NCC 2022 Shower Floor Grading Requirements

NCC 2022, effective from May 2023, revised shower floor grading to be minimum 1:80 to maximum 1:50. This applies to all States and is irrespective of whether the waterproofing method being used is AS3740-2021 or the NCC Housing Provisions.

In Queensland, QDC MP 4.5 introduced alternatives for floor grading to other floor wastes, but this does not apply to shower areas. Showers must still comply with the min 1:80 and 1:50 as specified above.

Older approvals granted under NCC 2019 had different floor grading requirements, so it is important to verify the NCC version which applied to the project prior to installation of the waterproofing membrane and floor tiles.