14 Dec '12, 12am

Green Building Q&A: Vapor Open Wall Assembly - Multifamily Project in Zone 4

I am working on a new apartment project in Frederick, Maryland (Zone 4). The project consists of several four story wood framed buildings (units only on levels 2-4). We are interested in building above "code minimum" buildings because we are long term holders, want our structures to last, and think it is the wise thing to do. I am persuaded by the benefits of placing insulation on the outside of the wall (the "perfect wall" as described by Building Science Corporation). I have recently been looking at using Roxul ComfortBoard IS as an exterior insulation because of its beneficial properties including resistance to fire, resistance to bugs, resistance to water damage, and because it is vapor open. The wall assembly we are considering would consist of: Cladding (vinyl or hardie) 1x4 vertical furring strip (ventilated rain screen) 1.5" Roxul ComfortBoard IS (vapor open) WRB (...

Full article: http://www.greenbuildingadvisor.com/community/forum/energ...

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