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Description British Gypsum Gyproc Wallboard Duplex is equipped with a foil layer on the back, effectively halting condensation buildup in external walls and roof spaces. Condensation typically occurs where warm air meets cold surfaces, leading to dampness and mold growth, which can compromise structural integrity and damage materials. British Gypsum Gyproc Wallboard Duplex acts as a preventive measure, ensuring enhanced stability for structures and promoting healthier indoor environments by curbing condensation-related issues. Features & Benefits Use it to control condensation risk Made of a gypsum core between paper liners The board's vapour control membrane is made from metallised polyester