Three Failures and a Save (2020 BES)

2 modules


Course Length
1 hour

Self- Paced


This presentation will review three building enclosure assemblies that met the building code yet failed in operation. The reasons for the failures will be explained, and live hygrothermal analyses will be run to show the causes of the failures. One of the projects in design development had an exterior wall assembly that met the building code yet was destined to fail. A live hygrothermal analysis will be run to show why the failure would have occurred. Changes were made to the exterior wall design so that it would not fail. These will be reviewed and a live hygrothermal analysis will be run to prove that it will not fail.

Len Anastasi, CDT, FABAA

EXO-TEC Consulting, Inc. | Avon, MA

Len Anastasi has worked in masonry, waterproofing, and restoration work for over 40 years. He is a member of ASTM’s E06 Committee on Building Performance, a member of the Boston Society of Architects’ Building Enclosure Council, and has presented at various industry conferences. Anastasi is a founding member, Fellow, past president, and past director of the Air Barrier Association of America (ABAA). He is the chair of the ABAA Conference Committee, a member of the Marketing Committee, the Technical Committee, and the Research Committee, and chairs the Ad Hoc Committee for Technical Notes. He is also a member of the Construction Specifications Institute (CSI), as well as its Northeast region president and director for its Boston Chapter.


By completing/passing this course, you will attain the certificate Certificate with IIBEC and AIA Logos

Learning Credits

Three Failures and a Save - Recording
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IIBEC Member Profile
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Added 7 months ago, by William
Added 10 months ago, by Harry
The presentation was interesting with regard to envelope failures. The presenter was good.
Added about 1 year ago, by Rebekah (Seals)
Added over 1 year ago, by Patrick
Added over 1 year ago, by Curt
Great before and after WUFI model comparisons.
Added over 1 year ago, by Alex
Added over 1 year ago, by Jason
Added almost 2 years ago, by Steven
Added over 2 years ago, by Soph
The tiered approach to failures in this presentation helps clarify and provide an avenue for keeping important elements in design for long-term value of a building.
Added over 3 years ago, by Jackie

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