ProWarm BACKER-PRO insulation boards offer superior waterproofing and heat insulation for underfloor heating and tile applications. These high-quality extruded polystyrene panels, reinforced with fiberglass mesh on both sides, complement our under tile heating cables and mats (not suitable for underwood systems) . Key Features: Superior Waterproof Surface: Provides a durable, waterproof foundation for securely fixing wall or floor tiles, ensuring long-lasting performance and protection against moisture. Outstanding Heat Insulation: With excellent thermal conductivity (0.033 W/mK) , these boards enhance underfloor heating system efficiency, reducing heat-up time and minimizing running costs for optimal comfort and energy savings. Wide Range of Thickness Options: Available in 6mm, 10mm, 12.5mm, 20mm, 30mm, and 50mm thicknesses, offering versatility to accommodate various installation requirements and insulation needs. Approved by Tile Adhesive Manufacturer Instarmac -Ultra: Rigorously