28 Feb '15, 6am

@styrohome Foam is not THE answer. #siprot

OK, we do this all the time, mostly in retro-fit situations, but it is really quite simple. Do not use SIPS, use Nail-Base Panels (Insul-lam is a local brand name for them). The Nail-Base product is like a SIPS panel with foam on only one side. We prefer to have them shipped with 5 1/4" of foam on the OSB, and a second layer of 4" foam to install underneath, with seams staggered between the two layers. This makes for a total foam thickness of 9 1/4", which allows a standard 2x10 to be used for sealing up the gable ends, and a 2x12 ripped to the appropriate angle will work for the eaves. The panles are available in larger sizes, but for this application, 4'x8' panels are the least costly, and will work just fine. Now for the installation part: The type of spray-foam that comes in a can is not a very good air barrier, but it does provide good insulation value. The proprietar...

Full article: http://www.greenbuildingadvisor.com/blogs/dept/qa-spotlig...

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