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Our premium roof insulation is 100mm thick polyurethane foam with reflective silver alloy laminate facings on both sides. It is certified by the British Board of Agrement. The roof insulation is laid over the roof boards and below the roof covering. This ensures that the internal appearance is unchanged with attractive tongued and grooved boards. No internal lining boards are required. The kit features rigid foam boards which are lightweight and easy to install. Additional decking boards are supplied which are laid over the insulation to provide a suitable surface for fixing cedar shingles, granular steel tiles or EPDM rubber. Detailed instructions are supplied.