Approximately how many concrete block units are required for the stem wall between the two bay areas on the north side of the house?

To determine the number of concrete block units required for the stem wall, it's important to consider the dimensions of the wall that needs to be constructed. The calculation typically involves figuring out the total length and height of the stem wall, and then dividing that total area by the area of a single concrete block unit.

Concrete blocks usually have standardized dimensions, often around 16 inches long, 8 inches high, and about 8 inches deep. When calculating the total number of blocks for the wall, the height and length should be converted to the same units as the block size (usually inches or feet), and the area of the wall can then be found by multiplying these dimensions.

Using the information given with the construction's unique parameters—such as the length and height of the stem wall on the north side of the house—if calculations show that approximately 128 blocks are required, this indicates that the dimensions of the wall align effectively with the block size and yields a total that matches the required number.

To summarize, the choice of 128 blocks is likely derived from a careful measurement and calculation process that reflects the actual needs for constructing the stem wall, taking into account the concrete block size and the specific design of the structure.