When installing floor sheathing panels, what gap is typically left between them to allow for expansion?

When installing floor sheathing panels, leaving a gap of 1/8 inch between the panels is the standard practice to accommodate expansion. Wood and engineered wood products, which are commonly used for sheathing, can expand and contract due to changes in moisture and temperature. A gap of this size is sufficient to allow for movement without causing the panels to buckle or warp, ensuring a stable and durable floor structure.

This gap also helps prevent issues such as squeaking floors that can occur if the panels are tightly abutted and do not have room to expand. Proper spacing is crucial for maintaining the integrity and longevity of the flooring system, particularly in regions where humidity levels fluctuate significantly.