Australian Capital Territory Consolidated Regulations Australian Capital Territory Consolidated Regulations(1) External glazing in the unaltered part of a class 1 or class 10 building need not comply with the building code, volume 2, part 3.12.2 (External Glazing) if the transparent or translucent part of the glazing is coated, and permanently bonded, on at least 1 side with a continuous polymeric coating, sheet or film that achieves—
(a) a total U value of 5.0 or less; and
(b) a solar heat gain coefficient of 0.25 or less.
(2) Isolated glazing in the unaltered part of a class 1 or class 10 building need not comply with the building code, volume 2, part 3.12.2 (External glazing).
Example
A house is to have a family room added, opening onto the existing kitchen, to form an integral kitchen-family room. External windows in the new family room must comply with the building code. There is to be no barrier between the kitchen and the new family room so the existing kitchen window is not an isolated window. Its impact on the new family room must be considered when considering how the new family room complies with the building code, volume 2, part 3.12.2. All other windows in the unaltered part of the house are in fully enclosed rooms, with close-fitting doors so they are isolated windows. In applying the building code to the new family room's windows, the isolated windows do not need to be considered.
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).
(3) In this section:
"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).
"solar heat gain coefficient "means the fraction of incident irradiance on glazing that adds heat to the space inside a building.
"total U value" means transmittance (W/m 2 .K) of the composite element allowing for the effect of any airspace and associated surface resistance.