29 Jun '15, 6pm

How to Insulate a Foundation

How to Insulate a Foundation

Start with 2 to 3 inches of Type II EPS under the slab, with 2 inches of EPS between the slab edges and the foundation wall. "You can then hit R-15 whole-wall R performance using 1 1/2 inch of EPS or 1 inch of foil-faced polyiso Polyisocyanurate foam is usually sold with aluminum foil facings. With an R-value of 6 to 6.5 per inch, it is the best insulator and most expensive of the three types of rigid foam. Foil-faced polyisocyanurate is almost impermeable to water vapor; a 1-in.-thick foil-faced board has a permeance of 0.05 perm. While polyisocyanurate was formerly manufactured using HCFCs as blowing agents, U.S. manufacturers have now switched to pentane. Pentane does not damage the earth’s ozone layer, although it may contribute to smog. trapped to the foundation wall by a 2x4 stud wall insulated with unfaced (or kraft-faced, but not foil-faced) R-13 or R-15 batts."

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

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