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The Thermo-loc Platinum Multi Cavity Closer effectively eliminates damp and cold bridging around doors, windows, and sills. It closes cavities at external doors, window jambs, and sills, providing crucial thermal insulation to combat 'cold bridging'. Suitable for cavities from 50mm to 150mm, it features a rigid uPVC profile with Platinum expanded polystyrene insulation with thermal conductivity of 0.031W/mk. Measuring 2.4m in length, it's easy to install and meets Building Regulation Approved Documents C, L1, and L2, BRE's 'Thermal insulation: avoiding risks', British Standards, and NHBC standards. It offers a reliable DPC and thermal barrier between frame, and inner and outer constructions.. Timloc 2.4m Thermo-loc Platinum Multi 100mm to 150mm Cavity Closer - Pack of 10 Extruded uPVC