Massachusetts Unrestricted Construction Supervisor License Practice Test

How is the spacing for blocking affected when joists are under bearing partitions?

1. Increases to 8 feet on center

2. Requires full depth blocking at 4 feet

3. Can use a maximum of 10 feet on center

4. Is irrelevant as blocking is not required

The correct answer is: Requires full depth blocking at 4 feet

The requirement for full depth blocking at 4 feet when joists are under bearing partitions is crucial for maintaining structural integrity. When a bearing partition is directly supported by the joists below, the loads from the partition must be effectively transferred through the joists to the supporting structure. Blocking provides lateral support to the joists, preventing them from twisting or warping under load. At a spacing of 4 feet, full depth blocking ensures that the joists are adequately braced, especially since they are dealing with additional weight from the bearing partition. This level of support is necessary to maintain the overall integrity of the floor system, preventing potential failures that could arise from inadequate support. Other options hint at varying degrees of support or requirements, but they do not align with the established building codes and best practices for construction. Spacing increases or allowing for extended distances without adequate blocking would jeopardize structural performance, making the need for 4-foot spacing critical when dealing with bearing partitions. This standard not only follows local code requirements but also adheres to safety practices crucial in the construction industry.