What is the required spacing between panels when installing roof sheathing?

When installing roof sheathing, a spacing of 1/8 inch between panels is often recommended. This slight gap allows for the natural expansion and contraction of the materials as they are subjected to temperature changes and moisture variations. Without this spacing, panels could swell and push against each other, potentially leading to warping, cracking, or other structural issues over time.

Proper spacing is crucial for maintaining the integrity of the roofing system. It helps to ensure adequate ventilation and minimizes the risk of moisture accumulation, which can lead to mold or rot in the underlying structure. The recommended gap serves to balance the need for a unified surface while still accommodating the natural behaviors of the materials used in the roofing process.

In contrast, options such as butt tight with no gap could lead to complications, given that materials will fluctuate with environmental changes. Wider gaps like 1/4 inch or 1/2 inch may also be unnecessary and could create vulnerabilities for wind uplift and water ingress. Therefore, the 1/8 inch spacing strikes the right balance for effective roof sheathing installation.