How to Tile Foil Underfloor Heating

How to Tile Onto Foil-Backed Underfloor Heating Boards

Tiling onto foil-backed underfloor heating boards requires careful preparation and adherence to specific guidelines. This comprehensive guide will walk you through the entire process for tiling foil backed boards such as the Wunda Underfloor Heating, ensuring a professional and durable finish.

Can You Tile Onto Foil-Backed Boards?

Yes, you can tile onto foil-backed boards, provided you follow the correct specifications. Proper installation and bonding of the boards to the subfloor are crucial for success. The Tilers Hub provides a detailed specification to guide you through this process.

What Primer Do You Use?

The recommended primer for this job is UltraTile ProPrimer. This primer ensures excellent adhesion between the foil-backed boards and the tile adhesive, making it a critical component of the tiling process.

Can You Tile Directly Onto the Boards?

Yes, you can tile directly onto the boards as long as they have been bonded to the subfloor correctly, following the manufacturer’s instructions. After ensuring the boards are properly installed, you can use an S2 adhesive for tiling. We recommend using UltraTile S2 in Grey or UltraTile S2 in White.

Can You Fit LVT to Foil Underfloor Heating Boards?

Yes, you can fit luxury vinyl tiles (LVT) to foil-backed underfloor heating boards. However, you should level the floor to ensure a smooth surface to work with. Proper leveling ensures the longevity and aesthetic appeal of your LVT installation.

What Levelling Compound to Use?

To level the floor directly onto foil-backed boards, you can use UltraTile ProLevel 2 or ProLevel Ultimate. These compounds provide a smooth and even surface, essential for a flawless tile or LVT installation.

Step-by-Step Guide to Tiling Onto Foil-Backed Boards

Tools and Materials You Will Need

1. Ensure Proper Installation of Foil-Backed Boards

Make sure the foil-backed boards have been fitted correctly and are secure. Follow the manufacturer’s instructions carefully to avoid any issues during the tiling process.

2. Prime the Boards

Apply UltraTile ProPrimer to the boards. This primer enhances the bond between the boards and the tile adhesive, ensuring a durable installation.

3. Level the Floor (Optional for LVT)

If you are fitting LVT or do not want to tile directly, level the floor using a suitable levelling compound such as UltraTile ProLevel 2 or ProLevel Ultimate. Ensure the compound is applied according to the manufacturer’s instructions for best results.

4. Apply Tile Adhesive

Once the primer or levelling compound is dry, you can proceed with tiling. Use an S2 tile adhesive such as UltraTile S2 in Grey or UltraTile S2 in White. Follow the manufacturer’s instructions for mixing and applying the adhesive.

5. Lay the Tiles

Start from the center of the room and work your way outwards. Press each tile firmly into the adhesive, ensuring there are no air pockets. Use spacers to maintain even grout lines and achieve a professional finish.

6. Allow the Adhesive to Cure

Follow the manufacturer’s recommended curing time before walking on the tiled surface or applying grout. Proper curing is essential to ensure the tiles bond correctly to the adhesive.

7. Apply Grout

Once the adhesive has cured, remove the spacers and apply grout between the tiles using a grout float. Wipe off excess grout with a damp sponge and allow it to dry according to the manufacturer’s instructions.


By following these steps, you can successfully tile onto foil-backed underfloor heating boards. Proper preparation, using the right products, and following manufacturer instructions are key to achieving a durable and professional finish. For all the products mentioned, visit the Tilers Hub for more information and to purchase the necessary materials.

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