Abstract
Preface. The Trondheim Division of the Norwegian Building Research Institute has a specialized and trained sta ff. They act as advisers and consultants for manufacturers as well as users of building materials and components. A special feature of the division is the development of specialized test methods and laboratory test equipment. Another important point is the collection of practical experience. The f our papers presented in the present report represent four different aspects of the durability complex. The first paper is giving results of accelerated testing of PVC roofing materials in the NBI special apparatus Mark l and comparing with results from natura! Exposure The second is .correspondingly giving results from testing of wooden windows with organic coatings in apparatus Mark 2, compared with natura! exposure The third is dealing with accelerated testing of glass-fiber reinforced polyester in apparatus Mark l compared with accelerated natura! exposure Finally the fourth is presenting results from lang time practical experience with sealed glazing units, up to 32 years old. Three of the papers were first presented at the "Third Interna tional Conference on the Durability of Materials and Components" in Helsinki 1984, the fourth at "Windows in Building Design and Maintenance" in Gateborg 1984. The combined presenta tion in this report makes it easier to study the four papers and compare. The Royal Norwegian Council for Scientific and Industrial Research (NTNF) has contributed to the printing costs.