Intent 1:
To exempt certain glazed assemblies from the requirement
for a thermal break stated in Sentence 5.9.2.4.(2), 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.