The 2007 version of ANSI/ASHRAE/IESNA Standard 90.1 has been released by ASHRAE
The 2007 version of ANSI/ASHRAE/IESNA Standard 90.1, Energy Standard for Buildings Except Low-Rise Residential Buildings has been released by the Atlanta-based American Society of Heating, Refrigerating, and Air-Conditioning Engineers (ASHRAE). The new standard provides minimum requirements for energy-efficient design of buildings that are not low-rise residential buildings.
The 2007 version of Standard 90.1 includes an increase to the minimum required prescriptive R-value (resistance to heat flow) for roof and wall insulation levels. The above-deck roof insulation requirements currently at R-15 increase to R-20 in every climate zone throughout the United States. Similar increases were approved for walls.
