An ETFE roof combines the transparency of glass with a fraction of its weight. Buitink Technology designs, engineers, manufactures and installs ETFE air cushion roofs: roof systems made of multiple layers of ETFE foil (ethylene tetrafluoroethylene) that are inflated to form insulating, weather-resistant cushions. We also supply ETFE domes, skylights, facades and canopies, and single-layer ETFE structures.

How an ETFE cushion roof system works

An ETFE cushion consists of 2 to 5 layers of ETFE foil, welded together and clamped in an aluminium profile system on a supporting framework. A small air installation keeps the cushions constantly at a low pressure of about 200–300 Pa, which gives the roof its structural stability and insulation. The power consumption of the air installation is only 60–100 W. The number of layers and the profile system determine the insulation value (U-value) of the roof.

From design to installation and maintenance

We carry out the engineering and strength calculations, manufacture the ETFE cushions in our own production facility, and supply and install them together with the air installation, piping and control system. We also inspect, maintain and renovate existing ETFE roofs, including roofs built by others. An example is the roof of CEC De Ganzenhoef in Amsterdam, where storm-damaged cushions were replaced after 14 years of service.

Looking for a single-layer solution without inflation? See our single-layer ETFE roofs and canopies. Technical details can be found under detailing, U-values and sun shading. Below you will find our ETFE cushion projects.

Why ETFE?

• Lightweight: about 1% of the weight of glass, which saves on steel structure and foundations;
• Up to 95% light transmission: transparent, tinted or printed with a pattern;
• Durable: a lifespan of 35+ years, unaffected by UV light and air pollution;
• Self-cleaning: the smooth surface does not hold dirt or algae and is cleaned by the rain;
• Sun shading: printed foil layers, also as an adjustable system that opens and closes like blinds.

Frequently asked questions about ETFE roofs

What is an ETFE roof?

A roof made of ETFE foil instead of glass. It is usually built as air cushions of 2 to 5 inflated foil layers, but single-layer tensioned ETFE is also possible for large spans.

How long does an ETFE roof last?

ETFE foil has a lifespan of more than 35 years. It is not affected by UV light and cleans itself in the rain, so maintenance and inspection are minimal.

Does an ETFE cushion roof need power?

Yes, a small air installation keeps the cushions at a pressure of about 200–300 Pa. It uses only 60–100 W.

What is the U-value of an ETFE roof?

That depends on the number of foil layers and the profile system. Our U-value page gives calculated values for different configurations.

Can you repair or maintain an existing ETFE roof?

Yes, also roofs built by others. We inspect ETFE roofs, replace damaged cushions and maintain the air installation.