What is the most appropriate method of bridging/blocking for a non-engineered floor?

In the context of non-engineered floors, cross-bridging is the most effective method for providing additional stability and strength to the floor system. Cross-bridging involves placing blocking between joists at an angle, typically forming an "X" shape. This configuration helps to distribute loads more evenly and counteract lateral movement caused by foot traffic or other forces.

The spacing of 7 feet on center maximizes the structural integrity of the floor without overloading the connections or compromising the system's performance. It prevents excessive deflection and ensures that the floor is stable, thereby reducing the risk of vibrations and squeaks that can occur with improper bridging techniques.

Other bridging methods, such as parallel bridging or single blocking, may not provide the same level of support or effectiveness in preventing lateral movement and distributing loads, which is critical for non-engineered situations where the engineered design principles may not be as thoroughly established. Hence, while other methods may provide some benefit, cross-bridging at the specified spacing presents the most reliable solution for maintaining the strength and stability of a non-engineered floor system.