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Understanding the ASHRAE 90.1-2010 Energy Code Adoption by States

On October 18, 2013, the Department of Energy mandated that all states adopt ASHRAE Standard 90.1-2010 as their minimum energy code, forming part of the IECC 2012. This includes essential requirements such as: CI for steel-framed buildings in climate zones 3-8, maximum fenestration limited to 40% of wall area, and mandated air barriers. The standard emphasizes proper sealing of sheathing joints and all penetrations. Compliance encourages the usage of materials like Dryvit Backstop NT and Aqua Flash. This shift aims to enhance building energy efficiency nationwide.

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Understanding the ASHRAE 90.1-2010 Energy Code Adoption by States

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  1. October 18, 2013 “All states shall adopt ASHRAE Standard 90.1-2010 (part of IECC 2012) as their minimum energy code by October 18, 2013” – DOE Mandate • Same CI requirements as ASHRAE 90.1-2007 / IECC 2009 • Steel framed – CI required for climate zones 3 – 8 • Maximum Fenestration (window) at 40% of wall • Requires Air Barrier and Transition Detailing • Sheathing joints and all penetrations shall be, “wrapped, sealed, caulked, gasketed, or taped” • Creates Demand for Dryvit Backstop NT and Aqua Flash

  2. IECC 2012 • IECC divides the US into 8 climate zones

  3. Prescriptive R-value Wall Design Path IECC TABLE 502.2(1) and 402.2 BUILDING ENVELOPE REQT’S – OPAQUE ASSEMBLIES DOE Mandate effective October 18, 2013 is based on ASHRAE 90.1-2010 not IECC 2012

  4. CALGreenCode – 2010 • Performance option only – similar to IECC 2009 Warmer Marine Colder

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