Wet-area waterproofing: new house

Waterproofing · New house National only

Guidance only. This checklist explains requirements in our own words and cites the clause to check; it does not reproduce the NCC or any third-party standard. Always confirm against the current NCC, the relevant standards, the approved plans and manufacturer instructions. It does not replace a registered building surveyor, certifier or inspector.

Pre start

Wet areas identified on plans (shower bath laundry WC) with waterproofing extent shown

Check: Housing Provisions 10.2.1 · NCC 2025 Housing Provisions
Evidence: Photo of plan markup

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Substrate

Floor falls to waste are correct with no ponding

Check: Housing Provisions 10.2.12 (falls); AS 3740-1994
Older edition Cited from AS 3740-1994; NCC 2025 references AS 3740-2021 (Waterproofing of domestic wet areas). · NCC 2025 Housing Provisions
Evidence: Photo with level or water test

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Membrane

Floor-wall junctions bond-breakers or flashing fillets installed

Check: AS 3740-1994
Older edition Cited from AS 3740-1994; NCC 2025 references AS 3740-2021 (Waterproofing of domestic wet areas). · AS 3740 - Waterproofing of wet areas within residential buildings
Evidence: Photo before membrane

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Waterproofing extends to required height on shower walls and outside the shower area

Check: Housing Provisions 10.2.2-10.2.5; AS 3740-1994
Older edition Cited from AS 3740-1994; NCC 2025 references AS 3740-2021 (Waterproofing of domestic wet areas). · NCC 2025 Housing Provisions
Evidence: Photo with tape measure

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Puddle flanges or waste outlets sealed into membrane

Check: AS 3740-1994
Older edition Cited from AS 3740-1994; NCC 2025 references AS 3740-2021 (Waterproofing of domestic wet areas). · AS 3740 - Waterproofing of wet areas within residential buildings
Evidence: Photo

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Penetrations (taps mixers shower roses) sealed

Check: AS 3740-1994
Older edition Cited from AS 3740-1994; NCC 2025 references AS 3740-2021 (Waterproofing of domestic wet areas). · AS 3740 - Waterproofing of wet areas within residential buildings
Evidence: Photo

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Tiling

Membrane not damaged before or during tiling

Check: AS 3740-1994
Older edition Cited from AS 3740-1994; NCC 2025 references AS 3740-2021 (Waterproofing of domestic wet areas). · AS 3740 - Waterproofing of wet areas within residential buildings
Evidence: Photo

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Practical completion

Shower screen and fixtures sealed; no cracked grout or drummy tiles

Check: State or territory guide to standards and tolerances · State or territory guide to standards and tolerances
Evidence: Photo

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Water test of shower: water drains to waste and does not escape the shower area

Check: Housing Provisions 10.2.2, 10.2.12 · NCC 2025 Housing Provisions
Evidence: Video or photo

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13 more items on this checklist come with a higher plan. Compare plans