Bathroom Waterproofing

Bathroom Waterproofing


The bathroom is one of the wettest areas of the home. Thus, it’s important to make sure that no moisture escapes from it to other parts of the home. This is done through waterproofing, which involves the application of a suitable barrier to make sure that water doesn’t escape the wet areas of a building. 

Homeowners typically waterproof their bathrooms during construction or renovations. The waterproofing should be done correctly, otherwise, moisture penetration may cause serious structural damages to your structures and home. As such, you need to hire a qualified and experienced waterproofing contractor to take care of your Sunshine Coast bathroom; like Queensland Interior Linings.

bathroom waterproofing

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When you choose to book a commercial plastering service with the Queensland Interior
Linings team, you’ll enjoy the highest-quality work, guaranteed. Your complete satisfaction is of
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Australian standards for bathroom waterproofing


In Australia, regulations vary from state to state. But as a general rule, the Building Code of Australia (BCA) and the Australian Standards (AS 3740-1994) lay out the following minimum standards;

  • The entire shower floor must be waterproofed. On the other hand, shower walls must be waterproofed to a minimum height of 1800mm.
  • Bathroom walls must be waterproofed to a height of at least 150 mm.
  • If the bathroom floor is made of/contains wood, the entire floor must be waterproofed. The same applies if the bathroom is on the second story or higher.
  • The step-down or hob from the shower to the floor must be waterproofed up to a height of 100 mm.

All residential homes in the country must comply with the above regulations. 

How do you waterproof a bathroom?


Bathroom waterproofing is usually done in stages. There are different ways to go about it, and your contractor will pick the most appropriate method depending on your situation.

Generally though, the wall and floor surfaces of your bathroom must first be cleaned and primed for waterproofing. This is done using a broom and dustpan to remove dust and other particles. The contractor will also smoothen any uneven sections of the floor and wall and dry out any water in the bathroom space.

The primer is then applied on the entire floor and 150 mm up the walls and allowed to dry. Silicon may also be applied to close any gaps and cracks and allowed to dry over 24 hours. The waterproofing agent and membrane will later be applied up to the required height and also left to dry for 24 hours. 

Finally, a second coat of waterproofing membrane is applied to the entire area. Once it drys up, your bathroom is waterproofed.

bathroom waterproofing
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Bathroom waterproofing Sunshine Coast


Do you live on the Sunshine Coast, Gold Coast, Brisbane, Townsville, and Byron Bay? Well, consider your bathroom waterproofing needs covered by the best contractor in town; Queensland Interior Linings. We are an experienced, well-trained, and versatile team of ten tradesmen and five apprentices, boasting of the best plastering, painting, and waterproofing work in the Sunshine Coast Area.

Call us today to book a bathroom waterproofing service or receive a free quote for your upcoming project.

Frequently Asked Questions

How much does it cost to waterproof your bathroom?

The costs of bathroom waterproofing vary depending on your location and the size of your bathroom. It may also be determined by whether your bathroom is a wet room or an enclosed shower with concealed section, which requires less application.

Call us today to get a quote on the cost of waterproofing your Sunshine Coast, Gold Coast or Brisbane

How do I know my bathroom has bad waterproofing?

A poorly waterproofed bathroom poses a big risk to the structural integrity of your home. As such bad waterproofing needs to be detected and fixed as early as possible. Watch out for the following signs;
●       The tiles squelch or move when you stand on them.
●       Timber studs and structures around your bathroom may start attracting termites due to water damage.
There is water seepage around the floor and walls of your bathroom

Can I DIY my bathroom waterproofing?

While some localities may allow homeowners to waterproof their bathrooms DIY style, it’s always better to let a licensed specialist do it. This ensures that your bathroom meets the minimum Australia waterproofing standards as laid out in AS 3740.

Get a quote today


Do you need a reliable plastering or painting? We have a sister company that can do all interior linings and painting.
Get in touch with us today to get a free quote or discuss an upcoming project we might be able to help with.