The IECC energy code inspection verifies that the building meets the energy efficiency requirements for its climate zone. Utah’s valley communities (SLC, Sandy, Murray) are IECC Climate Zone 5: R-49 attic insulation, R-20 walls (R-13 cavity + R-5 continuous), R-30 floors over unconditioned space, and maximum 5.0 ACH50 air leakage. Mountain communities (Park City, Heber) are Zone 6 with the same insulation requirements. IECC 2021 (adopted in most Utah jurisdictions) mandates a blower door test — a whole-building air leakage test that measures air changes per hour at 50 Pa (ACH50) and identifies air sealing failures that visual inspection cannot catch. The insulation inspection must be passed before drywall can begin. RainFire Builders systematically air-seals all penetrations before insulation installation, targeting a first-attempt blower door test result well below the 5.0 ACH50 maximum.