How to Install Tile Backer Boards

Overview

Underfloor heating is a great addition to a wetroom, it gives the added luxury of a warm floor and also helps the shower area to dry out faster, it may also eliminate the need for a radiator in the room.
Our wetroom kits are compatible with most underfloor heating systems, this guide will cover the subject in more detail.  

Electric Underfloor Heating

Most electric underfloor heating systems are simply heating cables attached to a self adhesive mesh mat, this is controlled by a thermostat located outside the room, the stat controls the underfloor heating by means of a temperature sensor installed directly in the floor.
Please view our Electric Underfloor Heating Products here
Our wetroom kits are compatible with all electric underfloor heating systems up to a maximum output of 200W/m².

There are two main methods when it comes to fitting electric underfloor heating in a wetroom, the method used will be dependent upon if you wish to run the heating onto the wetroom tray or not. Underfloor heating inside the wet area is not there to heat the tiles before use as the warm shower water will do that, it is normally installed to dry the area quicker after use.

First work out the floor area to be heated in m², take into consideration any furniture as this will need to be deducted.
It is recommended to use Tile Backer Board underneath electric underfloor heating, it will prevent heat loss, speed up the warm up time and save energy.
All electrical connections should be done by a qualified electrician.
   
The methods outlined below assumes the install is on a timber floor, using a 22mm thick wetroom tray and it is to be tiled.

Method 1  - When Installing Electric Underfloor Heating onto the Wetroom Tray
a. Level the floor with the wetroom tray using 18mm plywood and 4mm Tile Backer Board.
b. Tank the wet area. (see our tanking guide)
c. Install underfloor heating as per the manufacturers instructions, this can go down the falls on the tray and up to the drain grid position.
d. Tile directly onto the cables using a solid bed of adhesive.
Please note that the linear tile insert grids used with the Maxxus Linear and Underlay Linear kits are not compatible with this method as the upstand you tile up to is not adjustable and only designed for a 10mm tile.

UFH Install Diagram 1.jpg

Method 2  - When Installing Electric Underfloor Heating up to the Wetroom Tray
a. The tray needs to be raised from the joists, use 9mm plywood under the entire tray.
b. Lay 18mm plywood on the rest of the floor, overlay this with 4mm Tile Backer Board.
c. Install underfloor heating as per the manufacturers instructions.
d. Pour a 9mm latex screed over the underfloor heating cables, this should now finish level with the wetroom tray. 
e. Tank the wet area.
(see our tanking guide)
f. Tile using a solid bed of adhesive.

UFH Install Diagram 2.jpg

Wet Underfloor Heating

A wet underfloor heating system is simply a heating pipe laid under the floor connected to a manifold, this is controlled by a thermostat located outside the room, the stat controls the underfloor heating by means of a temperature sensor installed directly in the floor.
It is important that this system is designed correctly, please consult a professional, the main thing to remember in relation to the wetroom is that if a wetroom tray (or any other insulating material)  is laid over the top, this area will heat up slower than the rest of the floor, it is not recommended to install wet underfloor heating under the tray or any other bathroom furniture.