I looked at Ballast Practice Exam, #200 asked about building cost comparisons. In the answer explanation, it states: 1. "The higher the perimeter-to-floor area ratio, the greater the unit cost." and
2. "A cubic building costs more than a rectangular building of the same area (because a cubic building has the least amount of exterior envelope compared with a rectangular building. The contractor can also capitalize on economics of scale, the more material purchased, the better the deal)".
I get confused here, isn't that these two are conflict? Suppose a one story cubic building has 40'(W)X40'(L), with perimeter=160' ,and GFA=1600 SF. Perimeter/Floor area=0.1
Another one story rectangular building has 20'(W)X80'(L), with perimeter=200', GFA=1600 SF. Perimeter/Floor area=0.125
If per statement 1, Cubic building cost less, which is different from statement 2. Could someone help to clarify? Thanks!
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