This Code makes recommendations for good practice in the site glazing and fixing of glass for buildings. The Code does not cover patent glazing (see CP 145, Part 1), the glazing of glass units of channel section, glass block walling (see CP 122), glass lens lights in walls or roofs, (precast or cast in situ) or dry glazing systems for aluminium frames (in relation to which the system manufacturer should be consulted when information is required)..