We will have a moderated panel discussion on Enclosure and Mechanical Systems for humid climates. The panel will feature Joe Lstiburek, Lew Harriman, and Andy Äsk, and Christie Cronin. Kimberly Llewellyn will be moderating. 

Joseph Lstiburek
Ph.D., P.Eng., ASHRAE Fellow

Joseph Lstiburek is a principal of Building Science Corporation. Dr. Lstiburek’s work at BSC ranges widely, from investigating building failures to overseeing research and development projects, to writing articles and books as well as educating industry professionals. A building science pioneer, particularly in the areas of air barriers, vapor barriers, and vented and unvented assemblies, he has had a lasting impact on building codes and practices throughout the world.

Dr. Lstiburek founded BSC in 1991, and has been a key figure in establishing it as one of the
most influential and respected building science firms in North America. Dr. Lstiburek has been a licensed Professional Engineer in the Province of Ontario since 1982 and is an ASHRAE Fellow. He is an Adjunct Professor of Civil Engineering at the University of
Toronto and the past chairman of ASTM E241 - Increasing the Durability of Building Assemblies from Moisture Induced Damage. He also worked on the Canada-wide Super Energy Efficient Housing R-2000 program and served as senior engineer on commercial construction projects for Trow in Toronto.

Dr. Lstiburek is also a former Director of Research of the Housing and Urban Development Association of Canada. Dr. Lstiburek is one of the world’s foremost authorities on energy efficient construction techniques and heads one of the Building America program teams for the U.S. Department of Energy. Through the program, Dr. Lstiburek has forged partnerships with designers, builders, developers, materials suppliers and equipment manufacturers to build higher performance buildings across the U.S. Dr. Lstiburek is a noted educator who has taught hundreds of professionals over the past three decades. He has written numerous books and technical papers on building science, indoor air quality and durability, such as the best-selling Builder’s Guides and the U.S. DOE Handbook on Moisture Control. Fittingly, the Wall Street Journal has described him as "the dean of North American building science."


Lew Harriman
ASHRAE Distinguished Lecturer

Lew Harriman is Director of Research at Mason-Grant Consulting in Portsmouth, NH. He has spent 40 years researching and solving problems related to humidity and moisture in buildings and industrial processes. He is an ASHRAE Fellow and Distinguished Lecturer. Lew was the lead author and project manager for the ASHRAE Humidity Control Design Guide, and also for the ASHRAE Guide for Buildings in Hot & Humid Climates. He currently serves as Handbook Chair of ASHRAE Technical Committee 1.12 (Moisture Management in Buildings), and also as Chair of the Document Revision Committee for the ASHRAE Position Document titled: Limiting Indoor Mold and Dampness in Buildings.

Andy Ask 2018.jpg

Andy Äsk
P.E. Mech Eng.

Mr. Ask has now been practicing engineering for almost 55 years: consulting for the past 35 years, in contracting for the previous 20 years. In addition, he spent 10 years of his youth in the carpenter trade working on barns in Iowa. Major retrofit projects have included a hundred-year old hi-rise in St. Paul, MN; a railroad shop in Lincoln, NE; and several Saks Fifth Avenue stores.

The past 25 years have been devoted to solving humidity problems through the advancement and application of Building Science; and replacing HVAC components in Southwest Florida Buildings. He is now a part-time application engineering and marketing consultant to Therma-Stor in Madison, WS, with a focus on integrating whole-house dehumidifiers and residential HVAC equipment for optimum moisture removal by the combination of both products.

In addition to a number of trade journal articles and columns, Mr. Äsk is the author of H2NØ, Mechanical Systems and Moisture Control, a book written for people who are not HVAC professionals.

Christine Cronin headshot.jpg

Christine Cronin
Senior Associate, Building Science Corporation

Christine Cronin works with developers, contractors, and architects to mitigate the risk of technical failures in new construction.  Ms. Cronin’s practice includes both commercial and residential design throughout North America, including the Canadian Arctic and the Caribbean.  She reviews drawings and makes recommendations that promote appropriate water control, air control, energy efficiency, constructability, and durability.  For clients with a portfolio of upcoming projects, she assists in developing design standards commensurate with their tolerance for risk.  During the construction phase, Ms. Cronin reviews work in progress and addresses conditions or changes in sequence or scope that were not anticipated during the design phase.

In existing buildings Ms. Cronin investigates failures related to the design of the building enclosure and mechanical systems as well as material and installation defects. Failures include leaks, corrosion, rot, mold, odors, poor indoor air quality, and discomfort due to poor temperature or humidity control.  Ms. Cronin’s experience in new construction and attendant understanding of the division of labor among the trades, and typical sequencing and construction practices inform not just her analysis in forensic cases, but also her repair and retrofit recommendations, which, whenever possible, are designed to minimize disruption in occupied buildings.

Ms. Cronin has extensive experience in both the design and installation of below-grade water control systems for projects as diverse as an underground particle accelerator constructed partially underneath an existing hospital, a utility tunnel between two buildings, and a lakeside private residence with an underground basketball court. She also performs hygrothermal modeling (using WUFI), particularly of atypical building assemblies, for both new construction and to illustrate failure mechanisms in forensic cases.  

Ms. Cronin is Co-Chair and a voting member of ASHRAE Technical Committee 1.12, Moisture Management in Buildings, and a member of the Northeast Sustainable Energy Association (NESEA). 

Ms. Cronin received her Bachelor of Arts from Princeton University and her Master of Architecture from NewSchool of Architecture + Design.