BCA Section J
BCA - Guide to Building Class
| Commercial | |
| Building Class | Example |
| Class 2* | Multi-res, units, apartments |
| Class 3 | Boarding houses, backpackers |
| Class 4* | Dwelling parts of aged care facilities |
| Class 5 | Office buildings, front offices of factories or warehouses |
| Class 6 | Showrooms, restaurants |
| Class 7 | Carparks, storage warehouses |
| Class 8 | Laboratories, workshops |
| Class 9a | Hospitals |
| Class 9b | Workshops/labs in schools |
| Class 9c | Aged care buildings |
| *In BCA 2010 Building Classes 2 and 4 are required to comply with energy rating requirements under Section J rather than the Deemed-to-Satisfy (DTS) method. Please refer to Volume 1 p.612. | |
| Residential | |
| Building Class | Example |
| Class 1 | Detached house, town house, villa unit |
| Class 10 | Private garage, carport |
BCA Commercial Class 2, 3, 4, 5, 6, 7, 8, 9a, 9b, 9c Mimimum R-value guide
| Class 2-9 | Climate Zones | |||||||
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | |
| Direction of heat flow | Inwards | Outwards | ||||||
| Roofs | Rτ3.2 | Rτ3.2 | Rτ3.2 | Rτ3.2 | Rτ3.2 | Rτ3.2 | Rτ3.7 | Rτ4.8 |
| Walls | Rτ3.3 | Rτ3.3 | Rτ3.3 | Rτ2.8 | Rτ2.8 | Rτ2.8 | Rτ2.8 | Rτ3.8 |
| Suspended Floors (Unenclosed) | Rτ2.0 | Rτ2.0 | Rτ2.0 | Rτ2.0 | Rτ2.0 | Rτ2.0 | Rτ2.0 | Rτ3.5 |
| Light coloured roof, solar absorptance ≤ 0.50 | ||||||||
BCA Residential Class 1 and 10 Mimimum R-value guide
| Class 1&10 | Climate Zones | |||||||
| 1 | 2 |
3 | 4 | 5 | 6 | 7 | 8 | |
| Direction of heat flow | Inwards | In & Out |
Outwards | |||||
| Roofs | Rτ4.1 | Rτ4.1 | Rτ4.1 | Rτ4.1 | Rτ4.1 | Rτ4.1 | Rτ4.1 | Rτ6.3 |
| Walls | Rτ2.8 | Rτ2.8 | Rτ2.8 | Rτ2.8 | Rτ2.8 | Rτ2.8 | Rτ2.8 | Rτ3.8 |
| Suspended Floors (Unenclosed) | Rτ1.5 | Rτ1.0 | Rτ1.5 | Rτ2.25 | Rτ1.0 | Rτ2.25 | Rτ2.75 | Rτ3.25 |
| Light coloured roof, solar absorptance ≤ 0.40 | ||||||||
Solar Absorptance for COLORBOND® Colours
Table 1 - Colour Classification in Accordance with the BCA
Colour |
Solar Absorptance |
Colour |
Solar Absorptance |
|---|---|---|---|
| Classic Cream™ | 0.31 | Headland® | 0.632 |
| Surfmist® | 0.318 | Wilderness® | 0.651 |
| Paperbark® | 0.421 | Jasper® | 0.682 |
| Evening Haze® | 0.427 | Manor Red® | 0.688 |
| Shale Grey™ | 0.433 | Woodland Grey® | 0.706 |
| Sandbank® | 0.455 | Loft® | 0.711 |
| Dune® | 0.466 | Monument® | 0.732 |
| Windspray® | 0.584 | Ironstone® | 0.743 |
| Pale Eucalypt® | 0.597 | Cottage Green® | 0.746 |
| Bushland® | 0.619 | Deep Ocean® | 0.749 |
For full details on solar absorptance refer to the COLORBOND® website
↓ Downloads
315 Climate Zone Map - Australia BCA 2009
315 Climate Zone Map - NSW BCA 2009
315 Climate Zone Map - NT BCA 2009
315 Climate Zone Map - Qld BCA 2009
315 Climate Zone Map - SA BCA 2009
315 Climate Zone Map - Tas BCA 2009
315 Climate Zone Map - Vic BCA 2009
315 Climate Zone Map - WA BCA 2009
Note: This tool is an interpretation of BCA 2010 (Vol. 1 Section J and Vol. 2 Part 3.12) and is a guide only. Final designs should always be checked against the BCA for compliance.
Green Insulation Pty Ltd accepts no responsibility or liability for parties acting solely on the basis of information presented in this guide.
