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I consider a conditioned attic a "Must" for the hot/humid south. All my ducts are inside the envelope.
Open cell foam does a nice job of thoroughly insulating this house.
2x6 - 24" OC Stud walls are my preference for R-21 with 5.5" of foam
Advanced Framing: 2 Stud or CA Corner allows foam all the way to the edge.
Looking up at a R-10 Insulated Header using 2 layers of 3/4" R-5 rigid foam.
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