This homeowner decided to do his own waterproofing and has caused $'000's in damage to their property. This is why it is critical to get a qualified, licensed and trained waterproofer or bathroom renovator to do your waterproofing.


See how DIY waterproofing caused thousands in damage and repairs

What is waterpoofing?

So just what is waterproofing? Imagine taking a big plastic bag and filling it with water then holding it in the middle of your house. You’ll be hoping the bag doesn’t have any little holes right? If it does have any holes or even weak points, as you hold the bag, water will eventually start to leak and then go into your home.


Guess what?


That is what waterproofing a bathroom is all about & you need a plumbing professional like Nu-Trend to make sure it is done properly. It is creating a watertight membrane in the rooms of your house that will be dealing with any type of water entering or waste leaving. It protects the structure of your house from moisture. Any type of water that can escape into the floor, carpet, walls, studs, timber floor beams or building foundation can create all kinds of long term damage. Worst still, the problem may not be detected until many weeks or months down the track and sometimes is hard to locate the source depending on how or where it is coming from.


Waterproofing is the process of making an object or structure waterproof or water-resistant so that it remains relatively unaffected by water or resisting the ingress of water under specified conditions. Such items may be used in wet environments or underwater to specified depths.

Is DIY waterpoofing a good idea?

In the photos above you can see the home owner tried to save some money and do DIY waterproofing, although as you can see it wasn’t done properly. Water has been leaking into the roof and through the floor, luckily in this situation there was a car park below, but imagine if it another floor in an apartment block, the owner would be liable for damages for his property and the one below.




Waterproofing is a critical part of renovating bathrooms and is a construction step that is required to prevent water from damaging the structure of a building. For bathroom renovations it is done at different stages of a project depending on the situation. The aim is to protect from water damage caused by rain, moisture or water leaks. As we said before, water damage can result in serious issues to a building’s structure to walls, floors and more. 



You will need a qualified and licensed waterproofer to check your bathroom. While you can get a tradesperson who specialises exclusively in waterproofing, in some instances other tradespeople may be licensed or certified waterproofers too. Plumbers, for example, are often qualified waterproofers as well. Bathroom waterproofing is done before tiles are laid. In many cases, your bathroom renovator or tiler will include waterproofing in their quote. Waterproofing products are typically sheets or a water based, flexible, high performance polyurethane membrane which is painted onto a surface.


So, this is why waterproofing becomes such an important part of bathroom renovations because it must be done correctly by a qualified, licensed and trained waterproofer or bathroom renovator to do your waterproofing to make sure it is done correctly with the right approvals.

Normally it is a three step process;

1. Preparation of the surface area to ensure wall junctions are sound, without large gaps etc and ready for priming

2. Detailing is then done to where bond breaker is applied, in most cases it is a rubber or fabric wrap that helps fill gaps in the most critical areas such as corners, around fittings or drains.

3. Lastly is the membrane application which gets maybe two coats and ideally is applied at right angles to each another. It needs to be left to cure without anyone touching or walking on it before it can be tiled over

See some of our other plumbing and bathroom renovating advice

Rick Karagiannis - Plumber & Bathroom Renovator

Rick Karagiannis - Plumber & Bathroom Renovator

Rick Karagiannis is a licensed Plumber, Building Renovator and Director of Nu-Trend, a Sydney Plumber and Bathroom Renovations contractor. Nu-Trend has been operating since 2009 as an independent sole trader in Sydney. Rick provides all types of services for small bathroom renovations, leaking tap repairs, hot water high-pressure jet blasting and more.