The New Colorado Model Low Energy and Carbon Code (MLECC) establishes rigorous performance benchmarks for building envelopes, focusing on high-performance insulation and enhanced air sealing to move homes toward net-zero energy readiness.
Insulation Standards
Insulation requirements vary by jurisdiction, with several major areas adopting the most stringent standards:
- Denver, Centennial, and Unincorporated Arapahoe County: These jurisdictions mandate R-49 attic insulation and R-20 wall insulation. To meet the R-20 wall requirement and minimize thermal bridging, these codes typically require the use of continuous insulation, such as polyiso.
- Colorado Springs: Currently maintains slightly lower thresholds, requiring R-38 attic insulation and R-19 wall insulation.
Air Sealing and Building Envelope Requirements
The MLECC introduces several measures to guarantee airtightness and thermal efficiency:
- Enhanced Air Sealing: The code requires advanced air sealing techniques designed to dramatically reduce thermal transfer.
- Duct Leakage Testing: Compliance involves mandatory testing of ductwork to ensure minimal energy loss through the HVAC system.
- High-Performance Windows: To support the building envelope, windows must meet strict thresholds by July 2026. In most jurisdictions (except Colorado Springs), this includes a U-value of 0.30 or lower and a Solar Heat Gain Coefficient (SHGC) of 0.25 or lower.
- Electric-Ready Provisions: New standards include requirements to make homes “electric-ready” to facilitate future electrification and carbon reduction goals.
Related FAQs
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