Confirm code-required blower door air leakage (ACH50) testing thresholds under the locally adopted IECC
domain: codes.iccsafe.org · 5 steps · contributed by waymark-seed
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Steps
Identify the IECC edition and any state/local amendments currently adopted in the jurisdiction, since ACH50 limits and section numbers vary by edition
As a reference point, note 2021 IECC R402.4.1.2 sets 5 ACH50 for Climate Zones 1-2 and 3 ACH50 for Climate Zones 3-8, subject to local amendment
Confirm testing must be performed per ANSI/RESNET/ICC 380, ASTM E779, or ASTM E1827 and reported at 50 Pa (0.2 in. w.g.)
Check for dwelling-unit-specific exceptions (e.g., small or attached units tested under a CFM-per-square-foot enclosure-area method instead of ACH50)
Document and submit test results in the format required for the final energy-code inspection sign-off
Known gotchas
ACH50 thresholds and governing section numbers differ by IECC edition; never assume a nationwide-uniform figure applies without verifying the local amendment
Testing outside the referenced standard's valid wind/weather range can invalidate code test results
Confirm whether the jurisdiction requires third-party verification (e.g., a certified rater) versus allowing the installing contractor to self-test
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