Celotex PIR boards come in three different ranges depending on the thickness. 12mm-45mm fall into the TB4000 range, 50mm - 10mm fall into the GA4000 range and 110mm to 200mm fall into the XR4000 range. They are all multi-purpose insulation boards developed to provide simple solutions for overcoming localised thermal bridges. The thermal board is a universal high performance insulation that can be used for pitched roofs, flat roofs, timber frame walls, floors, room-in-the-roof applications and ceilings. It is suitable for both new build and renovations and comes in a wide range of sizes from 12mm all the way up to 200mm. With low emissivity foil facings these thermal boards are manufactured from rigid polyisocyanurate (PIR) using a blowing agent that has zero ozone depletion potential (zero ODP) and low global warming potential (GWP). For any tips or assistance using this product please call one of our sales team directly today. Please note the Celotex FI5000 - Floor Insulation 2400mm x 1200mm x 75mm is now discontinued . The Celotex General Application Board GA4080 2400mm x 1200mm x 80mm can be used as an alternative.