Do wood baseboards expand or contract with changes in temperature and humidity?

Yes, wood baseboards do expand and contract with changes in temperature and humidity. Wood is a hygroscopic material, meaning it absorbs and releases moisture from the surrounding environment. When the humidity levels increase, wood absorbs moisture from the air and swells, causing it to expand. Conversely, when humidity levels decrease, wood releases moisture and contracts.

Temperature changes can also affect the dimensions of wood baseboards. As the temperature rises, wood expands, and as it cools, it contracts. This expansion and contraction can cause the wood baseboards to warp, buckle, or develop gaps between joints if proper precautions are not taken during installation.

To minimize the effects of expansion and contraction, it's essential to leave expansion gaps when installing wood baseboards. These gaps allow the wood to expand and contract without causing damage to the surrounding structures. Additionally, using appropriate fastening techniques, such as allowing the baseboards to float or using flexible adhesive, can help accommodate these dimensional changes.