Section J tips

1. Identify which spaces may be, or will be, mechanically heated or cooled.

2. Identify existing wall types. Identify proposed wall types as either :

  • fully masonry pre-cast panel/blockwork/brick or
  • lightweight.

If masonry identify if insulation is to be polystyrene foam board and battens or contained in a stud wall.
If lightweight identify if your preference is for battens fixed to studs or cladding directly fixed to studs.

3. Identify where roof/ceiling insulation is proposed to be located ie across rafters/purlins as is usual in non domestic style construction, between the rafters, or on the ceiling as is common in domestic type construction.

Confirm if a suspended ceiling is proposed.

Also confirm if lighting is proposed as ceiling mounted or recessed.

4. In climate zone 6 (Melbourne) – generally:

  • All new non residential roofs should achieve a total R value of 3.2 measured for heat ingress.
  • All external building envelope walls should generally achieve a total R value of 2.8 (some exemptions exist).
  • Internal envelope walls are required to achieve R1.0 or R1.8 depending on different conditions.

5. Skylights – should be no greater in area than 5% of the floor area of the room they serve (limited exemptions exist).

6. Glazing – large areas of unprotected glazing may have difficulty complying. In order to reduce the need for expensive glazing solutions or re-design, we recommend undertaking the glazing assessment in the early design phase rather than just prior to seeking the building permit.

7. Lighting – a  lighting plan indicating proposed lamp wattages and whether or not fittings are recessed or ceiling mounted will be required to show compliance – but can be completed after the Section J report.