Massachusetts Unrestricted Construction Supervisor License Practice Test

How far apart must full depth blocking be spaced for joists under bearing partitions in single family dwellings?

1. 6 feet on center

2. 4 feet on center

3. 8 feet on center

4. 10 feet on center

The correct answer is: 4 feet on center

For full depth blocking under bearing partitions in single-family dwellings, the correct spacing requirement is four feet on center. This specification is based on structural support principles. Full depth blocking is used to provide additional support and transfer loads from the bearing partition to the floor joists, helping to maintain stability and prevent sagging or structural failure. Spacing the blocking too far apart may compromise the structural integrity, as it could lead to inadequate load distribution. By following the four-foot spacing guideline, builders ensure that the load is evenly supported, maintaining the integrity of the framework and contributing to the overall resilience of the structure. Other spacing options, such as six, eight, or ten feet on center, do not meet the code requirements for full depth blocking under bearing partitions. Using these wider spacings could risk insufficient support for the bearing walls, potentially leading to significant structural issues over time. Thus, adhering to the four-foot spacing ensures the building's safety and stability.