For thousands of years, wood has been one of mankind’s most trusted building materials. It’s strong for its weight, easy to shape, naturally beautiful, and incredibly versatile. In fact, doors were among the earliest wooden products ever crafted — offering both security and architectural presence. What makes wood so special is its individuality. Every board carries its own grain pattern, color, and texture — shaped by the tree it once was. With countless species available, wood can dramatically influence the character and mood of a space. Simply put, no other material rivals wood for custom doors.
Understanding How Wood Moves
Wood is a natural, living material — and it responds to its environment. Changes in relative humidity (RH) cause wood to absorb or release moisture. As humidity increases, wood swells; as it decreases, wood shrinks. A 10% change in humidity can result in roughly a 1% size change across the grain. (If you’ve noticed deck boards tightening in wet weather and separating in dry conditions, you’ve seen this in action.) While wood remains stable lengthwise, movement across the grain must be considered in design and installation.
Engineering for Stability
Quality wood products are built to accommodate normal seasonal humidity shifts in climate-controlled homes and offices. Protective, moisture-resistant finishes help buffer these changes and reduce risk of warping or cracking. Material choice also matters. Plywood, for example, has only 5–10% of the shrinkage of solid wood due to its cross-grain construction. Alternating grain directions in each layer restrict movement, making plywood ideal for larger panels that must remain flat as humidity changes.
Storage Matters
Even well-crafted wood products can experience issues if stored improperly. Wood should be kept in controlled conditions prior to installation and remain wrapped to prevent moisture absorption. If wood absorbs excess moisture during storage and is later installed in a dry, climate-controlled space, it can shrink excessively as it acclimates. Maintaining proper storage and finishing practices ensures optimal long-term performance.
A Renewable, Responsible Choice
Wood is also one of nature’s most renewable resources. In the United States, forest growth has exceeded harvest for decades — we are not running out of wood. When responsibly sourced and properly crafted, wood remains one of the most sustainable and enduring building materials available.