Tile Fix Direct Blog

October 2014

How To Install Marmox Multiboard

Marmox Multiboard

Marmox Multiboard is a tile backer board suitable for waterproofing, insulating and dry lining. When installing a wet room or walk in shower, tile backer boards are essential for creating a watertight base. The boards are made from rigid extruded polystyrene with a bonded cementitious coating to both sides so you won’t have to worry about rotting, deformation or weakening. When used with electric underfloor heating, the tile backer boards act as an insulating layer to stop heat escaping beneath the tiles.

Marmox tile backer boards are suitable for use with all types of tiles including ceramic, porcelain, slate, marble and stone. They are extremely lightweight and easy to cut, whilst also being able to hold substantially more weight than other wall surfaces; when used on walls they hold 62kg/m2, and 40 tonnes/m2 on floors. Once fitted, Marmox Multiboard can be tiled or plastered on to immediately.

Marmox Multiboard Installation Methods

Timber Frame

1. Choose the correct board based on your frame, Marmox recommends 20mm or thicker for a stud wall built at 600 centres, 12.5mm for 400 centres and 10mm for 300 centres. 10mm boards are not recommended for use on walls.
2. Fix the boards to the timber frame using a stainless steel screw and washer at every 300mm.

Solid Wall – Screw Fixed

1. Measure an cut to size the Marmox Multiboard using a knife or saw.
2. Fix the boards to the walls using stainless steel screws and washers at every 300mm.

Solid Wall – Adhesive

1. Make sure the wall has been dusted and is free from any protrusions.
2. Comb a cement based flexible adhesive over the surface of the Multiboard or wall using a 6/8mm trowel.
3. Press the board firmly on to the wall.

Solid Wall – Fixing Dowels

1. Measure an cut to size the Marmox Multiboard using a knife or saw.
2. Drill fixing holes through the board into the solid wall; for short boards drill 5 holes – 1 in each corner and in the middle, and for long boards drill 6 holes around the edges and 2 in the middle.
3. Put a dab of cement based flexible tile adhesive over each hole on the board, then push firmly against the wall.
4. Push in the white dowel and hammer in the red pin.

Floor – Adhesive

1. Make sure the floor is dirt free and level, and any loose boards are secured.
2. Comb the adhesive on to the floor using a floor trowel.
3. Lay the boards on to the adhesive and push down firmly.

Floor – Screw Fixed

1. Fix to the floor using a stainless steel screw and washer at every 300mm.
2. Ensure that the screw beds into the floor by at least 30mm.

Tape all the joints with reinforcing tape, if the area needs to be waterproof add self-adhesive waterproof tape to all corners and joints. You can now begin tiling on to the Marmox Multiboard. If you are plastering instead of tiling, coat first with 1 part PVA and 4 parts water and begin plastering when the primer is still tacky.

Tile Fix Direct stocks a great range of Marmox Multiboard available to order online.

Wet Room Waterproofing Tips

Wet Room Waterproofing Tips

With wet rooms continuing to increase in popularity in the UK, it’s no surprise that many fixers and fitters are including them in their services offered. While tiles and waterproof adhesive and grout do help to keep moisture out of the walls in traditional bathrooms, wet rooms require an additional layer of waterproofing to protect against leaks.

Waterproofing, or tanking, the entire room is essential in a wet room as water can, and will, get everywhere. A wet room is intended to essentially turn the whole room into the shower enclosure, so expect moisture to cover most of the room. We’ve put together some quick tips for ensuring your wetroom is completely waterproof which should help avoid any costly damages in the future.

  • Prepare walls and floors before you begin; remove any old adhesive or flaking paint and plaster and ensure the walls are smooth and flat. If you have filled any holes in the walls, allow the filler to dry before applying waterproofing compound or adhesive.
  • Locate and mark all water and power points; once waterproofing is complete, the surface area shouldn’t be punctured.
  • Fully tank your wet room to ensure it is waterproof. Although only waterproofing around the shower area might seem tempting, it means your wet room is not completely protected against leaks which could cause considerable damage.
  • Use waterproof tape and compound on joints and corners to reinforce them and protect against leaks.
  • If you are using tile backer boards try to stagger the joints when fixing to walls.
  • Choose a drain that is suitable for wet rooms as this will be designed to withstand large amounts of water.
  • Install a wet room shower tray as this has a built in slope, or fall, which will encourage water to flow into the drain and not pool on the floor.
  • Choose lighting that is suitable for the area; bathroom lighting is given an IP (Ingress Protection) rating – the higher the number the more waterproof it is. Which one you will need depends on the position of the light fitting within the room.

Tile Fix Direct has a great range of wet room waterproofing products available to order online, as well as helpful wet room installation guides and advice.

Warm Your Home with DEVI Electric Underfloor Heating

Since 2003 global market leader DEVI has been part of the Danfoss Group – Denmark’s largest industry company. The company produces a range of electric heating systems, including their popular DEVI underfloor heating systems DEVImat and DEVIflex. These electric underfloor heating solutions are extremely easy to install, and safe and simple to use.

DEVI Products Available At Tile Fix Direct

DEVImat Electric Underfloor Heating

DEVImat electric underfloor heating mats are self-adhesive mats with heating cables pre-attached. This means that installers do not need to lay and fix a pattern with the cable, and can just easily peel and stick them down.

The mats have a width of 0.5m and are available in a range of lengths from 1m² to 12m², meaning they can be used to heat a wide variety of room sizes. The mats are thin, which means they won’t adversely impact on the level of the floor; have a lead free PVC outer sheath and a 100% aluminium earth shield. The mats are available in 100W, 150W or 200W so you will be able to find the right mat to suit your needs.

DEVIflex Loose Lay Cable Underfloor Heating

DEVIflex is a loose cable electric underfloor heating system which is ideal for small or awkward spaces where mats cannot be easily laid. The cable can be used with on concrete or wood subfloors to heat tiles, carpet, wood and vinyl flooring.

DEVIflex is under 4mm thick and is available in a range of lengths from 0.65m to 17m2. The cable is flame retardant, features one cold tail and the outer sheath is made from lead free PVC. This product is covered by the DEVI 20 year floor guard warranty, which not only guarantees the heating system but also the floor, in the unlikely event that the system cannot be repaired due to a manufacturing fault.

DEVIreg Thermostats

When installing DEVI electric underfloor heating you will need a thermostat to control the temperature, and there are several great products available. The DEVIreg 535 is a 7 day programmable thermostat which can sense the floor temperature alone, or the floor and room temperatures.

If you’re looking for something more modern looking the DEVIreg Touch is the option for you. Available in black or white, this touch screen thermostat is innovative and simple to use. The DEVIreg Touch is equipped with an open window detection system that automatically turns off the underfloor heating should it detect a window is open in the room – this helps to reduce energy consumption and ultimately saves on cost.

DEVIlink is a system that wirelessly links your electric underfloor heating system so you can control each rooms temperature from anywhere in the house. Most DEVI thermostats can be used with all underfloor heating systems, including those from other manufacturers.

DEVIpipe Frost Protection Cable

DEVIpipe will give you peace of mind over the cold winter months that you’re pipes will be protected from freezing. Using a special polymer composite core, the DPH-10 cables automatically adjust the heat provided based on the ambient temperatures around them.

Benefits Of Electric Underfloor Heating

  • Easy to install mats or cables
  • Great for small or awkwardly shaped spaces
  • Helps evaporate water from floors in wet rooms and entrance ways
  • Heats room at a lower temperature than traditional radiators
  • Doesn’t take up room and increases wall space by replacing radiators
  • Reduces dust traps caused by radiators
  • Quickly and easily control heating using a DEVI thermostat

DEVI electric underfloor heating is perfect for tiled floors in halls, kitchens, conservatories, bathrooms, and wet rooms. Browse the full range of DEVI electric underfloor heating products online at Tile Fix Direct.

Why Use A Tile Backer Board?

Tile Backer Board

Tile backer boards are being used more and more in tiling projects due to their versatility and range of benefits. They can be used to waterproof a wet room, as insulation boards with electric underfloor heating, as dry lining and home insulation, and of course the obvious flat surface for tiling. In this blog we take a closer look at the advantages of using a Tile Backer Board.


Tile Backer Boards are perfect for wet rooms as they create a waterproof barrier behind the tiles. The cement boards are made from rigid extruded polystyrene with a bonded cementitious coating to both sides so you don’t ever have to worry about rotting, deformation or weakening.

Perfect For Tiling

A Tile Backer Board can hold substantially more weight than other traditional wall surfaces. Each board can hold around 60kg, over double the weight plaster can hold, which is great for large or heavy tiles. The boards are also designed with adhesion in mind, so the bond created with adhesive and grout is much stronger than other materials, for example plywood. Using a Tile Backer Board also gives a smooth and flat surface to tile on to, and you can tile or plaster as soon as the boards are installed.


A Tile Backer Board is a great insulation solution for dry lining buildings, insulation wet rooms or improving the efficiency of underfloor heating.

Increases Tile Choice

The Tile Backer Board creates a smooth foundation to be tiled upon as well as being extremely compatible with a variety of tiles such as marble, limestone, granite and much more. Its versatility makes it suitable for floors, walls and can also fit into awkward spots and corners with curved backer boards.

Other Benefits

  • Lightweight
  • Easy to install
  • Extremely strong and durable

Tile Fix Direct stocks Tile Backer Board in 1220mm, 1250mm, 2440mm and 2500mm lengths, available in the following thicknesses:

  • 4mm
  • 6mm
  • 10mm
  • 12.5mm
  • 20mm
  • 30mm
  • 50mm

Product Focus: Schlüter DITRA-SOUND Mat


The sound of someone moving around in another room is often an annoyance to many of us. Footsteps or dropped objects cause sound to travel to adjoining or underlying rooms, and this is called ‘impact sound transmission’. The impact sound is also reflected throughout the room, particularly with hard surfaces like tiled floors. Schlüter DITRA-SOUND is an easy to install matting that combats this problem.

Functions of Schlüter DITRA-SOUND

  • Impact Sound Insulation
  • Crack Bridging or Decoupling
  • Load Distribution

DITRA-SOUND is a heavy polyethylene mat with an anchoring fleece laminated on both sides to ensure it bonds with the tile adhesive. Each 750x550x3.5mm tile can be used on a variety of substrates including concrete, cement screeds, calcium sulcate screeds, heated screeds, treated plywood panels, hardwood floors and synthetic coverings & coatings. It can even be used on stairs to quieten the sound of each step and it is waterproof, as well as being largely resistant to the effects of watery solutions, salts, acids and alkalis, many organic solvents, alcohols and oils.

Installation of Schlüter DITRA-SOUND

  • Ensure the substrate is level and ready to bear weight
  • Use the self-adhesive insulation strip where the matting will meet walls and other upright construction elements
  • Choose a thin-bed mortar that is suitable for your substrate type, this will ensure bonding with the anchoring fleece
  • Apply the mortar over the substrate using either a 3mm or 4mm notched trowel
  • Cut the Schlüter®-DITRA-SOUND mat to size and fully embed the anchoring fleece in the applied adhesive.
  • Immediately press the material into the mortar with a float or a roller, working in a single direction. Ensure the individual panels are set tightly next to one another and scrape away any excess mortar.
  • Cover all joints with self-adhesive joint strip to avoid sound bridges
  • Tiles can be installed immediately after the mat, using a thin-bed mortar. It is recommended to use walking boards to avoid damage or to prevent debonding from the substrate.

Before installing carefully check the manufacturers instructions and compatibility of the products. See the below video for further installation guidance.

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