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These recommendataions are cost-effective levels of insulation based on the best available informqation on local fuel and materials costs and weather conditions. Consequently, the levels may differ from current local building codes. In addition, the apparent fragmentation of the recommendations is an artifact of these data and should not be considered absolute minimum requiremenets.
DOE Insulation Calculator www.ornl.gov/~roofs/zip/ziphome.html

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last updated 1 Aug 2007