More NCC Changes to Come
Oct 5, 2021
More NCC Changes Coming
The ABCB have recently released the proposed energy efficiency and condensation changes for the next edition of the National Construction Code (NCC) for public comment and contain proposals that will have a major impact on the residential building industry.
If approved, these changes will affect all houses and apartments, increase construction costs and require changes to many standard building materials currently used. Many house and apartment designs will need to be changed to meet NCC 2022.
The release of these proposals follows consultation in July this year on the broader NCC 2022 proposed changes which were also substantial amendments.
The proposed NCC 2022 energy efficiency changes include:
For houses (Class 1 buildings)
All new houses will need to achieve an increased building fabric requirement of 7 stars – currently the building fabric is required to achieve 6 stars.
This will result in requiring higher windows and glazing performance, with increases in the required ceiling and wall insulation R-values. In some instances a 90mm wall frame will require a wall cavity to achieve compliance in addition to the higher insulation and wall wrap requirements.
The proposals will also see the need for changes to building designs and house layouts, restrictions on wall and roof colours in various climate zones and changes to structural floor systems (either insulated slabs or sub-floor insulation in most regions).
Other major changes include:
For apartments (Class 2 buildings)
The whole apartment building will need to achieve an average of 7-stars with no apartment permitted to be less than 6-stars (under NCC 2019 this is set at 6-star average and no apartment less than 5-stars).
NCC 2019 introduced specific condensation management provisions for NCC 2022 more substantive measures are being proposed including:
changes to wall sarking requirements to more vapour permeable types equivalent to Class 3 or Class 4 membrane, depending on the climate zone, ventilating roof spaces that includes:
Exhaust system changes including:
Want to know more?
A copy of the draft NCC proposals and supporting documentation can be downloaded by visiting the ABCB website.
HIA recently ran dedicated webinars on the energy efficiency and the condensation changes providing a detailed breakdown of the changes and these can be accessed at www.hia.com.au
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