One. Why do solid wood doors expand?
1、High moisture content in the wood gradually decreases during use, leading to the manifestation of internal stresses in the wood, causing the solid wood door to expand and crack/deform.
2、Due to various factors during the growth of natural wood, the wood exhibits uneven density. once the wood is cut, the internal stresses are disrupted, which can cause the solid wood doors made from this wood to expand.
3. Improper installation of solid wood doors can also cause expansion and deformation. For example, improper drying, shallow back slots, and failure to leave adequate expansion joints during installation can all lead to expansion and deformation of the doors.

Two. What should I do if a solid wood door swells and won't close?
1. When solid wood doors become difficult to close due to swelling, we first check if the excessive friction between the bottom of the door and the floor is the cause. If the friction is excessive between the bottom or top of the door and the floor, the flooring can be re-aligned.
2. Alternatively, hire a construction worker to remove a portion of the bottom or top of a solid wood door and then re-edge the solid wood door, allowing the door to open and close freely.
3. Alternatively, you can use a wood chisel to remove the swollen edges of the solid wood door until it can be opened and closed freely.
4、Solid wood doors are susceptible to expansion and contraction due to temperature and humidity changes. If possible, replace them with waterproof doors or doors with better moisture resistance.
5. Alternatively, reapply a waterproof material on solid wood doors, which can effectively enhance the water resistance of solid wood doors and prevent them from swelling due to moisture.