Please note this pack contains 4 x 1200mm x 600mm sheets. Insulation beneath mechanically fixed / fully adhered single“ply waterproofing, and partially bonded built-up felt and mastic asphalt. Properties High performance rigid thermoset insulation “ thermal conductivities as low as 0.024 W/m.K. LPCB approved to LPS 1181: Part 1. FM approved for Class 1 steel deck roof assemblies. Fully compatible with single“ply non“bituminous membranes that are fully bonded with solvent based adhesive systems. Fully compatible with most bitumen based and mastic asphalt waterproofing systems. Compatible with most green roof systems. Resistant to the passage of water vapour. Easy to handle and install. Ideal for new build and refurbishment. Non“deleterious material. Manufactured with a blowing agent that has zero ODP and low GWP.