Celotex is a leading UK manufacturer of PIR (polyisocyanurate) thermal insulation products, and part of the Saint-Gobain group. Their range boasts excellent thermal performance with lambda values of 0.022W/mK. This level of efficiency means that the thickness of insulation needed to hit the required U-value is reduced, thereby optimising space in construction design. We stock the Celotex GA4000, XR4000, and PL4000 thermal laminate as well as a selection of their high-performance PIR insulation board.