Over what maximum joist spacing should end joints in lumber used as subflooring occur?

When determining the maximum spacing for joists that will support end joints in lumber used as subflooring, it's crucial to ensure structural integrity and adequate load-bearing capacity. The correct answer indicates that end joints in subflooring should ideally occur at a maximum spacing of 16 inches.

This spacing helps to distribute loads evenly across the structural framework while providing sufficient support to the subflooring materials. When joists are spaced more than 16 inches apart, the potential for sagging or deflection increases, which can lead to squeaky floors and other structural issues. Additionally, proper spacing helps to minimize movement at the joints, which can further enhance the durability and functionality of the flooring system.

Building codes and construction best practices often prescribe 16 inches as a standard for joist spacing in residential construction, particularly for subfloor systems, to ensure a stable and reliable finish. Therefore, adhering to this guideline is essential for maintaining the quality and safety of the flooring installation.