The Importance of Proper Waterproofing in Victoria, Australia

Why Waterproofing Matters

Waterproofing is one of the most crucial steps in any bathroom, kitchen, or wet area renovation. It acts as the first line of defense against water damage, preventing leaks, mold growth, and structural damage. Despite its importance, many builders and tilers in Victoria cut corners to save costs, leading to significant issues down the road.

Victorian Standards for Waterproofing

In Victoria, waterproofing must comply with the National Construction Code (NCC) and Australian Standard AS 3740-2021 – Waterproofing of Domestic Wet Areas. Key requirements include:

✔ Waterproofing must extend at least 150mm above shower floors and 25mm above finished floors.

✔ The entire shower area, including walls up to 1.8m high, must be waterproofed.

✔ Timber floors or particleboard must be fully waterproofed before tiling. However, a tile underlay must be installed over timber floors before tiling to provide additional stability and prevent movement that could lead to cracks in tiles and waterproofing layers.

✔ Waterproofing should be completed by a licensed professional to ensure compliance.

✔ Proper sealing around tapware and water pipes – All penetrations must be fully sealed with a waterproof membrane to prevent moisture from entering walls and causing damage.

✔ Trims and junctions require extra care – Any areas where tiles meet different materials (such as aluminum trims or doorways) must be correctly sealed to prevent water ingress.

✔ Recommended trim sizes – For effective waterproofing, use trims of at least 10mm to 12mm for tile edges and junctions to ensure a secure, watertight seal.

🔹 Latest NCC Update: The National Construction Code (NCC) was last updated in 2022, with additional clarifications on waterproofing requirements to ensure improved safety and durability in wet areas. The next update is expected in 2025, bringing further refinements to waterproofing standards.

The Misconception: Tilers Offering Waterproofing Certificates

A common yet misleading practice in the industry is tilers offering waterproofing services and issuing certificates. While some tilers may do an adequate job, they are not always licensed waterproofers, and their work often lacks the required compliance with Australian standards. This can lead to failures, void insurance claims, and costly repairs later.

Why Choose Dellarte Renovations for Waterproofing?

At Dellarte Renovations, we prioritize quality and longevity in every project. Our waterproofing solutions:

✔ Use premium, industry-leading products for maximum durability.

✔ Are completed by licensed and experienced waterproofing specialists.

✔ Come with a 7-year warranty, giving you peace of mind.

✔ Ensure full compliance with Victorian waterproofing standards.

✔ Pay special attention to waterproofing around tapware, water pipes, trims, and junctions, ensuring no weak spots.

The Risks of Skipping Waterproofing

Some builders skip or cut corners on waterproofing to reduce costs, but this leads to serious issues such as:

❌ Water leaks that damage flooring and walls.
❌ Mold and mildew growth, creating health hazards.
❌ Weakening of structural elements over time.
❌ Expensive repairs and renovations down the track.

Skipping waterproofing is not just a cost-saving measure—it’s a serious mistake that can compromise the entire renovation.

Things to Keep in Mind When Waterproofing

When waterproofing your bathroom, laundry, or wet areas, consider the following:

✔ Choose a licensed professional – Ensure they have experience and follow the correct standards. 

✔ Use high-quality waterproofing membranes – Cheap alternatives often fail within a few years.

✔ Allow proper curing time – Rushing the process can lead to cracks and leaks.

✔ Check warranty terms – Always choose a contractor who provides a solid warranty on their work.

✔ Ensure full coverage – Partial waterproofing leaves weak spots that can cause damage over time.

✔ Pay attention to junctions and trims – These areas require careful waterproofing to prevent moisture penetration.

✔ Seal around all tapware and water pipes – These penetration points must be fully waterproofed to prevent leaks behind walls.

✔ Use correct trim sizes – 10mm to 12mm trims should be used to ensure a reliable and waterproof transition between different surfaces.

✔ Use a tile underlay over timber floors – Directly waterproofing on timber can lead to movement and cracks. A tile underlay is necessary for a long-lasting, stable finish.

Get Your Waterproofing Done Right with Dellarte Renovations

Don’t take chances with waterproofing. Whether you’re building a new home or renovating your bathroom, ensure your waterproofing is done professionally, using top-quality materials, and backed by a warranty.

📞 Contact Dellarte Renovations today to discuss your project and ensure your wet areas are fully protected.