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Celotex XR4120 is a highly versatile PIR board from Celotex. This multi-purpose rigid insulation board is ideal for a variety of applications. This includes solid floors, pitched roofs, flat roofs, masonry walls and steel framed and timber framed systems. 120mm Celotex is easy to handle and boasts excellent thermal qualities. This is a reason why the XR4120 120mm Celotex PIR board is so popular. Celotex XR4120 forms part of the XR4000 range. The Celotex brand is a part of the Saint-Gobain family. Saint-Gobain is a leading manufacturer of insulation boards. The Celotex XR4000 range is at the very core of the Celotex product range. This makes the XR4120 (120mm Celotex) variation a leading choice in construction projects.