31 Dec '12, 1am

Raised-frame floor above slab #green

I understand the importance of super insulating the underside of a slab with large amounts of XPS foam, especially in my very cold climate (northern Maine). I have run across a unique foundation design of a passive house in Falmouth, MA, by architect Steven Baczek (http://www.deapgroup.com/Falmouth_PH.html ). It involves insulating ABOVE the slab, essentially leaving the slab out of the conditioned space. His design involves 4" of XPS rigid foam resting on top of the slab, followed by 2x8 16" OC boards spanning the slab, resting on a 2x4 strut. 3/4" T+G subfloor covers the 2x8s. Blown-in cellulose fills the cavity underneath raising the R-value to tremendous amounts, which I imagine is significantly less expensive than underslab foam insulating. He weighs the loss of a thermal mass but says the loss is negligible based upon the heating load of the house and amount of insul...

Full article: http://www.greenbuildingadvisor.com/community/forum/gba-p...

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