Menu
Menu
Your Cart

50mm Marmox Multiboard Waterproof Insulation Board (pack of 2) - 1200mm x 600mm

50mm Marmox Multiboard Waterproof Insulation Board (pack of 2) - 1200mm x 600mm
50mm Marmox Multiboard Waterproof Insulation Board (pack of 2) - 1200mm x 600mm
50mm Marmox Multiboard Waterproof Insulation Board (pack of 2) - 1200mm x 600mm
50mm Marmox Multiboard Waterproof Insulation Board (pack of 2) - 1200mm x 600mm
50mm Marmox Multiboard Waterproof Insulation Board (pack of 2) - 1200mm x 600mm
50mm Marmox Multiboard Waterproof Insulation Board (pack of 2) - 1200mm x 600mm
50mm Marmox Multiboard Waterproof Insulation Board (pack of 2) - 1200mm x 600mm
Price: £30.26 (£36.31 inc VAT)
Price per m2: £21.01/m2 (£25.22 inc VAT)
  • Product Code: A1-1223
  • Delivery Time: 2 - 4 days
  • Brand: Marmox
  • (Tech. support: : 01634835290)
  • Model and Size: 1200mm x 600mm - 1.44m2
  • Weight: 8.06kg
Our ratings on 09-10-2025:
Google My Business Reviews
4.8 out of 5
Show other thicknesses

50mm Marmox Multiboard Waterproof Insulation Board (pack of 2) - 1200mm x 600mm

Width: 600mm
Length: 1200mm
Density: 112kg/m3
Weight/m2: 5.6kg
Weight: 8.06kg
Thermal Conductivity: 0.034W/mK
R-Value: 1.53m2K/W
Compressive Strength: 450kPa

50mm Marmox Multiboard Waterproof Insulation Board is a highly versatile, BBA-certified construction board designed for a multitude of applications, combining superior water resistance, thermal insulation, and structural strength. Manufactured from XPS (extruded polystyrene) foam, which is then reinforced with a polymer cement mortar coating and fibreglass mesh for stability and strength. The XPS core provides effective thermal insulation with a conductivity of 0.034 W/mK. Boards 10mm and above are excellent for insulating walls, floors, and ceilings to reduce heat transfer and improve energy efficiency. Thinner boards (4mm and 6mm) still offer thermal benefits, especially when used with underfloor heating systems to minimise running costs.

   

The Multiboard is completely impermeable to water, making it an ideal choice for use in moisture-prone areas like kitchens, bathrooms, wetrooms, and even swimming pools. It serves as a reliable waterproof tile backer board. The unique, patented surface is robust, providing an effective decoupling membrane to prevent tiles and grout from cracking due to horizontal movement in the subfloor. It allows for the secure fixing of heavy tiles to walls. The boards are lightweight and easy to cut with minimal dust. They can be tiled, plastered, or rendered, and are certified for both internal and external use, including exterior cladding.

CHARACTERISTICS

  • Combines water resistance, thermal insulation, and structural strength.
  • Made from an XPS (Extruded Polystyrene) foam core, coated with polymer cement mortar and reinforced with fibreglass mesh.
  • Highly effective thermal insulation with a conductivity (λ) of 0.034 W/mK.
  • Completely impermeable to water, making it ideal for wet areas like bathrooms, kitchens, and wetrooms.
  • Acts as an effective decoupling membrane to prevent tiles and grout from cracking due to substrate movement.
  • High compressive strength of 400 kPa.
  • Can be tiled, plastered, or rendered, both for interior and exterior applications.
  • Lightweight and easy to cut with minimal dust.

APPLICATION

  • Suitable for insulating walls, floors, and ceilings; use with underfloor heating systems; constructing partition walls; and external cladding.

INSTALLATION

   
   
   

CERITIFICATION

  • Conformity with relevant EU standards, specifically:
    • EN 13164: Relevant to its use as a thermal insulation product.
    • EN 13501 (Fire Performance): The untiled boards are generally classified as Euroclass E./li>
  • Marmox's manufacturing process is associated with ISO 9001 standards for quality management.
  • BBA Certificate: 09/4687
Brand: Marmox Model and Size: 1500mm x 1000mm - 1.5m2
Delivery Time: 1-3 working days
Marmox Showerlay Plinth is a polystyrene block that enables you to cut out the sections to allow the waste and pipes to lay. The Showerlay Plinth can be used wherever it is difficult to run your pipe work, whether it's an awkwardly placed joist or a concrete floor that you don't want to dig out..
Get Best Price
Brand: Marmox Model and Size: Minilay Point Drain Kit with 360 waste
Delivery Time: 1-3 working days
Marmox Minilay Point Drain Kit with a 360 Swivel Waste transforms any concrete floor into a tileable wetroom floor. Marmox Minilay Point drain comes set into a rigid board with a waterproof fleece, allowing for the shower floor to be continued with screed, providing a seamless waterproof juncti..
£71.27
£85.52 inc VAT
Add to Cart
Brand: Marmox Model and Size: 36mm - 100nos
Delivery Time: 2 - 3 working days
36mm Marmox Metal Washers used for fixing Marmox Multiboard is used for fixing Marmox Multiboard, when used with appropriate corrosion resistant screws, these washers grip tightly and become virtually flush with the surface. The diameter of the hole in the Marmox metal washer is 6mm wide. Sold in ba..
£13.50
£16.20 inc VAT
Add to Cart
Brand: Marmox Model and Size: Minilay Linear Drain Kit with 360 waste
Delivery Time: 1-3 working days
Marmox Minilay Linear Drain Kit with a 360 Swivel Waste transforms any concrete floor into a tileable wetroom floor. The drain is 600mm in length and can be covered with 4 different types stainless steel grates (bought separately). The 360 Swivel Waste can be rotated to accommodate horizontal o..
£63.35
£76.02 inc VAT
Add to Cart
Brand: Marmox Model and Size: Bathroom Chair - 1000mm
Delivery Time: 1-3 working days
Marmox Bathroom Chair is a pre-assembled comfortable completely water proof bench made from high density XPS that can be used in any wet area, such as showers, steam rooms, swimming pools, etc., as well as external use in a garden or commercial setting. It comes in one metre length, and can be ..
£296.70
£356.04 inc VAT
Add to Cart
Brand: Marmox Model and Size: 36mm - 500nos
Delivery Time: 2 - 3 working days
36mm Marmox Metal Washers used for fixing Marmox Multiboard is used for fixing Marmox Multiboard, when used with appropriate corrosion resistant screws, these washers grip tightly and become virtually flush with the surface. The diameter of the hole in the Marmox metal washer is 6mm wide. ..
£36.80
£44.16 inc VAT
Add to Cart

Related Products

Brand: Marmox Model and Size: Wall brackets - 2nos
Delivery Time: 1-3 working days
Marmox Wall Brackets are robust galvanised metal brackets for securely fixing Marmox Multiboards to adjoining walls at 90° angles.2 brackets per packD..
£3.48
£4.18 inc VAT
Add to Cart
Brand: Marmox Model and Size: 50mm x 20m roll
Delivery Time: 1-3 working days
50mm Marmox Reinforcing Tape is a elf-adhesive fibreglass tape for reinforcing joints between Marmox Multiboards prior to plastering.CHARACTERISTICSGl..
£1.76
£2.11 inc VAT
Add to Cart
This product is listed in the following categories and systems (click to show).