How much separation do wood shakes require to allow for expansion and contraction?

Wood shakes require a specific separation to account for the natural expansion and contraction that occurs with changes in humidity and temperature. The recommended spacing of 3/8 inch to 5/8 inch allows sufficient room for the shakes to swell when they absorb moisture and to contract when they dry out. This spacing helps to prevent the shakes from warping or buckling, which can lead to compromised structural integrity and potential leaks in the roofing system.

Using improper spacing may lead to issues such as water infiltration, reduced lifespan of the roofing material, or increased maintenance needs. The specified range also ensures that air can circulate around the shakes, promoting drying and reducing the risk of mold or rot that could arise from trapped moisture. Therefore, maintaining the correct separation is essential for both the performance and longevity of wood shake roofs.