Concrete shell roofs are not commonly used because
A)they require a relatively large amount of concrete per square foot of floor area.
B)they require prestressing, which substantially raises their cost.
C)they require a relatively large amount of steel reinforcement per square foot.
D)all of the above.
E)none of the above.

Question

Quizplus · Accepted Answer

Concrete shell roofs are not commonly used primarily due to their complex design and construction process, which requires specialized labor and formwork, rather than the reasons listed in options A, B, or C.

Concrete Shell Roofs Are Not Commonly Used Because