Address
{{propApi.title}}
{{propApi.text}} {{region}} Change location{{propApi.title}}
{{propApi.successMessage}} {{region}} Change location Address
{{propApi.title}}
{{propApi.text}} {{region}} Change location{{propApi.title}}
{{propApi.successMessage}} {{region}} Change locationMember and guest login
Enter your email and password to access secured content, members only resources and discount prices.
Did you become a member online? If not, you will need to activate your account to login.
If you are having problems logging in, please call HIA helpdesk on 1300 650 620 during business hours.
Forgotten password
Need some help?
If you are having problems logging in, please call HIA helpdesk on 1300 650 620 during business hours.
If the email address you have entered is registered, you will receive an email with further instructions.
Become part of the HIA community
Enables quick and easy registration for future events or learning and grants access to expert advice and valuable resources.
Create a guest account
Enter your details below and create a login
Waterproofing of wet areas
The Australian Standard AS 3740 sets out the requirements for the materials, design and installation of waterproofing for domestic wet areas in residential buildings.
Friday, 28th January 2022
Overview of the Standard
AS 3740 sets out the requirements for the materials, design and installation of waterproofing for domestic wet areas for residential buildings.
What does it Include?
AS 3740 is broken into 3 sections consisting of:
- Section 1 – provides the scope and definitions applicable to this standard and the other normative reference documents that are specified
- Section 2 - sets out the acceptable waterproof and water-resistant materials to be used in waterproofing systems for walls and floors in wet areas
- Section 3 - sets out the details for the installation of waterproof and water-resistant materials to be used in shower areas, showers over baths, baths and spas, junctions, and penetrations. As well as general requirements in shower areas such as step downs, hob construction and requirements for enclosed and unenclosed showers
This standard also contains 3 informative appendices consisting of:
- Appendix A - (informative) Design consideration in wet area requirements provides information that should be considered when designing waterproofing systems for wet areas and includes guidelines for dealing with the degree of risk, and the types of materials used and their locations in the construction
- Appendix B - (informative) Falls in floor finishes outlines the primary consideration for falls in floor finishes
- Appendix C - (informative) Extent of waterproofing. The information in this appendix is based on Table F1.7 BCA Vol 1 and Table 3.8.1.1 BCA Vol 2 and provides diagrammatic representation of the extent of the waterproofing specified in the tables
Is the Standard referenced in NCC or Other legislation?
This standard is referenced in both Volume One and Two of the NCC and applies to Class 1, Class 2, and Class 4 buildings and to wet areas within other buildings with a similar level of use including sole-occupancy units within a Class 3 building.
Who is the Standard for?
This standard primary users are builders, kitchen and bathroom installers, waterproofing installers, carpenters, building designers, building certifier and surveyors, site supervisors and inspectors.
Related Australian Standards
- AS 4654 External waterproofing
- AS 1684 Residential timber-framed construction series
- AS 3958.1 Part 1: Guide to the installation of ceramic tiles
Related HIA Information Sheets
- HIA resource on AS 3958.1 Part 1: Guide to the installation of ceramic tiles
- HIA resource on AS 4654.2 External waterproofing
- HIA resource on AS 1684.2-2010 Residential timber-framed construction, Part 2: Non-cyclonic areas
- HIA resource on AS 1684.3-2010 Residential timber-framed construction, Part 3: Cyclonic areas
- HIA resource on AS/NZS 3500 Plumbing and drainage Part 1 Water services
- HIA resource on AS/NZS 3500 Plumbing and drainage Part 2 Sanitary plumbing and drainage
Getting a copy of the Standard
An electronic copy of this Australian Standard can be purchased through the Digital Australian Standards webpage.
To find out more, contact HIA's Building Services team.
Share with your network:
More articles on:
Find the latest expert advice, guides and much more!
Was this page helpful?
Thank you for submitting your feedback.
Was this page helpful?
Thank you for submitting your feedback.
Business support
Supporting building professionals with custom built services and products.
- Contracts and compliance support
- Contracts Online
- Host an apprentice
- Insurance Services
- Managing safety
- Savings for members and much more!
Waterproofing
AS 3740-2010 Waterproofing of domestic wet areas
This Standard set out minimum requirements for the materials, design and installation of waterproofing for domestic wet areas.
Non-member price $ 104
Member price $94
AS 3740:2021 Waterproofing of domestic wet areas
This Standard set out minimum requirements for the materials, design and installation of waterproofing for domestic wet areas.
Non-member price $ 204
Member price $194
AS 3958.1-2007 Ceramic tiles - Guide to the installation of ceramic tiles
This Standard provides guidance on the preparation of the background and the fixing of floor and wall tiles and mosaic tiles. It also provides information on the application of tiles in swimming pools, gradients of floors, screeds...
Non-member price $ 280
Member price $270
AS 4200.1:2017 Pliable building membranes and underlays, Part 1: Materials
This Standard sets out requirements for materials used as pliable building membranes (also known as ‘sarking’ or ‘underlay’), when used either independently or as a facing to other materials, such as insulation materials, for any ...
Non-member price $ 90
Member price $80
AS 4200.2:2017 Pliable building membranes and underlays, Part 2: Installation
This Standard sets out requirements for the installation of pliable building membranes (also known as ‘sarking’ or ‘underlay’), when used either independently or as a facing to other materials, such as insulation materials, for an...
Non-member price $ 146
Member price $136
AS 4654.1-2012 Waterproofing membranes for external above-ground use, Part 1: Materials
This Standard sets out the requirements for waterproofing membranes that are used for external aboveground applications and installed in accordance with AS 4654.2.
Non-member price $ 146
Member price $136
AS 4654.2-2012 Waterproofing membranes for external above-ground use, Part 2: Design and installation
This Standard sets out requirements for the design and installation of above-ground external waterproofing membranes for use in buildings and structures for example roofs and balconies and is also suitable for landscaped areas.
Non-member price $ 118
Member price $108