Am I making a mistake building my house with a sealed attic?
I am building my own home and I want it to last for my son, and be energy efficient. My plan is to build it with a sealed attic with spray foam on the underside of the roof decking. On the top side I want to use a synthetic roof paper covered with a preferred radiant barrier. Then put down 1×4 vertical battens, and then a layer of 2×4 horizontal battens, and finally my metal roof.
My thinking was, since the roof can draw air at the bottom and vent it out of the top I should drastically reduced the amount of heat entering the attic. Any moisture under the metal would be dried by the air flow. And if I used open cell foam moisture could actually dry out of the attic and through decking.
But the more I read on it all the more I get confussed.
Can someone tell me the best practice for central Arkansas which is zone 3a?
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