substitute
"glazing" includes frame assemblies and transparent and translucent roof lights.
"isolated glazing" means glazing in the unaltered part of a building that is thermally isolated from glazing in the altered part of the building by a barrier of—
(a) unperforated floors, ceilings or walls; and
(b) doors that are close-fitting (but not necessarily sealed).
Example—par (b)
internal French doors installed in ordinary door frames and to ordinary construction tolerances, without additional door seals or draft excluders
Note An example is part of the regulation, is not exhaustive and may extend, but does not limit, the meaning of the provision in which it appears (see Legislation Act, s 126 and s 132).