I am building an icf house in climate zone 5 and am having trouble finding a fastening schedule for the top layer of sheathing. I am sandwiching 5 1/2″ of polyiso between 5/8 and 1/2 sheathing. Roof slopes from 4/12 to 12/12. Any help would be appreciated. Plan on using #14×8″ wood screws to fasten through the assembly into the trusses.
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