From Recticel
A high performing, resilient PIR insulation board for use in warm flat roofs under built-up felt and single-ply waterproofing systems. Plylok consists of an insulation board bonded to a 6mm plywood top layer and boasts high compression strength, dimensional stability and consistent board sizes. Plylok Technical Data Low thermal conductivity: 0.022 W/mK Range of thicknesses: 56mm - 156mm Compressive strength: exceeds 150kPa at yield Facing: 6mm plywood (top), multi-layer coated aluminium (bottom) Zero ODP and GWP less than 5 ISO 9001 and ISO 14001 Fire performance (insulation board): Class 1 (BS 476, Part 7), Euroclass F (BS EN 13501-1)