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Blower-door and combustion-safety verification after air sealing checklist

A post-work verification checklist for confirming the building is ready for diagnostic testing, recording blower-door setup and baseline comparison, locating remaining major leakage without damaging assemblies, evaluating pressure relationships and exhaust interactions, completing qualified combustion-safety checks for affected fuel-burning equipment, confirming ventilation and makeup-air provisions, correcting unsafe or out-of-scope results, retesting after corrections and delivering an understandable report rather than treating a single leakage number as proof of comfort, moisture control or indoor-air quality.

6 items to check

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Building setup, weather, doors, dampers, drains and equipment states are documented

Critical item

Results require repeatable test conditions.

Leakage result is reported with units, building volume or area assumptions and baseline context

Critical item

A raw number without geometry or prior test is not meaningful.

Remaining major leakage paths are identified safely and linked to feasible corrections

Critical item

Testing should guide work, not encourage hazardous entry.

Bedroom, duct, garage, attic and combustion-zone pressure interactions are reviewed where relevant

Critical item

Air sealing and closed doors can alter pressure balance.

Affected combustion appliances receive qualified safety testing under required worst-case conditions

Critical item

Envelope changes should not create backdrafting or spillage risk.

Ventilation, makeup air, leakage and combustion deficiencies are corrected and retested

Critical item

Final acceptance should reflect safe completed conditions.

Use after air sealing and before final acceptance when diagnostics are part of the scope or required by a program. Do not enter unsafe attics or crawlspaces, step between framing, disturb suspect vermiculite or other hazardous materials, cover exposed electrical hazards, block combustion air or vents, seal active moisture, or work near hot flues and recessed fixtures without required clearances and qualified review. Air sealing can change building pressures and combustion behavior.

Reference standards

  • A current home energy assessment where appropriate, locally adopted building, energy, fire, mechanical and electrical requirements, approved project details, climate and moisture conditions, existing combustion equipment, hazardous-material findings, permits and inspections, utility or rebate program rules, and exact air-sealing, insulation, ventilation, firestop and equipment instructions
  • DOE and program-specific blower-door protocols, ventilation requirements and qualified combustion-safety procedures

    • Tools

  • Energy bills, plans, attic and crawlspace records, equipment data, permits, rebate requirements, photographs and material certificates
  • Camera, flashlight, tape, depth markers, ruler and owner-safe observation tools; qualified blower-door, pressure, infrared, moisture, combustion and electrical measurements where appropriate
  • Qualified energy assessor, insulation and air-sealing contractor, electrician, HVAC or combustion-safety professional, roofer and environmental specialist as needed

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