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• 23:50, 4 August 2025 Marcin talk contribs created page Non-Condensing Roof Insulation (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")