NT Part 13.4 Building sealing

This Part applies to—

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

The chimney or flue of an open solid-fuel burning appliance must be provided with a damper or flap that can be closed to seal the chimney or flue.

(1) A roof light must be sealed, or capable of being sealed, when serving a conditioned space.

(2) A roof light required by (1) must be constructed with—

1. an imperforate ceiling diffuser or the like installed at the ceiling or internal lining level; or
2. a weatherproof seal if it is a roof window; or
3. a shutter system readily operated either manually, mechanically or electronically by the occupant.

(1) A seal to restrict air infiltration must be fitted to each edge of an external door, openable window and other such opening when serving a conditioned space.

(2) The following need not comply with (1):

1. An external louvre door, louvre window or other such opening.
2. A window complying with the maximum air infiltration rates specified in AS 2047.

(3) A seal required by (1) may be a foam or rubber compressible strip, fibrous seal or the like.

An exhaust fan must be fitted with a sealing device such as a self-closing damper, filter or the like when serving a conditioned space.

(1) Ceilings, walls, floors and any opening such as a window frame, door frame, roof light frame or the like must be constructed to minimise air leakage in accordance with (2) when forming part of the external fabric a conditioned space.

(2) Construction required by (1) must be—

1. enclosed by internal lining systems that are close fitting at ceiling, wall and floor junctions; or
2. sealed at junctions and penetrations with—
   1. by close-fitting skirting, architraves, cornices; or
   2. expanding foam, rubber compressive strip, or caulking, or the like.

An evaporative cooler must be fitted with a self-closing damper or the like when serving a heated space.