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Webinar: 2024 IECC R405 Performance Path – What’s New, What’s Required, and How to Enforce It

January 20 @ 10:30 am - 12:00 pm

Join us for a focused training on the Simulated Building Performance Path found in Section R405 of the 2024 International Energy Conservation Code. This session explains how proposed home designs are modeled and compared to the Standard Reference Design, highlights major changes from previous code editions, and clarifies which building features can—and cannot—be traded off through performance modeling. We will cover updated HVAC and ventilation requirements, infiltration limits, renewable energy constraints, and documentation expectations for plan reviewers and inspectors. Texas-specific adoption considerations will also be discussed to help ensure consistent and effective enforcement.

Topics of Discussion:

  1. The 2024 IECC significantly tightens the performance path. The Standard Reference Design (SRD) baseline now reflects higher envelope values, higher HVAC efficiency, and updated hot water and lighting assumptions—greatly reducing the flexibility available in earlier IECC editions.
  1. Mandatory provisions cannot be modeled away. Blower door limits, duct leakage thresholds, ventilation requirements, and mechanical control provisions must be met regardless of performance modeling results.
  1. R405 is not interchangeable with the ERI path. R405 remains cost-based and depends heavily on modeling accuracy, while the ERI Path uses a scoring system. Understanding the differences is critical for both AHJs and modelers.
  1. Enforcement quality depends on documentation. R405 compliance reports, SRD comparison tables, mechanical schedules, and testing verification must be consistent with both the plans and field installation. Texas jurisdictions should standardize submittal requirements to ensure reliability.
  1. Trade-offs are more limited in 2024—especially in Texas climates. High SHGC windows, ducts in unconditioned spaces, and weak insulation levels cannot be offset solely through mechanical upgrades or PV systems under the 2024 rules.

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