Marmox Multiboard Tile Backer Board (1250mm x 600mm)

  • Waterproofing, dry lining & a barrier against damp
  • High performance load bearing - 40 tonnes/m²
  • Energy Saving Trust & BBA Approved Board
  • Reduces acoustics and impact sound by 25 dB
  • Easy to work with & cut to size with a working knife
From £13.50 inc. VAT
From £11.25 exc. VAT

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The original Marmox Multiboard is ideal for a variety of applications, which is why it’s one of the leading boards on the market today. Multiboards have a wide range of uses from waterproofing walls and floors to providing thermal insulation and dry lining. When used in bathrooms you get a tile backer board, waterproofing, and insulation all in one easy to install board! Marmox Multiboards are also used as insulation boards and are the easiest solution for insulating and waterproofing a room in one quick and easy install.

Made from reinforced high performance extruded polystyrene, each side of the waterproof board is faced with fibreglass mesh embedded into a cement polymer mortar. This rigid construction makes these boards perfect to use on the floor with underfloor heating wire systems. Using Multiboards in this scenario improves the efficiency and reduces your heating costs. These boards are also used as tile backer boards because they act as an effective and easy to work with decoupling layer. As the Marmox Multiboard is safely and securely fixed to walls and floors, it forms a barrier between them and your tiles. This helps to prevent tiles and grout cracking due to horizontal movement.

We routinely see Multiboards used as waterproof tile backer boards, electric underfloor heating insulation and in wet room construction. They can also used for dry lining and insulation of cellars and loft conversions, as well as rigid partition wall boarding too. Here at The London Tile Co we stock the standard Marmox Multiboards in 1250mm x 600mm in thicknesses ranging from 4mm up to 50mm.

Features and Benefits of Marmox Multiboards

  • Waterproofing, dry lining & a barrier against damp
  • Thermal insulation for walls, floors and ceilings
  • Reduces acoustics and impact sound by 25 decibels
  • High performance load bearing - 40 tonnes/m²
  • Decoupling layer board with high flexural strength
  • CFC & HCFC & Asbestos free keeping you safe
  • Easy to work with and cut to size with a working knife
  • Unaffected by freeze/thaw cycle
   

How to install Marmox Multiboards on a timber frame.

Preparation: For a stud wall build with 600mm centres, use 20mm Marmox Multiboard or thicker. 10mm and 12.5mm thick boards require studs at 300mm centres. All board edges should be supported.

Fixing:Use a tile backer board screws and washers every 300mm on each stud. The washers prevent pitting in the board surface. When a stud is at 600mm centres, use 20 rows of 5 fixings. At 300mm centres, use 3 rows of 5 fixings.

Tiling: Be sure to tape all the joints with Marmox Reinforcing scrim tape, except in wet areas where Marmox Self-Adhesive Waterproof tape should be used. The boards are now ready to be tiled.

Plastering: Seal boards together using a bead of Multibond prior to scrim-taping, do not use Waterproof tape under plaster. The boards are now ready to be plastered.

How to install Marmox Multiboards on a solid wall - screw fixed

Preparation: Measure Marmox Multiboards and cut to size. Tile backer boards are very easy to cut with a knife or saw.

Fixing:Marmox Multiboards can be fixed to solid wall with screws and washers at every 300mm. Alternatively use Tile Backer Board Fixing Dowels for ease.

Tiling: Be sure to tape all the joints with Marmox Reinforcing scrim tape, except in wet areas where Marmox Self-Adhesive Waterproof tape should be used. The boards are now ready to be tiled.

Plastering: Seal boards together using a bead of Multibond prior to scrim-taping, do not use Waterproof tape under plaster. The boards are now ready to be plastered.

How to install Marmox Multiboards on a solid wall - adhesive fixed

Preparation: Measure Marmox Multiboards and cut to size. Tile backer boards are very easy to cut with a knife or saw.

Fixing: Use a 6/8mm trowel to comb adhesive over the who surface of the Marmox Multiboard. For uneven walls increase to a 20mm trowel. Push firmly onto wall. Ideally stagger the joints if you can.

Tiling: Be sure to tape all the joints with Marmox Reinforcing scrim tape, except in wet areas where Marmox Self-Adhesive Waterproof tape should be used. The boards are now ready to be tiled.

Plastering: Seal boards together using a bead of Multibond prior to scrim-taping, do not use Waterproof tape under plaster. The boards are now ready to be plastered.

How to install Marmox Multiboards on a solid wall - dot & dab fixed

Preparation: Create 5 fixing holes through the Marmox Multiboard. 12.5mm board thickness is the minimum thickness for this fixing method.

Fixing: Put a dab of tile adhesive over the holes positions. Offer the board up to the wall, push firmly, and then use a spirit level to get everything level. Once your tile adhesive has dried, drill the holes out. Place the dowl in through the board into the wall and then hammer in the pin.

Tiling: Be sure to tape all the joints with Marmox Reinforcing scrim tape, except in wet areas where Marmox Self-Adhesive Waterproof tape should be used. The boards are now ready to be tiled.

Plastering: Seal boards together using a bead of Multibond prior to scrim-taping, do not use Waterproof tape under plaster. The boards are now ready to be plastered.

How to install Marmox Multiboards on floors - screw fixed

Preparation: Lay your boards out on the floor and cut them to size easily using a blade or saw.

Fixing: For screw fixing use a screw and washer at every 300mm.

Tiling: Be sure to tape all the joints with Marmox Reinforcing scrim tape, except in wet areas where Marmox Self-Adhesive Waterproof tape should be used. The boards are now ready to be tiled.

Plastering: Seal boards together using a bead of Multibond prior to scrim-taping, do not use Waterproof tape under plaster. The boards are now ready to be plastered.

How to install Marmox Multiboards on floors - adhesive fixed

Preparation: Use a floor trowel to comb the adhesive onto the floor.

Fixing: Lay the Marmox Multiboard down onto the adhesive and push firmly. You can use Marmox Multibond for further waterproofing or in really wet areas use Marmox Self Adhesive Waterproof Tape.

Tiling: Be sure to tape all the joints with Marmox Reinforcing scrim tape, except in wet areas where Marmox Self-Adhesive Waterproof tape should be used. The boards are now ready to be tiled.

Plastering: Seal boards together using a bead of Multibond prior to scrim-taping, do not use Waterproof tape under plaster. The boards are now ready to be plastered.

 

Delivery Times

Delivery times for all delivery services are Monday to Friday (excluding Bank Holidays) 8am - 6pm. A 'working day' is Monday to Friday, excluding bank holidays. Weekends and bank holidays do not count as working days.

Delivery Costs

For information on delivery costs, please visit the main Delivery page.

Delivery Damages

It's important that you indicate the damages on the delivery note when you sign for the goods. Notify The London Tile Company by calling our advice line on 0333 320 80 48 if there are any damages or irregularities to your order within 24 hours of delivery.

 

Frequently asked questions about Marmox Boards

How do I fix Marmox boards?

There are several different methods to fix these boards depending on where they are going, and how you'd like to fix them. We've got it all covered in the How to Guide tab above. We also have installation bundle packs readily available where we've created a shopping list of everything you'd need to install Marmox Multiboards in most simple scenarios .

What is Marmox Board?

Marmox Boards are waterproofing tile backer boards made from CFC and XPS extruded polystyrene foam bonded with layers of fibreglass reinforced polymer cement. The surface of reinforced polymer concrete is perfect for tile adhesion, waterproofing or plastering. Marmox Boards are difficult to bend, bow or distort compared to plasterboard.

Are Marmox Boards waterproof?

Marmox Multiboards are completely waterproof and impermeable to water. They are commonly used to protect walls and floors in wet rooms, bathrooms and kitchens.

Is Marmox Board Fireproof?

Generally speaking yes. Marmox boards are rated as is class “O”, indicating that they generally not burn except in circumstances where they are in contact with flammable materials or extremely high temperatures in excess of 350°C.

What is Marmox Board made of?

Marmox Insulation Boards are made of extruded polystyrene. This high performance, reinforced dry-lining insulation boards made of waterproof extruded polystyrene, each side being faced with fibreglass mesh embedded into a waterproof cement polymer mortar.

Can you cut Marmox Board?

Marmox boards are very easy to cut to size using a standard working knife.

What thickness board is sufficient to make a difference to heat loss?

To meet current building regulations very thick layers are required. In our experience, using at least a 20mm thick Marmox Multiboard will make a noticeable reduction to the heat loss and provide insulation.

How many fixings are needed per board?

Without using any adhesive, a short board will need two rows of five (10) or if the board is 12.5mm or 10mm thick, three rows of four (12). A long board will require 15 fixings; three rows of five.

Used with adhesive (the dot and dab method), five fixings per short board and nine fixings per long are recommended.

On floors, the tile adhesive method should be used whenever possible. If the only practical option is mechanical fixing, screws and washers should be used every 30cm – that is 15 per board.

Can I plaster directly onto Marmox Boards?

Yes! With no priming required either! The surface of the boards contains additives to reduce the porosity and stop the possible formation of ettringite salts which can sometimes occur when a gypsum plaster is applied to a concrete surface. The boards therefore do not need to be primed..

How many boards will I need?

Small boards are 0.6m x 1.25m - that's three quarters of a square metre so you need to divide the area you want by three quarters and that's the number of 'short boards' you require.

1 Review Hide Reviews Show Reviews

  • 5
    Marmox

    Posted by Jason on 12th Dec 2023

    great stuff, use it all the time, great for wet rooms and general tile showering.

Frequently asked questions about Marmox Boards

How do I fix Marmox boards?

There are several different methods to fix these boards depending on where they are going, and how you'd like to fix them. We've got it all covered in the How to Guide tab above. We also have installation bundle packs readily available where we've created a shopping list of everything you'd need to install Marmox Multiboards in most simple scenarios .

What is Marmox Board?

Marmox Boards are waterproofing tile backer boards made from CFC and XPS extruded polystyrene foam bonded with layers of fibreglass reinforced polymer cement. The surface of reinforced polymer concrete is perfect for tile adhesion, waterproofing or plastering. Marmox Boards are difficult to bend, bow or distort compared to plasterboard.

Are Marmox Boards waterproof?

Marmox Multiboards are completely waterproof and impermeable to water. They are commonly used to protect walls and floors in wet rooms, bathrooms and kitchens.

Is Marmox Board Fireproof?

Generally speaking yes. Marmox boards are rated as is class “O”, indicating that they generally not burn except in circumstances where they are in contact with flammable materials or extremely high temperatures in excess of 350°C.

What is Marmox Board made of?

Marmox Insulation Boards are made of extruded polystyrene. This high performance, reinforced dry-lining insulation boards made of waterproof extruded polystyrene, each side being faced with fibreglass mesh embedded into a waterproof cement polymer mortar.

Can you cut Marmox Board?

Marmox boards are very easy to cut to size using a standard working knife.

What thickness board is sufficient to make a difference to heat loss?

To meet current building regulations very thick layers are required. In our experience, using at least a 20mm thick Marmox Multiboard will make a noticeable reduction to the heat loss and provide insulation.

How many fixings are needed per board?

Without using any adhesive, a short board will need two rows of five (10) or if the board is 12.5mm or 10mm thick, three rows of four (12). A long board will require 15 fixings; three rows of five.

Used with adhesive (the dot and dab method), five fixings per short board and nine fixings per long are recommended.

On floors, the tile adhesive method should be used whenever possible. If the only practical option is mechanical fixing, screws and washers should be used every 30cm – that is 15 per board.

Can I plaster directly onto Marmox Boards?

Yes! With no priming required either! The surface of the boards contains additives to reduce the porosity and stop the possible formation of ettringite salts which can sometimes occur when a gypsum plaster is applied to a concrete surface. The boards therefore do not need to be primed..

How many boards will I need?

Small boards are 0.6m x 1.25m - that's three quarters of a square metre so you need to divide the area you want by three quarters and that's the number of 'short boards' you require.

From £13.50 inc. VAT
From £11.25 exc. VAT

In Stock

Adding to basket… The item has been added
COVERAGE CALCULATOR
Bulk Discount

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