Board Calculator Calculate = Add to Basket config = { calculator: 'board-cal', label: 'boards', coverage: 0.75, //simples: simpleqtys, //simple Trig: $j ('.super-attribute-select') }; board Cal.init (config); Warmup® insulation board is a water resistant, insulated tile backer board made from extruded polystyrene, faced on both sides with a fibreglass mesh embedded into a thin cement polymer mortar. The board is designed to withstand a load of 30 tonnes per square metre & is ideal to be used with underfloor heating as it prevents the heat from penetrating down into the substrate below. As a wall tile backer board, tiles can be fixed directly onto the surface without prior preparation &, being totally waterproof, is suitable for bathrooms or showers. In testing, heat-up time was cut from over 2 & a half hours to just 20 minutes. This data applies to Warmup heating products only.