Airspace R-Value

Research Report No.: 
Issue Date: 
Monday, September 19, 2016 - 11:45
Update Date: 
Thursday, January 14, 2021 - 11:45

The presence of an airspace enclosed within a building envelope assembly is known to contribute to the overall thermal performance of the assembly. But, the actual R-value of an airspace can vary significantly depending on various conditions of use, such as the air-tightness of the assembly of materials enclosing an airspace. This research report reviews current technical knowledge and regulatory requirements to provide guidance for appropriate R-value characterization and limitations of use for airspaces within building assemblies for code compliance.

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