The SPC flooring process machines are automatic, which greatly improve the production efficiency, but the stability of the control of the floor is difficult to increase, so we will do the spc testing as follow: 1. Dimensional changes after heating( 6hrs at 80℃) 2. Curl after 6hrs at 80℃ 3. Fitting degree (film paper and SPC core) 4. Density test 5. Tensile strength test 6. Ply Adhesion 7. Abrasion resistance 8. Surface scratch resistance 9. Hardness test 10. Customized test We take back the samples and spent a lot of time to test the flooring performance to ensure the flooring quality. We will try our best to ensure our customer benefit, assist them to find issues, solve issues.          

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A free consultation

We focus on floor inspections only, we try to help you to solve all the questions in flooring line.