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I am building a 26x40 garage in North Carolina. Will be using 2x10 rafters spaced 24" apart. I plan to install a metal roof. I want to be able to maintain reasonable temps in the garage in the summer and winter so I plan to install R38 fiberglass insulation between the rafters leaving air gap. Plan to use a portable AC unit in the summer and small wood stove in the winter when I am in the garage working.
Would you recommend I install decking and 1x4 purlins, If no decking should I go with 2x4 or 1x4 purlins.
Zoning requirements require my max height to be 17. How much should I allow from top of ridge board to top of metal roof cap for decking, purlins, metal roof and metal roof ridge cap.
With fibrous insulation, it is always recommended that you install solid sheathing to combat any condensation concerns.
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