I have an old barn that I need to insulate from the inside. The building has this same style wood lap siding nailed directly to the framing, but was later covered with metal siding. Would you still use option 1 considering the wood is not open to the elements? Is the air gap still needed? The 2x4 framing is actual in dimension so that should give me another 1/2 inch. Also the roof is covered the same way and is an open truss design. How would you insulate that. I am in climate zone 5 and this building would not be heated very high or air conditioned. Thank you
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