Types of Tile Waterproofing Systems

Modern tile waterproofing systems are available in several forms, each designed for specific applications and installation methods. While they all aim to prevent water from reaching the building structure, they differ in how they are installed and where they are most commonly used.

Choosing the correct waterproofing system depends on the substrate, the type of project and the level of water exposure.

Liquid Waterproof Membranes

Liquid-applied membranes are one of the most common waterproofing systems used in domestic bathrooms.

Applied with a roller, brush or trowel, they cure to form a flexible waterproof layer beneath the tiles.

They are commonly used on:

• Shower walls.
• Bathroom floors.
• Wet rooms.
• Concrete.
• Cement backer boards.

Many systems require reinforcing tape at corners and joints.

Sheet Membranes

Sheet membranes are supplied as waterproof rolls that are bonded to the substrate using adhesive.

Advantages include:

• Consistent membrane thickness.
• Immediate waterproofing.
• Excellent crack-bridging performance.
• Suitable for demanding installations.

Sheet membranes are widely used in wet rooms, commercial bathrooms and premium residential projects.

Waterproof Tile Backer Boards

Some cement-based and foam-core tile backer boards are inherently water resistant or waterproof.

These boards provide a stable substrate for tiling and can form part of a waterproofing system when the joints, fixings and penetrations are correctly sealed.

They are commonly used instead of plasterboard in shower areas.

Waterproofing Tapes and Accessories

Corners, wall junctions, floor junctions and pipe penetrations are often the most vulnerable areas for water ingress.

Specialist accessories include:

• Reinforcing tapes.
• Internal corners.
• External corners.
• Pipe collars.
• Drain collars.

These components help maintain a continuous waterproof barrier.

Wet Room Systems

Wet room systems often combine several waterproofing products into one complete installation system.

This may include:

• Pre-formed shower formers.
• Waterproof membranes.
• Drain assemblies.
• Waterproof tapes.
• Sealing accessories.

Which Waterproofing System Is Best?

There is no single system suitable for every installation.

The most appropriate choice depends on:

• The substrate.
• Whether the project is new build or renovation.
• The level of water exposure.
• The type of tiles being installed.
• The manufacturer's recommendations.

The waterproofing products should always be installed in accordance with the manufacturer's instructions.

Common Misunderstandings

Conclusion

Modern tile waterproofing systems range from liquid membranes and sheet membranes to waterproof tile backer boards and complete wet room systems. Each offers advantages for particular applications, but all share the same purpose: protecting the building structure from water that may pass behind the tiled finish.

Selecting the correct system and installing it in accordance with the manufacturer's guidance is an essential step in creating a durable and watertight tiled installation.