29 Jun '12, 9am

Energy Nerd: How to Insulate a Basement Wall

Exterior insulation keeps the concrete within the home’s thermal envelope; this increases the amount of interior thermal mass Heavy, high-heat-capacity material that can absorb and store a significant amount of heat; used in passive solar heating to keep the house warm at night. and reduces the likelihood of temperature swings if heating and cooling equipment stops working. (However, it’s worth pointing out that the advantages of interior thermal mass are often exaggerated.) Insulating on the exterior allows a builder to install an uninterrupted layer of rigid foam from the foundation footing to the rafters. While this approach isn’t required — you don’t have to insulate above-grade walls with exterior foam if you don’t want to — many builders like it. Exterior insulation provides more interior space in your basement than interior insulation. It’s easier to insulate and ai...

Full article: http://www.greenbuildingadvisor.com/blogs/dept/musings/ho...

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