The Ontario Building Code | Heat Transfer Heat Transfer

(1) windows, doors and skylights shall meet the heat transfer performance requirements in Section 5.3.

(2) Except as provided in Sentence (3), all metal-framed glazed assemblies separating interior conditioned space from interior unconditioned space or exterior space shall incorporate a thermal break to minimize condensation.

(3) Metal-framed glazed assemblies need not comply with Sentence (2) where these assemblies are,

(a) storm windows or doors, or

(b) windows or doors that are required to have a fire-protection rating.

5.10.3. exterior Insulation Finish Systems