What are the specific NCC 2022 requirements for fire separation in attached residential dwellings in Australian bushfire-prone areas?

The NCC 2022 mandates enhanced fire separation for attached residential dwellings in bushfire-prone areas, primarily through Specification C1.10 and specific C1 provisions. This typically requires fire-resisting construction for external walls and other building elements depending on the Bushfire Attack Level (BAL). Walls shared between dwellings must achieve appropriate Fire Resistance Levels (FRLs), often using non-combustible materials like masonry or specific plasterboard systems, extending to the underside of the roof covering or higher where a roof space exists. Openings must also be protected to prevent fire spread, aligning with AS 3959 requirements.