What does the revised Building Code of Australia mean to Victoria's 5 Star Standard?

The updated Building Code of Australia came into effect in May 2010. Many of the updated standards will not apply in Victoria until 2011. However, 5 Star will soon become 6 Star in relation to energy efficiency. This revised Code demonstrates how building regulations are keeping pace with current trends in environmental policy.

Many builders and designers will need to review and change practices. Home builders and renovators need to prepare for the changes and ensure that their builders have an up-to-date appreciation of the requirements. It is prudent to check with your solicitor when engaging a builder and to be sure the new Standards are met.

The 5 Star Standard was introduced in 2005 in relation to new homes and extended in 2008 to cover renovated and relocated homes. It places emphasis on energy and water conservation. Compliance with the 5 Star Standard requires that all new, renovated and relocated homes in Victoria are built with a building fabric that has a 5 Star energy rating. Water saving measures and the installation of a rain water tank or a hot water service are also stipulations of the Standard.

Focus on Greenhouse Gas Emissions Reduction

Where previously the main focus of 5 Star Standard was on energy use reduction, the focus of the revised Building Code, Section J, is on the reduction of greenhouse gas emissions. This poses a range of questions for builders and designers not just about the type and use of materials but also the sourcing and transport of materials.

Roof Lighting Provisions

Previously 10 percent, the maximum provision for roof lighting has been reduced to 5 percent. In the past, the total area of roof lighting in proportion to the floor was 10 percent. In order to discourage large spans of roof lights and skylights, this provision has been amended, reducing energy loss from buildings.

Tougher regulations in relation to energy usage in air-conditioning and ventilation

There is an increase in the severity of regulations that govern air-conditioning and ventilation. The following areas reflect these changes - maximum allowable fan power; maximum pump power; water heating; air-conditioning and efficiency of refrigeration.

Glazing Stipulations

One area that has been tightened considerably is the glazing indices for buildings, type 3-9. This means that consideration needs to be given to the amount of glass used in a building, to the quality of glass, to the placement of glass and to the application of effective shade measures to protect and enhance glass capabilities. This could mean a reduction of "glass boxes" in city workplaces and a rethink for architects and designers in the building of hotels, pavilions, shopping malls and aged care facilities.

For more information and a detailed list of amendments to the BCA under Section J visit www.abca.gov.au.

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