Proposed changes to commercial building energy efficiency, for instance, promise to provide cost-effective, fuel and technology neutral ways to move buildings towards net zero and support the continued uptake of electric vehicles.
“This work will help to make new commercial buildings more resilient to the impact of climate change, cheaper to operate, and aligned with net zero targets,” Grant says.
Other proposed changes include measures to reduce the incidence of building defects resulting from the ingress of water. More stringent waterproofing and water shedding provisions would deliver a significant cost benefit, the ABCB has found, including $946 million through avoided rectification work.
“The design implications are significant, as architects and engineers will be responsible for making sure gravity is used to shed water rather than relying on waterproofing membranes as we have in the past. It’s a big change to the Code.”
The ABCB is also investigating new provisions to mitigate condensation, which can lead to excessive moisture and mould growth, causing adverse health impacts and building degradation. The ABCB’s impact analysis has found a net benefit of $400 million, with the biggest benefits in tropical and cooler climates. “We are seeing a general trend away from leaky buildings, but as we seal them we need to pay closer attention to issues like condensation,” Grant adds.
“Public feedback is now being reviewed and decisions will be made in coming months. We expect the final version of NCC2025 to come into force next year, although this may change like we experienced with NCC2022.”