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IBC Chapter 13 — Energy Efficiency

Updated Mar 26, 2026
References IECC for energy conservation. Commercial prescriptive, trade-off, and performance paths.

IBC Ch13: references IECC as the energy standard. Commercial: prescriptive (C402-C405), trade-off (COMcheck), or whole-building performance (energy model per C407). Residential: prescriptive (R402), simulated performance (REScheck), or ERI path. Key IECC 2024: continuous insulation on commercial walls, reduced LPD 0.7-1.0 W/sf, economizers on large HVAC, EV-ready infrastructure. Residential: airtightness testing mandatory (3-5 ACH50), R-49+ attic, R-20+ walls, SEER 15+ cooling.

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IBCIECCenergyenvelopeASHRAE-90.1compliance
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code year
2024
code section
Chapter 13
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