Question

In all of the other walls in other parts of the building with the CMU and brick walls there are small openings, which are mostly for ductwork but also some for piping, cable trays and other misc. There are 32 locations where there are 18” x 18” openings in the CMU, 17 that are 12” x 12” and 21 that are 24” x 24”. What amount of block would typically be deducted from the estimate total to account for these openings?  

Answer 1

Given data: - small openings in the walls for the work of work, piping cable trays and works size of openings no.of openings 18^11 times 18^11 31 12^11 times 12^11 17 24^11 times 24^11 21 Area to deduct fa openings 32 no 18^11 times 18^11 = 10,368 17 no 12^11 times 12^11 = 17 times(12 times 12) = 2,448 inch 21 no 24^11 times 24^11 = 21 times (24 times 24) = 12096 inch total area = 10,368 + 2,448 + 12,096 = 24,912 inch = 173 inch volume to deduct for openings volume = Area times width of the wall = 173 times 0.333 feet^3 Rightarrow 57.69 cu. feet (Assume = 4 thickness wall = 0.333 feet) The volume will charge depending upon the thickness of wall 1 = 576.9 ft^3 2 = 115.218 ft^3