31 Oct '13, 9am

Energy Solutions: A Vilified Insulation Material From the 1970s Returns

Energy Solutions: A Vilified Insulation Material From the 1970s Returns

In reality, the R-value of an 8-inch CMU wall insulated with amino foam is highly dependent of the density of the concrete. With very low-density blocks — 85 pounds per cubic foot (pcf) — two-core blocks insulated with this insulation provide a whole-wall R-value of 11.3. With heavier (more dense) concrete blocks the R-values drop. With medium-density blocks (105 pcf) the whole-wall insulating value drops to R-8.2, and with high-density block (125 pcf), the whole-wall R-value drops to R-6.0. The dramatic difference between the R-value of the foam insulation alone and insulated concrete blocks results from thermal bridging Heat flow that occurs across more conductive components in an otherwise well-insulated material, resulting in disproportionately significant heat loss. For example, steel studs in an insulated wall dramatically reduce the overall energy performance of the...

Full article: http://www.greenbuildingadvisor.com/blogs/dept/energy-sol...

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