The insulating properties of a glass roof are one of the most important parameters for obtaining an energy friendly and sustainable solution. This requires both an efficient thermal break and the correct choice of glass. In the A98, A74 and VRS products Vitral use polyurethanes as thermal break, because polyurethane is both very strong and has very low thermal conductivity. The technological advances in glass have been significant during the last decades. Vitral offers 2 layer low energy and 3 layer ultra low energy insulating glass units with all kinds of solar protection, safety, colors etc. The glass is supplied from the major European glass manufacturers.By making the right choices you can design a glass roof in a way which prevents cold downdrafts in winter and unnecessary solar heating in summer. Vitral use safety glass in all roof lights.Please contact Vitral for advice about your specific project.