How To Install Marmox Multiboard

How To Install 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.