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We designed a triple-stud frame construction with our vapour barrier on the second stud frame. This allows the vapour barrier to still be on the “warm” side of the wall (with 2/3 the insulation still being outside the vapour barrier) while giving us an installation cavity to install our HVAC, plumbing, data, and electrical without perforating our vapour barrier. With 17” of blown in, and wet-set, cellulose we have an r-value of 68 in our walls. The installation cavity and placement of our vapour barrier as well as the quality of windows and craftsmanship resulted in an ACH of .2 — three times as tight as we needed, to reach Passive House, and resulting in one of the tightest homes in Canada.