27 Jun '15, 3pm

Best Insulation Practices in Quebec, Zone 7

Best Insulation Practices in Quebec, Zone 7

It really depends on the thickness & types of spray foam & foam board. A flash-inch of closed cell polyurethane foam isn't sufficiently tight to qualify as a vapor barrier under Canadian code, but it almost is. (In practical terms it's "as good as..." ). Unfaced Type -II EPS doesn't get there until it's more than 3" thick. Closed cell foam thermally bridged by studs is a waste of good foam though. While the center-cavity R can be quite high, the thermal performance of the wall is limited by the heat conducted through the framing fraction. A full cavity fill of R6/inch closed cell foam in a 2x4 cavity adds only about R2 to the whole-wall performance over what R13 cellulose cavity fill or R15 rock wool would deliver. Save the foam budget for fatter exterior foam- it'll buy a lot more performance per dollar, and it buys more moisture resilience too. If you put 4" of EPS on th...

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

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