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by andrewksu
3775 days ago
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R-Values. Exponential going the wrong direction. After R-15 or so you slip into the long tail. Good article here- http://www.energyvanguard.com/blog-building-science-HERS-BPI... PH is performance based, but the religion is a bit excessive on R. I do greatly value the air tightness and the quantitative approach. High R-Value walls are tough to build and get expensive quick. Double wall, exterior sheathing, more parts, more fasteners, etc. We use SIPS walls/roof that have very good R, very little thermal bridging and outstanding air tightness while being fast to build. |
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