How much gap is typically left between floor sheathing panels to allow for expansion?

Leaving a 1/8" gap between floor sheathing panels is a standard practice to accommodate expansion and contraction due to changes in temperature and humidity. This small gap helps prevent buckling or warping of the panels as they swell or shrink. It is crucial in wood materials, which are naturally susceptible to moisture levels in the environment. Over time, if panels are placed too closely together without adequate spacing, they can create pressure and lead to structural issues. The 1/8" gap strikes a balance: it is sufficient enough to allow for expansion while remaining small enough to ensure a solid, even flooring surface without noticeable joints.