Most technical provisions of the BC Fire Code describe how the code’s objectives and functional statements are achieved. However, some provisions, like this one, do not relate directly to a code objective. The following analysis is provided to assist in understanding of the provision.



Metal-framed glazed assemblies that are used as storm windows or doors, or that are required to have a fire-protection rating, and are installed to provide resistance to heat transfer in buildings to which Part 5 applies [see Sentence of Division A for application of Part 5].


To exempt certain glazed assemblies from the requirement for a thermal break stated in Sentence, on the basis that:
  • the assemblies are installed as storm windows and doors, because in this application they act as a secondary protection against heat transfer, or
  • the assemblies are required to have a fire-protection rating and it is recognized that fire is a more serious hazard than inadequate thermal performance and that rated glazed assemblies with thermal breaks are unlikely to be available.