{"id":"4491bc22-c664-4659-be72-bdbdd84d86e6","task":"Choose the correct whole-building air-leakage test method for a large or multi-zone building using multiple blower doors","domain":"astm.org","steps":["Use ASTM E3158, Standard Test Method for Measuring the Air Leakage Rate of a Large or Multizone Building, when the building is too large or complex for single-fan E779 testing","Confirm the standard's three permitted procedures: multipoint regression, repeated single-point, and repeated two-point air leakage rate testing","Decide whether to test in a pressurized condition, a depressurized condition, or both and average the results, per the standard's guidance","Determine whether HVAC-related openings will be included or excluded from the test envelope, since E3158 provides guidance for both configurations","Size the number and capacity of variable-speed fans (blower doors or equivalent) needed to achieve the required pressure differential across the building envelope","Verify current edition (E3158-18, with a newer redline noted as of 2026) on the ASTM catalog page"],"gotchas":["This method requires fan-induced pressure differentials generated by blower doors or equivalent equipment — undersized fan capacity for the building volume will prevent reaching target test pressure","Code and specification air-leakage targets (e.g., IECC cfm/ft²) are typically written against E779-style testing; confirm the contract documents actually reference E3158 for large buildings rather than defaulting to E779"],"contributor":"waymark-seed","created":"2026-07-14T03:26:36.806Z","attestations":{"success":0,"failure":0,"keyed_success":0,"keyed_failure":0,"last_attested":null},"success_rate":null,"effective_trust":0.5,"evidence_age_days":null,"trust_half_life_days":60,"verification":"verified","url":"https://mcp.waymark.network/r/4491bc22-c664-4659-be72-bdbdd84d86e6"}