What is the maximum spacing for double floor joists that are separated to allow installation of piping?

The correct spacing for double floor joists that are separated to allow installation of piping is set at a maximum of 4 feet on center. This specification ensures adequate support for the structure while providing enough room for piping installation without compromising the integrity of the floor system. Proper spacing is crucial to maintain load-bearing capacity and structural stability, especially in areas where additional mechanical elements, like piping, are introduced.

In this context, spacing the joists too far apart could lead to insufficient support, which might result in sagging or failure over time under the design loads. The chosen spacing of 4 feet strikes a balance between accessibility for installation and compliance with building codes and safety standards, ensuring that the structural system can effectively bear the loads while allowing for necessary modifications.