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.
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Educational topics are provided in both long-program and topic-focused form, so that users can more easily create a custom program with information that is relevant to their audience (i.e. specifiers, building officials, etc.).
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