Insulating vaulted ceiling
I am building a tiny house / cabin and have 2×6 joists my current plan is to use 1/2″ osb on the deck covered with synthetic underpayment then a radiant barrier on top of that follower by 2×4’s strips to gain 1.5″ of air space then attach my metal roofing to that. On the underside I was going to do closed cell spray foam for a sealed roof the. T&G pine over the insulation are there any faults with this plan? I read in a article I should install drywall with a vapor retarding paint then the T&G over then any reason why? Also plan on installing a lunos e2 HRV.
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