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3799 Main St. #87024
Atlanta, GA 30337


Advanced residential construction and home improvement consulting and owner's advocacy in Atlanta, using the latest building performance diagnostic and modeling techniques and tools. Airtightness, insulation, HVAC, ventilation, moisture, and air quality and EMF consulting for homeowners and building professionals alike.

DET Verifier

Duct & Envelope Tightness (DET) Verifier- Training and Certification
Approved by the state of georgia's department of community affairs


Georgia state energy code requires blower door and duct leakage testing on every new home. Our DET Verifier certification is recognized (along with BPI and HERS Rater Certification) to demonstrate blower door and duct tightness test competence in the state of Georgia. DET Verifiers are trained and quality-assured on an annual basis to:

  • Perform Blower Door Testing on new homes for 2009/2015 IECC

  • Perform Duct Leakage Testing on new homes for 2009/2015 IECC

  • Interpret both of these tests for Georgia Energy Code compliance

This 1-day customized course is taught by Corbett Lunsford, author of the book Home Performance Diagnostics, and based in the GA Dept. of Community Affairs curriculum. Corbett will introduce the skills necessary to become a Duct and Envelope Tightness (DET) Verifier, certify successful examinees to perform the diagnostic testing required for new homes by the 2009 or 2015 GA Energy Code. If you've been thinking about getting BPI or HERS Certified but can't yet make the investment, this DET Verifier certification can be your bridge into offering home performance testing services.

After successful completion of this course, you will be able to test the leakage of a building envelope and duct system, and evaluate the results as measured against Georgia code requirements. Specific topics include:

  • Protocols for blower door and duct leakage testing

  • Calculations for ACH50 and percent duct leakage

  • Tips for successfully completing the written and in-field DET Verifier certification exams (must pass with a 75% on both written and field exams)

This Training Includes:

  • DET Verifier Training Workbook

  • Written DET Verifier exam

  • In-field DET Verifier exam

  • Certificate of course completion


Watch the following training videos:


BPW20140101-Corbett Lunsford     773-398-5288