This European Standard specifies requirements for roof lights made of plastic materials (e.g. GF-UP, PC, PMMA, PVC) with and without upstands made of e.g. GF-UP, PVC, steel, aluminium or wood for installation in roofs. These roof lights serve the purpose of lighting by means of daylight and of ventilating interior spaces by means of opening devices. This European Standard applies to roof lights with a rectangular or circular ground plan (see Figures 1 and 2), with an opening span (width) or diameter not larger than 2,5 m and an opening length not larger than 3,0 m in roof pitches up to 25°. This document does not cover roof lights which contribute to the load-bearing or stiffness of the roof itself. This European Standard applies to roof lights without upstand and to roof lights, where a single manufacturer provides all components of the roof light with upstand, which are bought in a single purchase. The possible additional functions of smoke and heat ventilation in case of fire, and/or roof access, are outside the scope of this European Standard. This European Standard does not include calculation with regard to construction, design requirements and installation techniques. NOTE Guidelines for safety, application, use and maintenance of individual roof lights are presented in Annex A.