uPVC 250mm Replacement Fascia Board (23mm Bullnose Edge) 5m - White Dimensions Length: 5m. Width: 250mm. Thickness: 23mm. Leg: 35mm overall. Material: uPVC. Guarantee: 20 years. Description The magnum xtra square leg fascia system is a clean, modern style which includes an extra thick 25mm fascia board and a full range of accessories to ensure a neat and professional installation. The magnum xtra square leg fascia system comes in a wide range of fascia widths.