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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 roof. They help support the lower row of roof tiles and carry your guttering. They also stop moisture and rot damaging the roof or surrounding walls. Soffits must have ventilation systems installed to allow air flow into the attic space. This will reduce the likelihood of condensation, which can cause damp and mould in the home. uPVC uPVC is the most common material for fascias, s