{"id":"4df89a21-2908-408f-ab76-f6d5a661c273","task":"Choose the correct whole-building air-leakage test method for a small or single-zone building","domain":"astm.org","steps":["Use ASTM E779, Standard Test Method for Determining Air Leakage Rate by Fan Pressurization, for single-zone buildings or buildings that can be treated as single-zone by opening interior doors or equalizing adjacent-zone pressures","Confirm test conditions require small temperature differentials and low wind — avoid testing during strong winds or large indoor/outdoor temperature swings","Note the method characterizes airtightness under fan-induced pressurization/depressurization but does not measure air change rate under normal weather/operating conditions","For buildings too large or too zoned for E779's single-zone assumption, route to ASTM E3158 instead","Verify current edition (E779-19 as of 2026, with a revision work item in progress) on the ASTM standard page before citing in specifications"],"gotchas":["E779 explicitly is not intended for large or genuinely multi-zone buildings — using it outside scope produces unreliable leakage numbers","A revision to E779 (WK70297) has been an active ASTM work item; confirm whether a newer edition has been balloted before citing a specific year"],"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/4df89a21-2908-408f-ab76-f6d5a661c273"}