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Zone Pressure Diagnostics: Precise Leak Detection and Measurement in Buildings - Self Study


Author: Rick Karg

Subjects: Renewable HVAC: HVAC Design, Green Building: Building Science

Student Rating

8.6 out of 10 (view ratings)
618 students have taken this course


Zone Pressure Diagnostics (ZPD) is one of the most powerful tools available for building analysis.

The free calculation aid from Residential Energy Dynamics (RED) is the most accurate and easy to use ZPD tool available. This course addresses the ZPD basics to the advanced features. Learn about non-modifiable and modifiable zone analysis, the use of your digital manometer for ZPD testing, and the meaning of your results.

This course includes the latest ZPD methods and includes the most significant articles written about this building science technique. The two-part video presentation, narrated by the instructor, addresses all the ZPD principles and details, including the use of the RED ZPD tool.

Learning Objectives:
• List reasons for performing ZPD in the field, both modifiable and non-modifiable analysis
• List the tools needed to perform ZPD
• Explain how to conduct a modifiable ZPD test to an attic, attached garage, or basement
• Discuss the results of modifiable zone analysis, including flow at CFM50 and area of leakage in each pressure boundary
• Understand ZPD targets used by weatherization programs
• Describe how additional attic venting can increase the whole-house CFM50 value
• Calculate the effective area of attic venting using ZPD, not your tape measure
• Identify when the pressure and thermal boundaries in a house are aligned
• Know the disadvantages of non-modifiable zone analysis
• Determine when air sealing work has been effective
• Understand how to use ZPD for Quality Control Inspections

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Flexible Online Training for Industry Professionals

This is a self-study, self-paced online course. You can begin instantly upon enrollment and complete the course materials at your own pace.

Access Information and Build Your Training Library

After enrolling, the course materials will remain in your account and be accessible 12 months (1 year) after enrollment. Access can be extended beyond 1 year with a monthly membership. Rewatch videos and review assignments as many times as you want. View updates the instructor makes to the course as the industry advances. Return to your course anytime with online access from anywhere in the world.

Certificates of Completion Available for Members Only

Certificates of completion are only provided to HeatSpring Membership subscribers. This course has not been approved by any credentialing organizations (NABCEP, AIA, USGBC etc) for Continuing Education Credits (CEUs). This course is for self education purposes only and completion does not indicate a level of professional expertise or credential.


Rick Karg

President, Residential Energy Dynamics

Rick spent ten years building houses, taught college economics, helped design one of the first energy modeling programs, managed the Maine Home Performance Program, and has been training utility staff, low-income weatherization personnel, and private energy auditors and contractors for over three decades. He has been a member of the ASHRAE 62.2 ventilation committee...[more]

Course Outline

Zone Pressure Diagnostics: Precise Leak Detection and Measurement in Buildings

  • User-Friendly Pressure Diagnostics. Jim Fitzgerald, Rob Nevitt, and Michael Blasnik. Home Energy magazine, September/October 1994. (Download .pdf)
  • Zone Pressure Diagnostics: A new protocol shows how to make a valuable diagnostic test even more useful. Dave Bohac. Home Energy magazine, May 2002. (Resource)
  • Zone Pressure Diagnostics, Part 1 of 2 (Video - 37:08 minutes)
  • Zone Pressure Diagnostics, Part 2 of 2 (Video - 49:46 minutes)
  • The Benefits of Zone Pressure Diagnostics (Resource)
  • An Investigation into Zone Pressure Diagnostic Protocols for Low Income Weatherization Crews. Report 208-1. December 2001. Energy Center of Wisconsin. (Resource)
  • Final Quiz (10 questions) (Quiz)

Students who took this course also took

ASHRAE 62.2 Ventilation for Single-Family Dwellings

Instructor Rick Karg is has been a member of the ASHRAE 62.2 ventilation committee since 2007 and heads the existing dwellings group. He served as the lead editor of ASHRAE’s Guideline 24-2015, a document that supplements the ASHRAE 62.2 standard.