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The underfloor insulation is designed to suit our timber floor. The insulation is concealed below the floor boards. The rigid expanded polystyrene insulation boards are suspended between the floor joists and above the ground. The top face of the insulation is just below the floorboards. The solidity of the floor is unaffected by this design. The internal appearance is also unchanged with only the attractive tongued and grooved boards visible inside. Certified by the British Board of Agrement, it is 25mm thick to ensure ample clearance above the ground, which optimizes the performance of the insulation.