Changes Proposed for Standard 90.1 Address Metal Buildings

Changes to assembly descriptions and U-Factors regarding metal building roof and wall assemblies are being considered in the 2010 version of ASHRAE Standard 90.1, expected to be published in the fall. All architects, engineers, contractors, code compliance officials, and building owners should be aware of these revised U-Factors to ensure that the buildings they design, build, inspect, and occupy actually comply with the intended minimum thermal performance requirements of current energy codes and standards.

The assembly descriptions and U-Factors proposed for inclusion in Standard 90.1-2010 are available here. This excerpt contains items from the first public review draft of “addendum bb” to Standard 90.1 that did not change in the second public review draft that was completed in late December. Items that received comments in the second public review draft were discussed by the Standard 90.1 committee at the ASHRAE Winter Conference in January.

More Information: ASHRAE Press Release