PRODUCT IS DISCONTINUED - PLEASE CONTACT US TO DISCUSS ALTERNATIVES Celotex Crown-Up is a brand new product for use in flat roofing systems. Representing the next phase of Celotex innovation, Crown-Up is a high performance rigid polyisocyanurate (PIR) insulation which delivers excellent dimensional stability and added robustness in a built-up flat roofing system. Crown-Up has a low lambda range between 0.025 - 0.027W/mK offering high thermal performance. Crown-Up is suitable for built-up flat roofing systems including bituminous based and mastic asphalt applications. Crown-Up is secured to the deck with fully bonded systems or mechanical or thermally broken fastners and is suitable to be used on fully sealed metal, timber and concrete decks. To find out more about this item or any other products in our range please speak to a member of our experienced sales team today..