The I-Joist model has become a favorite among builders of high-performance wall systems. A prime example includes some of  Chris Corson's Passive House work in Maine, which relies on advanced European materials for air-sealing and moisture management. These materials - namely ProClima tapes and vapor-open weather barriers - are available in the U.S. from 475, a Brooklyn-based specialty material importer and supplier.

475 recently published an e-book (a detailed PDF), "High Performance I-Joist Assemblies."  Available for free, this resource provides clear guidance and detailed drawings showing the complex origami required to marry an I-joist wall with the rest of the thermal envelope.  Learn More.

475’s first ebook, High Performance Historic Masonry Retrofits, is available as a free download.