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Waterproofing your bathroom.

The most important Part of your Bathroom Renovation in Sydney.

Waterproofing your bathroom is one of the most crucial aspects of any bathroom renovation project in Sydney. If not undertaken correctly, bad waterproofing can cause a complete loss to the entire renovation, forcing you to breakdown walls, floors and accessories to re do the job from the beginning once again.

Bathrooms are exposed to high levels of moisture and humidity, which can lead to the growth of mould and mildew and cause structural damage over time. It is for this reason that the NSW building code specifies what is acceptable, not only as a point of reference but a legal requirement for compliance.

Before work is commenced at your home, it must be undertaken by a licenced builder and a certificate for waterproofing must be obtained.

Waterproofing your bathroom., RJG Group PTY LTD

Why Waterproof Wet Areas?

Here are some reasons why waterproofing is important for your Sydney bathroom renovation.

  1. Waterproofing protects the structural integrity of your bathroom. If not completed correctly and to strict guidelines, water can seep through the walls and floors of your bathroom, causing damage to the structure over time. Waterproofing ensures that the surfaces in your bathroom are protected from water damage and that the structural integrity of your bathroom remains intact.
  2. Prevents mold and mildew growth: Moisture in your bathroom can lead to the growth of mold and mildew, which can be harmful to your health. Waterproofing your bathroom ensures that water does not seep into the walls and floors, reducing the risk of mold and mildew growth.
  3. Increases the lifespan of your bathroom: Waterproofing can extend the lifespan of your bathroom by preventing water damage and reducing the need for repairs.
  4. Compliance with building codes: In Sydney NSW, waterproofing is mandatory by law in bathrooms and wet areas. Failure to comply with building codes can result in fines and legal issues.

We can now understand why waterproofing is an essential component of building construction and renovation in Australia. It not only applies to bathrooms but also in areas of the home such as, kitchens, and balconies, which are exposed to high levels of moisture. Failure to waterproof these areas can result in costly repairs, health hazards, and legal issues.

Waterproofing your bathroom., RJG Group PTY LTD


In NSW, there are several waterproofing techniques that builders and renovators use to ensure that their projects are protected from water damage. Some of the most common techniques include:

  1. Sheet membrane waterproofing: Sheet membrane waterproofing involves the use of a thin layer of waterproof material, typically made of rubber, PVC, or bitumen, which is applied to the surface to be waterproofed. The membrane is then sealed with a waterproof adhesive, creating a barrier between the surface and any moisture. Sheet membrane waterproofing is commonly used in bathrooms, balconies, and flat roofs. It is quick to install, flexible, and durable, making it a popular choice for waterproofing projects.
  2. Liquid membrane waterproofing: Liquid membrane waterproofing involves the application of a liquid material, typically a synthetic polymer, onto the surface to be waterproofed. The liquid material forms a continuous and seamless membrane that conforms to the shape of the surface, creating a waterproof barrier. Liquid membrane waterproofing is commonly used in bathrooms, balconies, and basements. It is easy to apply, flexible, and can be used on irregular surfaces.
  3. Cementitious waterproofing: Cementitious waterproofing involves the use of cement-based coatings, typically made of a mixture of cement, sand, and additives, which are applied to the surface to be waterproofed. The coating forms a hard, durable, and waterproof layer that can withstand high levels of moisture. Cementitious waterproofing is commonly used in basement walls, foundations, and swimming pools. It is a cost-effective and durable solution for waterproofing projects.
  4. Injection grouting: Injection grouting involves the injection of a waterproof material, typically a resin or cement-based material, into cracks and voids in the surface to be waterproofed. The material fills the gaps and forms a waterproof barrier, preventing moisture from seeping through. Injection grouting is commonly used in concrete structures, such as retaining walls and basements, where cracks and voids are common. It is a highly effective technique for sealing leaks and preventing water damage.
  5. Hybrid waterproofing systems: Hybrid waterproofing systems involve the use of a combination of different waterproofing techniques to create a comprehensive and highly effective waterproofing solution. For example, a combination of sheet membrane waterproofing and liquid membrane waterproofing can be used to create a highly durable and flexible waterproofing system that can withstand high levels of moisture. Hybrid waterproofing systems are commonly used in commercial and industrial buildings, where the waterproofing requirements are more complex and demanding.

The choice of waterproofing technique will depend on factors such as the type of surface to be waterproofed, the level of moisture exposure, and the budget available. It is essential to consult with a professional waterproofing contractor to determine the most appropriate waterproofing solution for your project.

With more than 20 years in the business, RJG Group will have you covered with only the best quality waterproofing systems on the market. Our waterproofing services are applied correctly and safely with only the best quality products so you can rest assured your project will be completed with excellence.

When it comes to waterproofing, get the job done right first time. Call on the experts at RJG Group. We are always ready to take your call and provide the best advice for your project.

Be sure to consult with a professional contractor to ensure that your bathroom is properly waterproofed.

RJG GROUP PTY LTD is your innovative, trusted kitchen, laundry and bathrooms renovations and remedial company based in Greater Sydney NSW. Providing years of experience and personal service, we endeavour to finish our projects on time, budget, and exceptional quality. Give us a Call on (02) 7229 1554 for a FREE Measure and Quote.