Trade compliance answers
Specific questions, answered against the regulation or standard that governs them — test frequencies, thresholds and what has to go on the record.
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2021 IECC Blower Door Test Requirements (ACH50)
The 2021 IECC limits air leakage to 5 ACH50 in Climate Zones 0-2 and 3 ACH50 in Zones 3-8, tested to ANSI/RESNET/ICC 380, ASTM E779 or E1827. State amendments vary.
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Fire Hydrant Inspection Frequency (NFPA 25)
NFPA 25 Chapter 7 requires private hydrants to be inspected and flow-flushed annually, lubricated annually, with dry-barrel drainage checked. Details and records.
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Gas Leak After CP12 Certificate: Landlord Responsibility
Discovered a gas leak months after your landlord’s CP12 gas safety check? Learn who is legally responsible under the Gas Safety Regulations 1998.
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NFPA 14 Standpipe Hydrostatic Test: 200 PSI for 2 Hours
NFPA 14 acceptance testing requires a hydrostatic test at not less than 200 PSI (or 50 PSI above maximum working pressure) for 2 hours, measured at the low point.
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NFPA 2001 Clean Agent Hold Time: 85% for 10 Minutes
NFPA 2001 requires the enclosure to hold at least 85% of the adjusted minimum design concentration at the highest protected level for at least 10 minutes.
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NFPA 72 Voice Intelligibility: STI 0.45 / CIS 0.7 Explained
Where measured quantitatively, NFPA 72 voice systems use STI of at least 0.45 (CIS 0.7). Quantitative measurement is not mandatory - a documented listen test is acceptable.
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VGB Act Pool Drain Cover Requirements (ANSI/APSP/ICC-16)
The Virginia Graeme Baker Act requires public pool drain covers to meet ANSI/APSP/ICC-16, and single blockable main drains need a secondary anti-entrapment system.