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Roof Equipment

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What is the common practice for anchoring roof top mounted equipment based on the '97 UBC? Per Table 16-O, 3),C), an Ap of 2.5 and Rp of 3.0 is required. Using Formula 32-2 with Ca=0.57, I'm coming up with 1.36W, (ASD). Has it really increased this much over the older codes?
 
Thanks in advance,
 
Larry Hauer, S.E.