IECC2021R402.4.1

Building Thermal Envelope Air Leakage

Original source

Plain-English Explanation

Section R402.4.1 covers building thermal envelope air leakage. Foundation requirements ensure your home has a stable, code-compliant base.

For the Contractor

Per IRC R402.4.1 (Building Thermal Envelope Air Leakage): verify footing dimensions, reinforcement, and depth meet local frost depth requirements.