This standard specifies the requirements of pipes, fittings and the system of polypropylene (PP) for solid-wall piping systems in the field of soil and waste discharge (low and high temperature) (inside buildings (marked with "B"); and (both inside buildings and buried in ground within the building structure (marked with "BD"). NOTE 1: The application area "inside buildings" according to this standard, applies to the interior area of the building only. The application area "within the building structure" conforms to the requirements for "inside buildings" according to prEN 12056-1.