What Must Be Waterproofed
Under AS 3740, mandatory waterproofing includes:
- Shower floors and walls: Full height on all walls within shower
- Bathroom floors: Entire floor area
- Around baths: Wall area above bath
- Hob-less showers: Extended floor waterproofing
The Standard
AS 3740-2021 specifies:
- Types of membranes acceptable
- Installation methods
- Bond breakers at junctions
- Drying times
- Testing requirements
Who Can Do It
- NSW: Licensed waterproofer required
- QLD: QBCC licensed contractor
- VIC: Registered building practitioner
- Check your state requirements
Documentation
You should receive:
- Certificate of waterproofing compliance
- Photos of membrane installation
- Product specifications used
- Warranty information