Commercial – Section J


Commercial Section J Commercial Energy efficiency or Section J Compliance can be handled quickly and cost effectively by Sustainability WA. To assist in conformance here is a general overview of the BCA Section J requirements.

Please note that the R Values indicated below are for System R Values, meaning this is the minimum R Value required combine your building materials with the insulation.

When Sustainability WA carries out a Section J, Commercial energy efficiency Report these values are all calculated for you to ensure you know exactly what your project will require.

Specific requirements

Roof and Ceiling Insulation

Roof and ceiling insulation varies in Zones 1, 2 and 3 dependent on the colour of the roof.

Total R Value Required:

Zones 1, 2, 3: R3.2 – R4.2

Zones 4, 5, 6: R3.2

Zone 8: R4.8

Note: Ceiling insulation needs to be increased to compensate for areas of exhaust fans, flues or recessed downlights if this area is more than 0.5% of the total insulation area.

Roof Lights – Roof Lights servicing conditioned areas need to meet minimum criteria dependent on area of roof lights. Contact us for more information

Wall Insulation

BCA Total R Value requirement:

Zones 1, 2 and 3: R3.3

Zones 4, 5 and 6: R2.8

Zone 8: R3.8

Concessions are available for the above R values and can be reduced for the following reasons:

The wall has a surface density greater than 220kg/m²
The wall faces South
The wall has shading as per the minimums described in the BCA
The wall is a light colour (for zones 1,2 and 3 only)

Sustainability WA ensures your project always receives the appropriate reductions which can significantly affect the profitability

Internal Walls – Walls between conditions and non-conditioned require insulation with a total R Value of up to R 2.3

Suspended Floors

Suspended floor requires a total R value of 2.0

Where the subfloor is enclosed and mechanically ventilated, this can be reduced to R 1.25

Glazing Calculator – A Glazing calculator needs to be completed. Talk to sustainability WA about what this involves.

Air conditioning and Lighting – Air conditioning needs to be designed according to the BCA. The designer is required to sign a declaration to show compliance.

There are minimum wattage levels for commercial building which depend on the size and use of the area. Sustainability WA complete all lighting calculations as part of our process.

Sustainability WA makes energy efficiency easy. Certification is simple for both Residential and Commercial projects.

Call or email Sustainability WA now for a no obligation consultation to find out how we can assist your commercial energy efficiency Certification easy. We can make a time to come to your office and show you how our services and extensive knowledge of the energy efficiency guidelines can make your life easier.

Sustainability WA specializes in cost effective, efficient energy ratings for builders, architects and drafts people and providing advice on the new Energy Efficiency regulations.

For more info, CONTACT US or call us at 08 9537 2000

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