Performance Solution scenario This Performance Solution scenario has been developed to assist plumbing practitioners in formulating Performance Solutions concerning high rise apartment stacks. This scenario demonstrates the performance design process used when a plumber is seeking to design a single stack system for a 12 storey residential apartment building. It specifically relates to NCC Volume Three, Performance Requirements BP1.2 Design, construction and installation of cold water services, BP2.3 Design, construction and installation of heating services, and CP1.1 Design, construction and installation of sanitary plumbing systems, and CP2.1 Design, construction and installation of sanitary drainage systems. It is recommended that this is read in conjunction with the Performance Solution Process document.