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Our wall system forms part of a set of two-family and three-family designs that we developed for a 36-unit multifamily cohousing project in Belfast, Maine. The design is guided by the Passive House building standard, and the finished buildings meet the criteria for Passive House certification. (However, it's up to the individual homeowners to apply for formal Passive House status, and so far none of the homes are officially certified.)The wall system consists of an inner stick-framed 2x4 stud wall, insulated to R-13 with dense-packed blown cellulose (A). Outboard of this wall, we apply 8 1/4-inch-thick, R-32 SIPs (structural insulated...

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