Evaluating metal roof assemblies

Research reveals the thermal performance of highly insulated metal roof assemblies

Editor's note: The following article was adapted from "Thermal Performance Evaluation of Innovative Metal Building Roof Assemblies," which was presented at the International Symposium 2011: Emerging Technologies and Roof System Performance.

Recently, the stringency of energy codes has come into sharp focus with lawmakers and elected officials calling for greater energy efficiency in the codes. Several stakeholders—such as the Department of Energy; The American Institute of Architects; American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE) Inc.; and other influential groups—have developed plans to move the energy codes toward specific improvement targets.

Currently, ASHRAE 90.1, "Energy Standard for Buildings Except Low-Rise Residential Buildings," provides minimum standards for the energy efficiency of commercial buildings. ASHRAE's plan was to develop a 2010 edition of ASHRAE 90.1 that would provide 30 percent more energy savings compared with the 2004 edition. To meet this challenge, a number of significant changes to the standard needed to take place for design requirements in lighting, HVAC equipment and various building envelope improvements.