Other Membranes
PTFE (polytetrafluoroethylene) coated glass fibre membranes are the most common non-combustible membrane and are typically available in white only. They are sandy beige at time of install, but soon bleach to white. As glass is inherently much stronger than steel in a direct weight to tensile strength comparison, glass fibre roof systems are much lighter than traditional roof structures. This results in less support framing, greater spans, fewer structural members meaning a ‘greener’ building (less embodied energy) and less cost. PTFE, otherwise known as Teflon©, is one of the toughest compounds known to man.
Silicone coated glass fibre membranes are not so common, but are emerging as an attractive option where non-combustibility is a must. They have the additional benefit of high translucency (up to 40% light transmission) and low toxicity (in fire situations). Silicone coated glass textiles are arguably more environmentally friendly than their PTFE coated cousins, being considered chemically inert and non-toxic, even at high temperatures.
ETFE (ethylene-tetrafluoroethylene) is an incredibly flexible polymer, offering excellent properties such as transparency, self cleaning and durability. Most commonly used in double or triple layer air inflated pillows it provides excellent thermal and solar control. It is also important to note this is one of the most sustainable building materials available. One high profile ETFE project is the Watercube in Beijing.