ThermoSphere Timber Insulation Board can help lower your running costs by as much as 50% and can pay for themselves in as little as 2.5 years They are produced from extruded polystyrene, faced on both sides with a fibreglass mesh embedded into a thin cement polymer mortar. The boards are available in a range of different thicknesses. When used in conjunction with underfloor heating they prevent the heat from penetrating down into the substrate below. When used as a tile backer board tiles can be fixed directly onto the surface without prior preparation. They are ideal for use in wet rooms such as bathrooms as they are waterproof. Benefits of the thermosphere Insulation Board, Heat up times can be reduced considerably, High compressive strength and waterproofing properties High grab factor improves tile adhesion.