ETFE Roof - With the above nature and behavior of ETFE, it is tagged as the most efficient roof material to date. In fact, it is the future of all structural needs. It has a wide variety of applications such as agricultural, industrial, government, hospitality, schools and universities, streets, parks and recreations and many more. Very Lightweight: ETFE comes in foil or film which is very lightweight. This is a good material which only require less steel framework to support its weight. Hence, reducing the cost for the materials. Since it is very light, it also almost does not add any load that may impose stress on a building if it is decided to be built as an addition or an extension. This is why it is considered as roof of the future because of its free-form characteristic.