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The Thermo-loc Platinum Multi Cavity Closer eliminates damp and cold bridging around doors, windows, and sills. It addresses issues like closing cavities at external doors, window jambs, and sills, while providing thermal insulation to combat cold bridging. Suitable for cavities between 50mm to 100mm and 100mm to 150mm, it features a rigid uPVC profile with Platinum expanded polystyrene insulation with thermal conductivity of 0.031W/mk. This product comes in 2.4m lengths for easy installation. It complies with Building Regulation Approved Documents C, L1, and L2, and meets BRE, British Standards, and NHBC standards. Provides a reliable DPC and thermal barrier.. Timloc 2.4m Thermo-loc Platinum Multi 50mm to 100mm Cavity Closer - Pack of 10 Extruded uPVC