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13.3

NT Part 13.3 External glazing

NT Part 13.3 External glazing

NT 13.3.1 Application of Part 13.3New for 2022

This Part applies to—

  1. a Class 1 building; and
  2. a Class 10a building with a conditioned space.

NT 13.3.2 External glazingNew for 2022

Compliance with this part is demonstrated with a “passed” result produced with the ABCB Glazing calculator certificate for the glazing in the building.

NT 13.3.3 ShadingNew for 2022

Where shading is required to comply with NT 13.3.2, it must—

  1. be provided by an external permanent projection, such as a verandah, balcony, fixed canopy, eaves, shading hood or carport, which—
    1. extends horizontally on both sides of the glazing for a distance not less than the projection distance P in NT Figure 13.3.3; or
    2. provide the equivalent shading to (i) with a reveal or the like; or
  2. be provided by an external shading device, such as a shutter, blind, vertical or horizontal building screen with blades, battens or slats, which—
    1. is capable of restricting at least 80% of the summer solar radiation; and
    2. if adjustable, is readily operated either manually, mechanically or electronically by the building occupants.
Insert NT figure (13.3.3) 13.3.3 as follows:
NT Figure 13.3.3: Method of measuring P and H
image-13-3-2b-method-of-measuring-p-and-h.svg
Figure Notes
  1. An external shading device that complies with NT 13.3.3(b) is considered to achieve a P/H value of 2.00.
  2. Where G exceeds 500 mm, the value of P must be halved.

Explanatory information

  • Shading devices can include fixed louvres, shading screens and other types of perforated or fixed angle slatted shades. However, such devices need to be designed for the climate and latitude to ensure that summer sun penetration is restricted, while winter sun access is achieved.
  • Gutters can only be considered as providing shading if attached to a shading projection such as a verandah, fixed canopy, eaves, shading hood, balcony or the like.
  • Shading devices can be either attached or located adjacent to the building. For example, a free-standing lattice screen may be considered to provide shading to glazing if it complies with NT 13.3.3(b)(ii).
  • An adjustable shading device should be readily operated from a safe location or platform that does not require ladders, rigging, harnessing or the like.