Unvented, conditioned attics
Ventilation of attic spaces is viewed by many in the roofing industry as a technical requirement for steep-slope roof assemblies and often is substantiated as being a building code requirement. But this viewpoint is changing.
During the International Code Council's (ICC's) 2003-04 code development cycle, the U.S. Department of Energy submitted and ICC accepted sweeping changes to ICC's energy-efficiency requirements, including a provision in the International Residential Code (IRC) allowing unvented attics, or "conditioned attic assemblies," in certain situations.
As a result, the upcoming 2006 edition of IRC will allow unvented, conditioned attics when the following four conditions are met:
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