Further it provides minimum performance requirements of the continuous air barrier materials and assemblies. This section also defines how the air barrier shall be designed, noted, and installed. Section 5.4.3 of the standard calls for the entire building envelope be designed and constructed with a continuous air barrier. In the 2010 edition of ASHRAE 90.1 a significant change was added to require a continuous air barrier to help achieve their workplan goal of reducing energy costs by 30% compared to the 2004 version of the standard. Utilization of on-site, renewable energy resources.
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