29 Mar '12, 2am

Green Building Q&A: What would you do? XPS or EPS or ISO?

I am building a 3000 sq foot home in northern ontario (zone 8 or 9) with about 9000 HHD. I am weighing my options on this wall contruction type. It will be a 2x6 frame with R24 blow in batt in wall cavity and exterior foam insualtion, 1x4 strapping and siding After reading and calculating foam thicknesses(thanks Martin) I would like to get to R20 if possible for the foam giving me a total wall R40+ rating, will be detailing like a REMOTE wall (window bucks) Assume all of these will be taped: I have been able to find EPS 5" thick(R20) non faced - plain white stuff OR 2 layers of 1.5" ISO (foil faced) for a total of 3" (R18) OR 2 layers of 2" xps for a total of 4" (R20) Now the $$$ part EPS is about $3500 ISO is $9500 XPS is $11,500 If i go with EPS, would i need to cover it with a WRB? THere is a Labour saving as well with EPS as it's only 1 layer, but no offsetting joints ...

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

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