Model energy efficiency codes (ASHRAE 90.1 & Internation Energy Efficiency Code (IECC)) are under continuous maintenance and publish an updated edition every three years. The energy code, however, does not become a regulation until it is adopted by a state or jurisdiction. Therefore the timeline for updating varies by individual jurisdiction. Further, the adopted code must than be enforced by local authorities. This presentation will discuss the development of air leakage requirements in the model energy codes for commercial buildings. It will then describe the status of adoption of model codes by the states. Finally, the implications for enforcement through whole building airtightness testing of the adopted code will be discussed.

LEARNING OBJECTIVES

1. Understand how code regulations for air leakage control have evolved in the model codes (ASHRAE 90.1 & IECC).
2. Understand the status of state adoption of model codes.
3. Understand through examples, how air leakage control regulations are specific to climate zones and, therefore, to state requirements.
4. Understand required air barrier verification included in code enforcement, including when whole building air barrier airtightness testing and/or dwelling unit testing is required.

Dr. Theresa A. Weston

President, The Holt Weston Consultancy

Dr. Theresa Weston is a building science research professional specializing in the durability and energy efficiency of buildings. Theresa started The Holt Weston Consultancy in November 2020 to foster innovation of building materials, and products to improve the resilience and sustainability of buildings. Prior to starting the Holt Weston Consultancy, Dr Weston was a DuPont Laureate with the Dupont Safety and Construction business, having worked for DuPont for 35 years. Dr. Weston is active with industry standard and code development activities, including with ICC, ASHRAE and ASTM. Currently, Theresa represents ABAA and RAiNA in code advocacy activities. Additionally, Dr. Weston is a prolific author and industry speaker. Recent activities include chairing an ASTM Symposium and resulting special technical publication on Whole Building Air Leakage: Testing and Building Performance Impacts (STP1615) as well as presentations as an ASHRAE Distinguished Lecturer. She is the Vice-Chair of the ASHRAE sponsored Buildings Conference Series