2018 IECC Component Performance Alternative

Based on the Massachusetts amendment to Sections C401.2 and C402.1.5 of the 2018 IECC, the IECC component performance alternative (sometimes referred to as the “backstop calculation”) is required in Massachusetts for projects following ASHRAE 90.1-2016 Appendix G (or ASHRAE 90.1-2013 Appendix G if following the Stretch Energy Code).  This will require a minimal prescriptive compliance for the exterior envelope in addition to the thermal performance established by using Appendix G.  The impacts of this amendment diverge from previous iterations of energy efficiency design compliance and should be reviewed by key project stakeholders including the project architect, mechanical engineer, and envelope consultant.

Please do not hesitate to contact us if you have energy code scoping questions and how they apply to your specific project

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