Building Physics of ETFE-Film Systems

Transparent and translucent ETFE films have been used as a component in architecture since the early 1980’s. As single-layer structure and as multiple layers air inflated structure, applied in roofs, facades or as a whole building envelope, they have a significant influence on the climatic conditions and the comfort of the enclosed space. ETFE foil systems used as building envelope have to meet requirements for winter and summer heat protection as well as moisture protection. It is therefore important to know the building physical properties of the film systems and the influencing factors. Depending on the number and spacing of the individual film layers and the installation situation (horizontal, vertical, inclined), the proportions of heat conduction, heat radiation and convection in these systems change. The film layers are usually double-curved, are neither parallel to one another, nor are all surfaces perpendicular to the solar radiation at the same time.