ETFE Air Cushion
ETFE foil roofs can be supplied as a single layer membrane supported by a cable net system or commonly a series of pneumatic cushions made up of between two and five layers of ETFE foil. The ETFE thin foils are used to form either a single layer membrane or multi-layer cushions supported in an aluminium perimeter extrusion which, in turn, is supported by the main building frame.
In the case of the ETFE cushions, they are kept continually pressurised by a small inflation unit which maintains the pressure at approx. 220 Pa and gives the foil a structural stability and the roof some insulation properties.