Which type of roofing system requires a minimum spacing of 3/8" between wood shakes?

Wood shake roofing requires a minimum spacing of 3/8" between wood shakes to allow for proper ventilation, expansion, and contraction. This spacing is crucial for the longevity of the roofing system, as it helps prevent moisture buildup beneath the shakes, which can lead to mold growth and deterioration of the wood over time. Proper spacing also ensures that the shakes have enough room to expand during periods of high humidity and contract during dry times, minimizing the risk of warping or splitting.

In contrast, metal roofing, single-ply roofing, and tiled roofing systems have different installation requirements and do not rely on shake spacing for ventilation and performance. Metal roofing typically has interlocking panels that create a watertight seal, and any necessary expansion methods are built into the design of the panels themselves. Single-ply roofing involves large sheets that are laid out and secured without the need for spacing like that in shake roofing. Tiled roofing has its own structural considerations based on the weight and interlocking nature of the tiles, focusing on the proper underlayment and installation methods for water drainage.