Quantifying air sealing results helps validate improvement effectiveness and guide additional efforts. While professional blower door testing provides precise measurements, DIY methods can indicate significant improvements and identify remaining problem areas.
DIY Assessment Methods
Utility Bill Analysis:
Compare energy usage before and after air sealing using degree-day normalization to account for weather variations. Significant air sealing should show 10-30% reductions in heating and cooling energy use.
Calculation Method:
Monthly Usage per Degree Day = Monthly kWh or Therms ÷ Monthly Degree Days
Compare ratios before and after improvements to isolate air sealing impact from weather variations.
Comfort Observations:
Document comfort improvements that indicate successful air sealing:
- Reduced drafts in previously problematic areas
- More uniform temperatures between rooms
- Less frequent HVAC system cycling
- Improved humidity control during extreme weather
Smoke Testing Results:
Repeat smoke testing after sealing to verify elimination of air movement at previously leaky locations. Focus on the largest air leakage sites identified during initial assessment.
Professional Verification
Blower Door Testing:
Professional before-and-after blower door testing provides precise quantification of air sealing success. Typical results show 20-50% reductions in air leakage rates after comprehensive DIY air sealing efforts.
Thermal Imaging:
Professional thermal imaging after air sealing can identify remaining air leakage sites missed during DIY efforts. This information guides additional sealing work for maximum effectiveness.
Duct Blaster Testing:
If ductwork is located in unconditioned spaces, professional duct leakage testing quantifies both building envelope and duct system air leakage improvements.
Long-Term Performance Monitoring
Annual Assessments:
Conduct annual visual inspections of sealed areas to identify any deterioration or failure of sealing materials. Address problems promptly to maintain performance.
Seasonal Observations:
Monitor home performance during extreme weather when air leakage problems are most apparent. Note any return of draft problems or comfort issues requiring attention.
Maintenance Requirements:
Plan maintenance schedules for different sealing materials:
- Caulk: 5-10 year replacement cycle depending on exposure
- Weatherstripping: 3-7 year replacement depending on use and quality
- Expanding foam: Generally permanent but may require touch-ups
- Gaskets: 10-15 year replacement for high-quality materials