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The Trisomet® roof and wall system from Tata Steel is an insulated panel system comprising a Colorcoat® pre-finished steel liner profile, a polyisocyanurate (PIR) insulation core and a trapezoidal Colorcoat® pre-finished steel external weathering profile. The PIR insulation core uses the latest foam technology providing enhanced environmental benefits, together with fire performance approved by Loss Prevention Certification Board (LPCB) [8] and Factory Mutual (FM) Approvals [9]. This robust, one component, factory controlled, made to measure panel system has a straightforward side lapping detail which allows faster installation. It also eliminates the risk of interstitial condensation and ensures uniform thermal performance throughout the building envelope. The water tightness of the installed product has been tested in accordance with EN 12865 [10] and makes use of mastic seals to protect the side and end laps, as well as at the cladding perimeters and openings. Foam profile fillers are also used at junctions such as ridges and corners, and at openings.