The use of foam insulation as part of building enclosures has received increased scrutiny in recent years and numerous envelope assemblies have been successfully tested to CAN/ULC S134 or its US counterpart NFPA 285. However, most of these assembly-specific tests have been performed on stud wall assemblies.  This presentation outlines the results of testing spray foam insulation inboard of a unitized glazing system and demonstrates that these assemblies can also meet the requirements of these standards.