Board Calculator Calculate = Add to Basket config = { calculator: 'board-cal', label: 'boards', coverage: 0.72, //simples: simpleqtys, //simple Trig: $j ('.super-attribute-select') }; board Cal.init (config); Pro Warm™ BACKER-PRO insulation boards are high quality extruded polystyrene panels, covered with a fibreglass mesh on both sides, for use with our under tile heating cables & mats (not suitable for our underwood systems). Available in 6mm, 10mm, 12.5mm, 20mm, 30mm & 50mm thickness. They are ideal for two primary purposes; as a superior waterproof surface to fix wall or floor tiles & as a first class heat insulation for underfloor heating systems. Pro Warm™ BACKER-PRO insulation boards are particularly suited to underfloor & under tile heating applications. Installation below underfloor heating systems on an existing un-insulated concrete or timber sub-floor will greatly reduce heat up time & running costs. When installing onto concrete sub floor we recommend using our flexible