Insulated tile-backer boards are a high performance, reinforced insulating board. They are made of waterproof extruded polystyrene with a fiberglass mesh embedded on each face into a cement polymer coating for exceptional compressive strength & rigidity.
 
 
The use of insulated tile-backer boards will reduce warm-up times & reduce running costs in all cases, but they are especially recommended if installing under-tile heating on an un-insulated floor.
The boards can be fitted directly over floorboards, chipboard, plywood using galvanized screws & over existing concrete floors with ordinary floor tile adhesive (a rapid setting adhesive is recommended)
In conclusion the boards are 0.72m each & are available in thicknesses of 4-70mm.