Approximately how many 12-inch concrete block cells will require a #5 rebar?

When determining how many 12-inch concrete block cells will require a #5 rebar, one must consider the structural requirements for reinforcement within concrete masonry units. A #5 rebar is commonly used in construction for its strength and is usually placed in every block cell that requires supplemental reinforcement, especially in load-bearing walls or seismic areas.

Typically, in standard practice, every third or fourth cell in a block wall is filled with rebar, depending on the structural design and the engineering specifications. For instance, if a typical wall consists of a certain number of blocks, you would divide that overall number by three or four to estimate how many cells need a #5 rebar.

Given that option B suggests 25 cells, this aligns well with common engineering practices, retaining structural integrity while not over-reinforcing the wall unnecessarily. The choice maintains a good balance between strength and material efficiency. Thus, selecting 25 cells as the amount requiring #5 rebar effectively reflects these considerations in real-world applications.

This method of estimating allows for both adherence to safety standards and the support requirements of the structure being built, ensuring long-lasting stability and compliance with building codes.