Non-Condensing Roof Insulation: Difference between revisions
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(Created page with "We need a total minimum R-value of R-49. Of those, at least R-15 must consist of air-impermeable rigid insulation. Technically, we're in zone 5A, but right on the border of zone 4A, so I'm using 4A values: https://codes.iccsafe.org/content/IRC2021P3/chapter-8-roof-ceiling-construction#IRC2021P3_Pt03_Ch08_SecR806.5") |
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We need a total minimum R-value of R-49. Of those, at least R-15 must consist of air-impermeable rigid insulation. | We need a total minimum R-value of R-49. Of those, at least R-15 must consist of air-impermeable rigid insulation. | ||
That means 2 layers of 2" [https://www.menards.com/main/building-materials/insulation/foam-board-insulation/r-8-laminated-expanded-polystyrene-2-x-4-x-8-foam-board-insulation/1632120/p-1444435971616-c-5779.htm] | |||
Technically, we're in zone 5A, but right on the border of zone 4A, so I'm using 4A values: https://codes.iccsafe.org/content/IRC2021P3/chapter-8-roof-ceiling-construction#IRC2021P3_Pt03_Ch08_SecR806.5 | Technically, we're in zone 5A, but right on the border of zone 4A, so I'm using 4A values: https://codes.iccsafe.org/content/IRC2021P3/chapter-8-roof-ceiling-construction#IRC2021P3_Pt03_Ch08_SecR806.5 | ||
Latest revision as of 23:52, 4 August 2025
We need a total minimum R-value of R-49. Of those, at least R-15 must consist of air-impermeable rigid insulation.
That means 2 layers of 2" [1]
Technically, we're in zone 5A, but right on the border of zone 4A, so I'm using 4A values: https://codes.iccsafe.org/content/IRC2021P3/chapter-8-roof-ceiling-construction#IRC2021P3_Pt03_Ch08_SecR806.5