Aluminium Base Bar with PVCu Cap and End Cap Strong extruded aluminium Base Bar with durable PVCu Cap and decorative End Cap complete timber rafter main bar for 10 16 and 25mm polycarbonate. Part of Sunwoods high quality maintenancefree SnapTight range of rafter bars. The extruded aluminium Base Bars feature a central recess with locking points into which the toothed legs of the PVCu Cap are located and longlasting EPDM rubber gaskets to cushion and form a weathertight seal on the underside of the polycarbonate. The PVCu Cap has coextruded seals that forms a sound pressure seal on the top of the polycarbonate once the PVCu Cap has been pressed firmly into position. Retrofitted to existing timber roofs with 10 16 or 25mm polycarbonate the 25GB Rafter Main Bar and other Sunwood components can encase and seal problem leak areas while also breathing a new lease of life into the roof. Sunwood is equally effective on new installations too offering an attractive low...