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BCA Section J

BCA - Guide to Building Class

If you are having any difficulty at all, please, do not hesitate to contact us. We can provide you with expert insulation advice on compliance, suitability, installation and more. Green InsulationTM offers a free engineer service to assist you to realise the ultimate performance and economy from your choice of reflective aluminium foil bubble or foam core insulation.

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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
For full details on Section J compliance refer to BCA 2010

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

Climatezone Map↓ 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.

 

 

A final note!

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