What does the term "expansion gap" refer to?

The term "expansion gap" specifically refers to a space left for wood movement. Wood is a natural material that can change in size due to variations in moisture and temperature. As wood absorbs moisture, it expands, and as it loses moisture, it contracts. This expansion and contraction can lead to warping, cracking, or other damage if there is no room for the wood to move. Therefore, leaving an expansion gap helps accommodate this natural movement, allowing for structural integrity and the longevity of the flooring or other wood installations. Properly allowing for expansion gaps is essential in carpentry, particularly in flooring applications, where the wood panels need space to expand without pushing against each other or other structures, thus preventing potential damage.