Where are they still building residential construction with 2x4 studs on exterior walls as pictured in this video? That would be an R 11 insulated wall. Or is this an old movie set recycled from the 70s?
In Vermont we sometimes do "cold roofs" which are meant to prevent ice dams at the eaves. On an addition to my home I laid 1x3 t&g roughsawn spruce over recycled antique handhewn rafters. Over this went a 6 mil vapor barrier. O top of each rafter I put a 2x6 on edge and carefully fitted rigid foam insulation panels between these rafter extensions, leaving an inch of air space above the foam. One inch rough sawn boards sheathed the roof with recycled roof slates above. The eaves and ridge are vented. While the R value of the roof is not up to current standards, I have never seen an ice dams on this roof.
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