Part 2 applies to naturally ventilated buildings which are occupied and require certain areas to be heated or cooled. Passive building design is encouraged and wherever possible, the efficient use of renewable energy is stipulated.
The standard is written according to how one would actually construct a building.
- Site and siting (Orientation & shading)
- Building design (Foundation, floor,
walls, fenestration, ceiling & roof)
- Building sealing (Envelope, air filtration & leakage)
- Services (Lighting, power, hot water leakage & appliances)
This section stipulates the total R-value that must be achieved by the construction of the foundations, floors, walls, roofing system and services.
Floors and solutions
- Perimeter insulation R-value = 1.0
- Exception1: buildings greater than 500 m2
- Exception 2: Climatic Zone 5
- In-slab heating – insulated with R-value = 1.0
- Water resistant
- Continuous
- Perimeter insulation – suspended floor
- Climatic Zones 1 & 2 – R-value = 1.5
- Climatic Zones 3, 4 & 6 – R-value = 1.0
- In-slab heating – R-value = 1.0
Walls – density less than 300 kg/m2
- Climatic Zones 1 & 6 Total R-value = 2.2
- Climatic Zones 2, 3, 4 & 5 Total R-value = 1.9
Walls – density greater than 300 kg/m2
External walls greater than 300 kg/m2 & internal walls of solid masonry greater than 150 kg/m2
Roofing System
Hot Water Services
All hot water services shall be insulated in accordance with the information in the table above
Insulation shall:
a) be protected against the effects of weather and sunlight,
b) be able to withstand the temperatures within the piping
All chilled water, hot water and refrigeration piping, conditioned air duct work and flexible ducting shall be insulated to limit heat gain/loss to not more than 5% from source to furthest point of delivery on a system.
Picture courtesy of Liewellyn van Wyk Senior Researcher for CSIR