How to Prevent Composite Decking from Warping

As outdoor living becomes more prevalent, many outdoor venues have started to build leisure areas, and composite decking has become the mainstream choice for courtyards and outdoor leisure areas. Composite decking boasts excellent outdoor properties such as being waterproof, crack-resistant, and maintenance-free without the need for painting. However, homeowners occasionally report that composite decking may deform after installation.

Causes of Composite Decking Deformation

Thermal Expansion and Contraction

Composite decking, like all outdoor flooring materials, exhibits the physical property of thermal expansion and contraction. It undergoes natural expansion and contraction influenced by ambient temperature and humidity.

Long-Term Exposure to Moisture

While composite decking has excellent waterproof properties outdoors, long-term exposure to moisture, prolonged contact with water, or excessive humidity can lead to deformation and warping. Therefore, it is crucial to choose high-quality composite decking materials, such as Sundi composite decking, which rarely encounter such problems. Additionally, proper and correct installation methods must be employed to maximize the value of the composite decking, providing a more comfortable and cozy living environment.

How to Prevent Composite Decking Deformation

Reserve Appropriate Expansion Joints

Leaving gaps can provide the necessary expansion space for the flooring, preventing problems like deformation, cracking, or warping caused by seasonal changes or humidity differences. Gaps also facilitate air and moisture circulation, promoting airflow beneath the flooring to prevent dampness and mold, thereby extending the flooring's lifespan. During installation, gaps make it easier for workers to splice and secure the flooring, ensuring flatness and stability. Moreover, in daily use, gaps reduce the difficulty of cleaning and maintenance, preventing debris and moisture from accumulating in the gaps of the composite decking.

Ensure Adequate Ventilation and Drainage Underneath

When installing composite decking, the ground should be pre-specified with a 1-2° drainage slope, and the flooring must be installed on a joist frame structure to ensure sufficient drainage and ventilation space between the flooring and the ground.

Gap Size

The gap size when installing composite decking needs to be determined based on the specific installation environment and flooring type. Generally, it is recommended that the width of the gaps be between 3-6 millimeters. Factors such as the length of the flooring, its expansion rate, and the specific conditions of the installation area will also impact the gap size. Therefore, practical installation should involve reasonable adjustments based on specific factors.