This British Standard specifies requirements for cast and extruded aluminium rainwater systems for use on buildings. It covers extruded aluminium rainwater pipes sized between DN 65 and DN 100. It specifies the materials, dimensions, tolerances, mechanical properties, surface conditions, coatings, jointing methods, fixings and marking for the following components of the rainwater systems: gutters, including half round, beaded half round, beaded deep half round, Victorian ogee and moulded ogee gutters, fittings and accessories used for assembly or support; rainwater pipes, fittings and accessories used for assembly or support.