![]() ![]() Now for the first time in over 18 years, ASHRAE has proposed increases to the minimum required roof and wall insulation levels in Standard 90.1, the national model energy code for commercial buildings. Incredibly, many of the commercial building insulation levels in ANSI/ASHRAE Standard 90.1-2004 contain thermal envelope R-value levels that have not been significantly improved or strengthened since 1989.
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