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Achieving 6-Star Energy Efficiency for Metal Roofing - Stramit Building Products Media Release
last updated 29/11/11
Stramit Building Products

The Building Code of Australia 2010 introduced new 6-star energy efficiency requirements for both residential and commercial buildings. As a result, the minimum R-values for insulation in walls and roofing have been increased.

Stramit Building Products has produced a free brochure that demonstrates how building designers can achieve 6-star energy efficiency using deemed-to-satisfy requirements in residential buildings with Stramit® metal roofing products, by following the three steps below. The information in the brochure applies to pitched roofing with an unventilated roof space.

Step 1: Determine your climate zone

The BCA deemed-to-satisfy energy efficiency provisions are structured around eight different climate zones. The BCA requirements vary depending on the climate characteristics of each zone. Refer to the map in the Stramit® brochure or visit the Australian Building Codes Board website (www.abcb.gov.au) and search for Energy Efficiency Climate Zone Maps.

Step 2: Select Stramit® roofing in an energy efficient roof colour

Lighter colours are more energy-efficient than darker colours because they absorb less heat from the sun. A table in the brochure shows the full colour range of COLORBOND® steel with Thermatech® solar reflectance technology. The corresponding solar absorptance values are listed in order of performance (lightest to darkest).

In climate zones 1 through 7, the minimum total R value of roof/ceiling insulation can be reduced by:

* 1.0 if a roof colour is selected with a solar absorptance less than 0.4.

* 0.5 if a roof colour is selected with a solar absorptance greater than 0.4 but less than 0.6.

Therefore, by selecting a lighter roof colour you can reduce the amount of roof and/or ceiling insulation required.

Step 3: Select appropriate insulation

For pitched metal roofing, Stramit Building Products recommends that Permastop® insulation blanket with Sisalation® foil facing be installed directly beneath the roof sheeting (draped over the roof battens) and Pink Batts® glasswool insulation laid on top of the ceiling.

The brochure includes a table of recommended combinations of roof blanket and ceiling batts to achieve the deemed-to-satisfy minimum total R-value roof requirement for 6-Star energy efficiency.

Contact your local Stramit Building Products branch for a copy of the brochure “Energy-Efficient Roofing Solutions for 6-Star Residential Buildings” and make Stramit® steel roofing part of your energy-efficient solution.

Achieving 6-Star Energy Efficiency for Metal Roofing - Stramit Building Products Media Release

Pitched Roof Insulation Configuration

1. Stramit® metal roof cladding
2. Insulation blanket (foil faced)
3. Unventilated air space
4. Ceiling batts
5. Plasterboard ceiling


Achieving 6-Star Energy Efficiency for Metal Roofing - Stramit Building Products Media Release
Download brochure - click here