Massachusetts Construction Supervisor License (CSL) Practice Test

Full depth blocking in single-family dwellings is critical for the support of joists underneath bearing partitions. When spacing this blocking, the requirement is to provide adequate support to transfer loads properly from the partitions above to the joists below. Spacing the full depth blocking 4 feet on center is a standard practice that helps ensure that the joists receive adequate support without reducing their structural integrity. This spacing helps distribute the load effectively and minimizes the risk of sagging or failure of the joists, which can lead to serious structural issues in the future. While other spacing options may have different applications in various construction scenarios, using 4 feet on center specifically addresses the need for enhanced support under bearing partitions in single-family dwellings, making it the correct choice for this question.