What Is AS 3740-2021?
AS 3740-2021 is the Australian Standard for waterproofing of domestic wet areas. It defines which areas must be waterproofed, the minimum membrane requirements, wall height specifications, testing protocols, and documentation requirements. Compliance is mandatory in Victoria for all new construction and major renovations.
Key Requirements for Melbourne Homeowners
Shower walls must be waterproofed to a minimum height of 1800mm. The entire bathroom floor must have a continuous membrane. Bond-breaker strips are required at all internal corners. All penetrations must be sealed. A 24-hour flood test must be performed before tiling.
Why Compliance Matters
Non-compliant waterproofing can void your home insurance, create legal liability, and lead to building defect claims. The Victorian Building Authority (VBA) requires all waterproofing work to be performed by registered building practitioners.
Ensuring Your Project Is Compliant
Use a VBA-registered waterproofer, request a written AS 3740 compliance certificate, ensure flood testing is documented, and keep all records for future property transactions. Our free matching service connects you with AS 3740 compliant waterproofers in Melbourne.