This week on IAQ Radio we welcome Henri Fennell is a building envelope specialist and architect with over forty years of experience in energy conservation design, products, and services. His background covers many disciplines providing a unique perspective on the real-world design and implementation of high-performance building envelopes. Mr. Fennell’s work with polyurethane foam materials began with energy-efficient demonstration projects during the energy crisis of the 1970’s, including the Pittsburgh Children’s Museum, his first spray foam project, in 1971. Mr. Fennell’s work experience has included positions as a practicing architect, a building envelope contractor, and a building envelope remediation and commissioning consultant. Mr. Fennell’s contracting work has included thousands of remediation, building failure, and historic renovation projects, including major projects like the Guggenheim Museum and numerous other high-profile and historic buildings. His projects have included the installation of millions of pounds of polyurethane foam. This work included the development of on-site techniques and delivery systems that made closed-cell injected polyurethane (IPF) foam insulation/sealants available to the general construction industry. Mr. Fennell has authored or co-authored four energy-related U.S. patents and participated in the development of ASTM standards and other industry protocols. He has been an energy educator since 1975, making presentations and providing training to a broad range of industry audiences. He has contributed to ASHRAE Journal and other national publications and is often cited in articles related to energy conservation, materials technology, and building performance. He currently works as a consultant on spray foam projects and is commonly called on to help determine what to do when foam jobs go bad.