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What You Need to Know About Fascia and Soffit Replacement in the UK Fascia boards bridge the gap between your wall and your roof. They support the lower row of roof tiles and also carry guttering. They also prevent the rot and moisture from damaging the roof and walls around it. Soffits should have ventilation systems fitted to allow air flow into the attic space. This will reduce the risk of condensation in the house, which could result in damp and mould. uPVC uPVC is the most commonly used