Help & advice centre

Everything you need to know about wetrooms and underfloor heating

Wetroom Shower Trays help and advice centre
  • What is a wetroom?

    What is a Wetroom?

    In simple terms, a wet room is a shower room that does away with the shower screen and tray, and has an open and fully tiled shower area.

    Top Tip

    As most bathrooms are not very large, you probably will need to include a shower screen to prevent everything getting sprayed.

  • Water drainage requirements

    A gradient needs to be created along the floor to enable the shower water to drain towards the waste outlet. The minimum recommended fall is 15mm and the maximum recommended ratio is 85:1, (i.e. for every 85mm the incline travels towards the waste outlet the floor level will fall 1mm).

    Water drainage requirements

    Top Tip

    Use a shower tray that has a ready-made gradient sloping towards the drainage.

  • Waterproofing the room?

    Obviously it is critically important to create a 100% waterproof barrier, so maximum consideration needs to be given to waterproofing the wet room.

    Waterproofing the room involves priming the floor and the walls, including the whole of the shower area and laying down a special bitumous membrane across the entire floor and a small way up the walls.

    Waterproofing the room?

    Top Tip

    Once waterproofing is finished, do a flood test before tiling.

    What Tiles should I use?

    What Tiles should I use?

    Choose non-porous bathroom floor tiles which are non slippery for the wet room floor.

  • Planning a wet room?

    Top Tip

    Always make sure that the fall area, i.e. tray, extends to a suitable size.

    The standard sizes for a shower area are:

    • 1200mm x 1200mm
    • 1200mm x 900mm
    • 1500mm x 800mm
    • 1850mm x 900mm

    If you are installing a more compact bathroom then you will have a smaller shower area to contend with, requiring a tray to suit. We do offer a small 800mm x 800mm tray that is ideal for this. With a shower area of this size, a glass enclosure is recommended in an effort to reduce splashing.

    To create a wet room without a screen, the recommended size of the showering area is 1200mm x 1200mm or bigger. This does depend on the type of showerhead being used and whether or not the shower area will include body jets which spray horizontally. Also note that whilst the shower is operating, excess water may spill outside of the immediate showering area. This is not an issue if it lands within the area of the tray as the water splashing onto the gradient will then flow towards the waste outlet. If the water falls on a flat floor surface then it may sit and not drain away.

    Top Tip

    Do not place the intended wet area in obstruction to the basin or WC when accessing from the door.

    Another consideration when planning a wet room is the position of it in the room. A bathroom does not have to have the wet room in the corner as is traditional with shower enclosures. There are many options and you can be creative with design.

  • Underfloor heating.
    Systems to suit all floor types?

    There are 4 main types of Underfloor heating for electric and all do the same thing, warm the floor and the room.

    Every project is different and we will always recommend the most cost effective and suitable system for you, we are experts in all types and won't try and sell you something that isn't suitable.

  • In most cases floor height is only increased by 18mm Underfloor heating for all floor covers

What are the benefits of underfloor heating?

The radiant form of underfloor heating with even heat distribution is far more comfortable and efficient than the convected heat provided by radiators, which draws cold air across the floor, heating it and then convecting it upwards towards the ceiling.

      • Even heat distribution
      • Individual room control
      • Free up wall space
      • No more cold floors
      • Energy efficient save on bills
      • No exposed pipework
      • Minimal maintenance
      • Reduced airborne dust pollution
  • Radiant underfloor heating is more efficient than typical central heating

Still unsure?
Speak to our experts

Technical support: 01268 567018

All our technical staff are fully qualified electricians and plumbers.

We are here to offer expert advice on any issues you may have.


What do I need to build a wet room/walk in shower?

Basic essentials are wetroom shower tray, a fast flow drain and waterproofing materials. A shower screen or screens may also be required.

Can a wet room be installed on concrete floors?

Absolutely. You can either chisel out the floor to allow to install a flat base or build a raised plinth to accomadate the required drainage needs.

How is a wetroom/walk in shower built?

In a wooden floor you will need to firstly take up the floor boards and fit plywood to the supporting battens in the space between the exposed joists. These need to be level with the top of the joists to build a solid platform. Make space for the drain and waste to be fitted before fixing the wetroom shower tray to the platform. Now seal this up and begin waterproofing. With your kit apply using the brush or roller to the entire shower area and walls.

On concrete floors you have 2 options. Either build a plinth to raise the base up and treat it the same as the wooden floor process or chisel out the area to allow for a level base to be installed. Once you have established the floor and made space for drainage then simply follow the same proceedure as the wooden floor.

How much space do I need for a wet room/walk in shower?

The minimum space required is really down to the size of wetroom / shower that you are fitting and if you would also like a WC and basin to be in the same room. Smallest shower tray that we supply is 800mm x 800mm, however height needs to be considered and access. A cupboard under the stairs would be very tricky to convert for example as they tend to have a sloping roof and limited space.

Can a wet room/walk in shower be safely installed on upper floors?

It can be but we would recommend that this be thoroughly waterproofed and tested before tiling to ensure that there are no leakages.

How do I choose the right size?

Once you have decided which room in your home the work will be done to then you need to measure up and thoroughly plan your room layout out before going any further. Once this is done you will know the space and location of your shower and you can work from this point to define the size required. Good rule of thumb is to go slightly larger as you can always trim the wetroom shower tray down to fit.

Where does the drain sit and how much space does it need?

This will depend on the type of drain you have and the positioning in the wetroom shower tray. We offer standard square drains and linear drains which each have there own requirements. However we would recommend if possible to build a support for the drain with ply for the drain to sit on between the joists.

How do I stop water flowing into the rest of the room?

In order to stop the water from flowing into the rest of the room we would recommend deploying a shower screen. There are many size options so select one that suits your needs, a good rule of thumb is the larger the screen the more shielding it will supply to the rest of the room.

Can the wetroom shower tray be made to fit any size of space?

The tray can be cut down to size with a good quality handsaw so long as care is taken to ensure the contours are not compromised and affect the flow of water to the drainage. It is advisable to go for a larger size tray than the area and trim to fit rather than have a smaller tray.

Do I need to waterproof outside the shower area?

You don’t need to if you are deploying a shower screen, however if possible we would advise waterproofing fully to avoid any unexpected accidents. It is advisable if you are only waterproofing the shower area to also waterproof immediately outside of the shower area (towelling off area).

Can I install a wet room/walk in shower in any house/apartment?

In theory you can, however always thoroughly check the area that you intend to install a wet room/shower area before beginning work. You need to check the flooring is adequate and that you have drainage access before beginning any work. As long as you have enough space to install everything and the area is fit for purpose then you can install in any property.