How to Install a Wetroom Guide

This guide will give an overview of how to install a wetroom using both our Maxxus and Underlay wetroom trays.
Please see this guide to choosing the right wetroom system for more information on the differences between these tray types
.
This guide will cover a level access and tiled installation only.
Please see this page for detailed installation instructions to the system you are using.  

Installation Guide

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The Maxxus wetroom trays are load bearing and can support up to 470kgs when installed over 400mm joist centres.
They are suitable for use with tiles, microcement and vinyl flooring. 

Installation on Timber Floors

  1. First remove the floor boards to expose the joists where the tray is to be fitted.

  2. Inspect the integrity of the existing joists and if in doubt remedial action should be taken to ensure the floor is stable with no movement.

  3. Small or weak parts of the existing floor boards should be replaced with plywood.

  4. The Maxxus tray can be laid over joists, however if joist centres are greater than 400mm install additional noggins for support.

  5. Support all edges of the Maxxus tray and the unsupported edges of the existing floorboards with noggins.

  6. To install the drain and waste connection follow the instructions for your specific wetroom system. 

  7. Pilot drill the tray and screw it down to the joists securely using wood screws. Tray may be screwed anywhere, not just the edges.  

  8. Check the tray is level and has no movement.

  9. The Maxxus tray is 22mm thick, floorboards are normally 18mm, so level the rest of the floor with 4mm plywood or Tile Backer Board.

  10. You are now ready to tank - How to waterproof a wetroom guide.

Maxxus Wetroom Tray Installation into Timber Floor
Maxxus Wetroom Tray Installation into Timber Floor
Maxxus Wetroom Tray Installation into Timber Floor

Installation on Concrete Floors

  1. Chisel out the area where the tray is to fitted, this must be deep enough to accommodate the tray and a bed of cement mix.

  2. Consult your specific wetroom system instructions to view the drain arrangement and installation method.

  3. Chisel out for the drain and waste pipe run.

  4. Bed down the tray on a cement mix, make sure it is level and level with the surrounding floor and allow to dry.

  5. Pilot drill the tray and screw down.

  6. Ensure there is no movement and the tray is still level.

  7. You are now ready to tank - How to waterproof a wetroom guide.

Wetroom Tray Installation into Concrete Floor
Underlay Wetroom Tray Installation into Concrete Floor

Installation Guide

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Underlay Plus Wetroom Kit

The Underlay wetroom trays are made from extruded XPS with a tough impact resistant surface.
They must be supported underneath and are suitable for tile floors only.

Installation on Timber Floors

  1. First remove the floor boards to expose the joists where the tray is to be fitted.

  2. Inspect the integrity of the existing joists and if in doubt remedial action should be taken to ensure the floor is stable with no movement.

  3. Small or weak parts of the existing floor boards should be replaced with plywood.

  4. Consult your specific wetroom system instructions to view the drain arrangement and installation method.

  5. Support the edges of the existing floor with noggins.

  6. Install 18mm ply level with the top of the joists.  

  7. Bed the tray down on tile adhesive making sure there are no cavities underneath. Ensure the tray is level and allow to dry. 

  8. Check the tray has no movement.

  9. The Underlay trays vary in thickness, level the rest of the floor to the tray with plywood or Tile Backer Board.

  10. You are now ready to tank - How to waterproof a wetroom guide.

Underlay Plus Wetroom Tray Installation into Timber Floor
Underlay Plus Wetroom Tray Installation into Timber Floor

Installation on Concrete Floors

  1. Chisel out the area where the tray is to be fitted, this must be deep enough to accommodate the tray and a bed of cement mix.

  2. Consult your specific wetroom system instructions to view the drain arrangement and installation method.

  3. Chisel out for the drain and waste pipe run.

  4. Bed down the tray on a cement mix or tile adhesive, make sure it is level and level with the surrounding floor and allow to dry.

  5. Ensure there is no movement and the tray is still level.

  6. You are now ready to tank - How to waterproof a wetroom guide.

Fitting a Wetroom Tray on a Solid Floor
Fitting a Wetroom Tray on a Solid Floor