The external wind pressure acting on a roof depends on
A. Degree of permeability of roof
B. Slope of roof
C. Both (A) and (B)
D. None of the above
Answer: Option B
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Degree of permeability will be needed only if the total pressure acting on the wall is asked
Here both b upto (25mm rivet) and C (more than 25mm rivet) option also satisfy the bolt hole dia. So, consider most appropriate answer should be gross dia of hole is A