28 Jun '15, 6pm

How the heck was Pittsburgh, PA named a green city?!

Just curious, but what's the magic of SIPs, for you? They're easier to air-seal than stick built, but when all the insulation is 1.5 polystyrene (or worse, 2lb polyurethane) the lifecycle environmental impact of the polymer is pretty high. An EPS core SIP may be "green enough" at code min, but at higher R, not so much. In a US zone 5A location R13 2x4 + R5 insulating sheathing is code min, which has a whole-wall R of about R15 "whole wall" after factoring in the thermal bridging and adding the insulating value of the structural sheathing, wallboard and siding. To hit that with an EPS core SIP takes a 5" SIP, which has ~4" of foam a bit more than 2x the amount of foam it takes to do with an R13 + R6 (1.5" EPS) assembly that's slightly better than code min. If you want to go 1.5x code min you'd need R22-R23 whole-wall, which can be done with 2x6/R20 + 2" of EPS (or rigid roc...

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

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