At TradesPro, we have used Knauf Aquapanel for both walls and floors for many years, and it has performed brilliantly. Designed to reduce inflexion and provide a perfect sub straight for tiling, you need to prime this product with an acrylic primer before tiling.
The downsides of Aquapanel are that it will very quickly blunt any cutting tool, so your hole saws and hand saws won’t last long; use old ones. You can snap it as you would plasterboard, and it does crumble easily. The high price point may also be an issue for big projects.

AQUAPANEL® Floor Tile Underlay is made from tough Portland cement and has a coated fibre mesh embedded in the core. At only 6mm thick, room height is not compromised. It will not rot or warp nor will it deteriorate in water. AQUAPANEL® Floor Tile Underlay offers very high impact resistance.


  • Knauf AQUAPANEL® Cement Board Floor Tile Underlay is a light, highly stable dry floor panel, perfectly suited for ceramic, mosaic or natural stone
  • The thickness of only 6mm allows you to maximize floor to ceiling height
  • Can be installed over existing wooden subfloors
  • It will not deteriorate in water and is resistant to mould and mildew
  • Cut using the score and snap technique which means you can install the boards quicker and without specialist cutting equipment, as well as reducing the amount of dust created
  • As part of the Knauf AQUAPANEL® Cement Board range, it is resistant to water or mildew and thus an ideal solution for wet and humid areas
  • Ideal for floor refurbishment in bathrooms, wet rooms and kitchens
  • Install using Knauf AQUAPANEL® floor tile underlay screws and Knauf AQUAPANEL® Jointing tape
  • Suitable for indoor use only


  • Crumbles easily
  • Blunts cutting tools
  • Expensive compared to alternatives