Lyndon S
12/29/2009
I have a new house currently under construction. The studs, ceiling joists, and rafters are all on 16" centers. The roof is a hip roof with a 7/12 pitch. The roof has been decked with 7/16" OSB and covered with 30lb felt. The longest metal panels will be 30' from the ridge to the end of the overhang. The house is in a 90 - 100mph rating according to the ASCE Wind Zone Map. 1: Will 7/16" OSB hold a metal roof without the screws pulling out? 2: Would it matter if I was using exposed fasteners, consealed fasteners, or a true standing seam that floats on clips? 3: If I install 1 x 4 purlins horizontally as a stronger material in which to insert screws then any water leaks would be trapped behind the 1 x 4s and could never escape. Knowing this, would installing 1 x 4s be worth the extra expense? 4: If I don't install the 1 x 4s, do I need to put anything over the felt before laying down the metal?
Lyndon S
12/29/2009
The house is 48' x 90'.
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