Why do wood doors crack? The most common reason a wood door might crack is due to fluctuating humidity levels.
Humidity refers to the amount of moisture in the air, and it can have a significant impact on wood because wood naturally expands and contracts in response to changes in moisture content.
When the humidity level is high, the wood in a door can absorb moisture from the air, causing it to expand. This can result in the door becoming slightly larger than its frame, making it difficult to close or open. In severe cases, the door may even become stuck in the frame.
Conversely, when the humidity level is low, the moisture content in the wood decreases, causing it to shrink. This can lead to cracks forming in the wood, particularly around knots or other imperfections. These cracks can be unsightly and can also affect the structural integrity of the door.