(Minimum Order 50 boards - pallet only delivery - 2/3 days) Styrofoam 18mm Premium Solid Floor Routed Panels Ideal for Water Underfloor Heating 12 mm pipe Each board covers 0.72 sqm (1200mmW x 600mmL x 18mm) The Extruded Polystyrene(XPS) Insulation - is known worldwide for exceptional long-term insulation performance on foundations, walls, roofs, underfloor and more. This insulation board is designed specifically for use with water underfloor heating systems, very high compressive strength (30tonnes / m2), light weight, high efficiency and low cost make this thermal board an ideal choice when fitting heating on to a poorly insulated concrete or screed base and works excellently with water underfloor heating systems. Dimensions The dimensions of each board are 0.72m2 (1200mm x 600mm x 18mm) The boards have 150mm centres.