Yes, Cellular PVC decking will react to changes in temperature. When the decking is exposed to heat, it will expand, and when it is exposed to cold, it will contract. The amount of expansion and contraction will depend on the specific decking product, as well as the temperature changes and other environmental factors.
Different manufacturers have different specifications for the effect and suggestions to counteract it. Veka decking, for example, is made with a patented formula that expands and contracts less than 0.05%, allowing for end-to-end butt joints.
Most manufacturers suggest spacing deck boards at least 1/8″ side-to-side and end-to-end. More spacing should be allotted if the temperature is below freezing during installation.
If you have additional questions about decks or other subjects, we’re happy to answer them. Please call us at 613-736-1122, or click the chat button on the right during business hours.