When renovating your bathroom, some tasks are perfect for DIY, but waterproofing isn’t one of them. This job needs to be done by a professional waterproofer. If not done correctly, leaks can cause serious problems like:

• Plasterboard decay
• Mould growth
• Rising damp
• Peeling paint
• Structural damage

Fixing these issues will likely cost more than the initial waterproofing, so it’s wise to get it done right the first time.

---

Similar stories:

• Why is my refrigerator leaking water? What to do if my refrigerator is leaking water?

• What are the 4 common types of faucets? How to choose the right faucet?

---

How Does Bathroom Waterproofing Work?

Bathrooms are constantly exposed to moisture and water. Without proper waterproofing, water can seep into the structure of your home, leading to:

1. Structural Damage: Water can weaken the structure, leading to costly repairs.
2. Mould and Mildew: These can cause health problems and unpleasant odours.
3. Aesthetic Issues: Water damage can ruin paint, tiles, and fixtures.

The Waterproofing Process

1. Preparation:
   • Clean the Area: Start by thoroughly cleaning the bathroom surfaces. Remove any dust, dirt, or loose particles. This ensures the waterproofing materials adhere properly.
   • Repair Damages: Fix any cracks or holes in the walls and floors. These can be entry points for water.
2. Priming:
   • Apply a primer to the surfaces that need waterproofing. This helps the waterproofing membrane adhere better. Primers are usually brushed or rolled onto the surfaces.
3. Applying the Waterproofing Membrane:
   • Liquid Membranes: These are applied with a brush or roller. They form a seamless, flexible barrier when dry. They are great for corners and areas with complex shapes.
   • Sheet Membranes: These are sheets of waterproof material that are adhered to the surface. They are cut to fit and are great for large, flat areas.
   • Seal Joints and Corners: Use reinforcing tape or mesh on joints and corners before applying the membrane. These areas are prone to movement and need extra protection.
4. Curing:
   • Allow the membrane to dry and cure according to the manufacturer’s instructions. This is crucial for ensuring the membrane forms a strong, durable barrier.
5. Tile Installation:
   • Once the waterproofing is done and cured, you can proceed with tiling the bathroom. Use a suitable tile adhesive and grout to ensure a waterproof finish.

Key Areas to Waterproof

1. Shower Area:
   • This is the most critical area. Ensure the shower floor and walls are thoroughly waterproofed.
2. Floor:
   • The entire bathroom floor should be waterproofed, especially around drains and fixtures.
3. Walls:
   • Waterproof the lower parts of the walls (up to about 1 meter high). In the shower area, waterproof up to the height of the showerhead.

Tips for Effective Waterproofing

1. Follow the Manufacturer’s Instructions:
   • Each product has specific instructions for application and curing times. Follow them carefully.
2. Use Quality Products:
   • Invest in high-quality waterproofing materials. They might be more expensive but are worth it in the long run.
3. Check for Leaks:
   • Before tiling, test the waterproofing by flooding the bathroom floor with water. Check for any leaks and address them immediately.
4. Professional Help:
   • If you’re unsure about any step, consider hiring a professional. Proper waterproofing is crucial and worth the investment.

Maintenance and Inspection

Regularly inspect your bathroom for signs of water damage or leaks. Early detection can prevent serious issues. If you notice any problems, address them promptly to maintain the integrity of the waterproofing.

Does My Bathroom Water Proofer Need to Be Licensed?

In New South Wales (NSW) and Queensland, the person who performs bathroom waterproofing must hold a current waterproofer’s license. This requirement ensures the work is done properly and meets safety standards.

Definition of Waterproofing in NSW

NSW Fair Trading defines waterproofing as work that involves any protective treatment of a dwelling designed to prevent the penetration of water or moisture. It includes the protective treatment of wet areas to prevent unwanted water escape using solid membranes or membranes applied by brush, roller, or other methods.

Training Requirements

To become licensed, a waterproofer must complete a Certificate III in Construction Waterproofing. This training ensures they have the necessary skills and knowledge to perform waterproofing effectively.

Other Licensed Trades

Some related trades, such as tilers, may also be licensed to carry out waterproofing. This means that in some cases, a qualified tiler can perform waterproofing tasks, but it’s essential to check their credentials and ensure they are properly licensed.

Requirements in Other States and Territories

In other Australian states and territories, a qualified waterproofer must issue a compliance certificate upon completing the job. This certificate serves as proof that the waterproofing work meets all required standards.

What to Expect from Your Waterproofer

When hiring a waterproofer, ensure they provide you with a waterproofing certificate and warranty once the job is done. This documentation is crucial for future reference and in case any issues arise.

Why Licensing Matters

Hiring a licensed waterproofer ensures:

1. Quality Work: Licensed professionals are trained and qualified to perform waterproofing effectively.
2. Compliance: The work complies with local building codes and standards.
3. Warranty: You get a warranty and certification, which are vital for future claims or issues.

In short, if you live in NSW or Queensland, your bathroom waterproofer must be licensed. In other states and territories, a compliance certificate from a qualified water provider is necessary. Always check for proper licensing and documentation to ensure the work is done correctly and to protect your investment.

How Much Does Bathroom Waterproofing Cost?

Bathroom waterproofing costs can vary, but it can start as low as $40 per square meter, which is on the lower end. Typically, you can expect to pay between $500 and $750 to fully waterproof an average-sized bathroom. However, several factors can influence the cost.

Factors Affecting Cost

1. Number of Bathrooms:
   • If waterproofing is done in multiple bathrooms or as part of a complete renovation, the cost per bathroom may be lower.
2. Size and Type of Bathroom:
   • Larger bathrooms, wet rooms, or bathrooms on a second story may incur higher costs due to the complexity and additional materials needed.

Getting the Best Price

To ensure you get the best price and service, it’s wise to get quotes from several waterproofing services. Here are some tips:

1. Request Detailed Quotes:
   • Ask each service to provide a detailed breakdown of the scope of their work. This helps you understand exactly what is included in the price.
2. Check Reputation:
   • Choose a company with a good reputation rather than simply going for the lowest price. Quality and reliability are crucial for waterproofing to be effective.

Finding Local Prices

The most accurate way to determine the cost of your specific project is to get quotes from local bathroom waterproofers. This will give you a sense of the current market rates in your area.

Important Notes

• Prices Can Vary: The costs mentioned are indicative and can vary based on location and market conditions.
• Use as a Guide: These prices should be used as a general guide and not as definitive costs.

In summary, bathroom waterproofing typically costs between $500 and $750 for an average-sized bathroom, but this can vary based on several factors. Getting multiple quotes and choosing a reputable company will help ensure you get a fair price and quality service.