The Importance of Waterproofing

Waterproofing is an essential step in your construction process. It ensures the longevity of your home by reducing the possibility of structural damage to your home

According to AS3740 of 2010, all wet rooms require waterproofing – this includes any bathrooms/en-suites, laundries and water closets. The physical elements that are covered by this legislation include’s floors, walls, junctions and penetrations, with specific emphasis on showers, areas adjacent to baths and spas, general wet areas and areas adjoining other vessels such as sinks, basins or tubs.

Waterproofing these areas, especially in the bathroom, is critical to the eliminating any possible damage to the structural integrity of your home.

The smallest amount of water over time can be costly so investing in this procedure in the initial build is essential.

How to waterproof

Waterproofing is one of the first steps to take place when a bathroom is being built. It involves installing a waterproof barrier around the walls and floor in your bathroom to protect the structure of the house from the moisture.

To become a qualified waterproofing contractor, a tradesperson must be properly trained in how to apply waterproofing materials according to the Australian standard. In most cases, this will involve doing a Certificate III training course in waterproofing. Therefore, it is worth confirming that your contractor has the necessary qualification and licenses before they begin. 

Like all works, preparation is king.

Your contractor will need to undercut door jambs and skirting above the finished tile line. The surfaces will need to be cleaned down, including the cement sheet or concrete flooring to allow for correct adhesion of the undercoat.

The first stage, they will apply the first coat of membrane to the shower step-down under the screen and on the shower walls. They will tape the corners and around penetrations for strength and flexibility. Also waterproofing under the vanity area.

The screen is a sand and cement mix which is applied to the shower base to create fall to the waste. Once this is dry, then a second layer of membrane to the base on the walls.

Once the vanities have been installed and ceilings and walls have been painted, the waterproofer should return to apply a final coat. This should be done just before the Tiler commencers, to avoid damage to the waterproof membrane. At this point, water bars are installed to the shower, doorways and under bath lips.

A water bar is an aluminium trim that is waterproofed in place as a solid block for water to not get past this area

The importance of waterproofing cannot be underestimated. The team of Ramsay Builders contractors possess the correct qualifications to ensure your wet rooms remain dry for decades to come.


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