26 Dec '11, 10am

Green News: Striving for Passivhaus Affordability

For builder Christian Corson, low numbers are good numbers. His current project, a 1,600-sq.-ft. two-bedroom Passivhaus in Knox, Maine, has been testing well and not costing much. A few months ago, for example, with just the rough shell in place – oriented-strand board sheathing on a timber frame, all taping done, and windows installed and sealed in place – the building showed 0.545 air changes per hour at 50 Pascals pressure difference. There have been four blower-door tests since. The most recent, with construction essentially complete, Corson says, showed 0.286 ach – notably below the 0.6 ach Passivhaus requirement. In addition, the building’s annual heat demand is now at 3.1 Btu per sq. ft. – again well below the Passivhaus requirement, which is 4.75 Btu per sq. ft. (Modeling is based on 7,345 heating degree days.) But the other encouraging low number, Corson adds, is ...

Full article: http://www.greenbuildingadvisor.com/blogs/dept/green-buil...

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7 Pioneer Passivhaus Projects of 2011

7 Pioneer Passivhaus Projects of 2011

jetsongreen.com 30 Dec '11, 7am

movement in the US was on a major tear in 2011 but for that awful split between PHIUS and international PHI. The standard ...