1.1 This practice covers the minimum requirements for the installation of mechanically attached poly(vinyl chloride) roofing.1.2 For the purpose of this application practice, the structure and deck are assumed to be mechanically sound, able to a This practice covers the minimum requirements for the installation of mechanically attached poly(vinyl chloride) sheet roofing. The procedure includes the setting up of mechanical affixments using bar or strip anchoring systems, or plate or disc anchor