Additional ceiling insulation above the minimum requirements
The BASIX Do-It-Yourself (DIY) sets the minimum insulation requirements of ceiling. BASIX allows you to commit to a higher level of minimum insulation requirements. You can add R1.0 to the minimum requirement if your dwelling is located in NatHERS climate zones 9, 10 and 11. You can select R0.5 or R1.0 to the minimum requirement in other locations around NSW.
The higher insulation may improve heating and cooling outcomes. However, you need to make sure that the roof space or frames allow for the extra insulation material to be included without compressing it. Compression of insulation material will generally reduce its effectiveness. Alternatively, you can create the extra space needed for the additional Insulation by adding extra battens, furring channels or similar structures to the frame.
Additional insulation commitments
When additional insulation is selected in the DIY Method it must be installed. While the minimum Thermal Performance criteria can be achieved without additional insulation, the Energy score includes the benefit of this in reducing heating and cooling energy consumption.
The total R-value of insulation to be installed will be shown on the BASIX certificate and is the minimum required for code compliance plus any additional insulation nominated by the user.