CB20 20mm Multiboard

If you're looking for innovative ways to enhance the performance of a building, Marmox has the answers. Marmox insulation boards are thin sheet boards designed to insulate the floor surface of new or existing buildings, saving up to 50% of the heat lost with conventional underfloor heating.

What is Marmox Multiboard made of?

This insulated tile backer board is made of extruded polystyrene, reinforced and covered on both sides with a fibreglass mesh embedded into a thin cement polymer mortar. The individual board is 1250mm long X 600mm wide with the optional thickness of 6mm, 10mm or 20mm. It is installed using a flexible tile adhesive in a similar manner to a large tile.


  • Excellent heat insulation
  • Completely water resistant 
  • High compressive strength
  • Excellent acoustic properties
  • Lightweight and easy to work with/install into new and existing building projects.
  • Will not rot or break down
  • Environmentally friendly 
  • Energy saving/energy efficient
  • Retains its R and U value even in moist conditions
  • Acts as a thermal barrier and significantly reduces heat loss to the substrate
  • Transforms undertile heating into a very responsive and efficient system
  • Can replace tile and slate underlay
Product Code: 
600.00 (w) x 1,250.00 (h) x 20.00 (d) mm