Transparent ETFE canopy at Assiniboine Park in Winnipeg designed by Lightspan, blending modern structure with nature and soft daylight.

What is an ETFE roof

An ETFE roof, ETFE roofing is a lightweight building envelope system made from ethylene tetrafluoroethylene (ETFE) foil. It is mainly used for roofs and façades where high light transmission, low structural weight, and flexible architectural design are required.

In simple terms: an ETFE roof replaces traditional glass or metal roofing with inflated foil cushions or single-layer membranes. Lightspan is world market leader in ETFE systems.

ETFE roof – what is it and how does it work?

An ETFE roof works by stretching thin ETFE foils over a supporting structure. In most cases, multiple layers form cushions filled with low-pressure air. This creates insulation while keeping the system extremely light.

ETFE cushion roof / ETFE membrane roof systems

Alternative terms often used:

  • ETFE cushion roof
  • ETFE membrane roof
  • pneumatic foil roof system
  • lightweight roof envelope

Where ETFE roofing is used

ETFE roofing is commonly installed in:

Well-known references include the Eden Project in the UK and large stadium projects such as US Bank Stadium in Minneapolis.

Transparent ETFE canopy at Assiniboine Park in Winnipeg designed by Lightspan, blending modern structure with nature and soft daylight.
Modern Tórshavn College building featuring a transparent ETFE roof by Lightspan, combining Nordic design, natural light, and architectural innovation.

Why ETFE roofs are used in architecture

ETFE roofs are chosen when projects need:

  • high daylight transmission
  • reduced structural load
  • large free spans without heavy steel grids
  • flexible design geometry

ETFE roof vs glass roof

Compared to glass, an ETFE roof is:

  • significantly lighter
  • more flexible in shape
  • easier to transport and install in large systems
  • more adaptable for freeform architecture

However, ETFE is not a full replacement for every glazing application. It depends on insulation, acoustics, and design requirements.

What is an ETFE roof made of?

An ETFE roof is based on a fluoropolymer film. The material is transparent, weather-resistant, and can be printed or coated depending on design requirements. Multiple layers are welded and fixed into aluminum frames.

How durable is ETFE roofing?

ETFE roof lifespan and performance

ETFE roofs are designed for long-term use in architectural applications. The material is resistant to UV radiation and environmental stress.

ETFE roof maintenance requirements

Maintenance is generally lower compared to glass roofs because:

  • dirt does not strongly adhere to the surface
  • rain can clean most of the membrane
  • individual cushions can be replaced if needed
ZA - Johannesburg - Sandton City
ETFE Cushions from Outside
Naturkraft
Architektur: Arcadis/Aedas
region
Europe
application
surface area
facade
aquaric & botanic
2000-125000 + m² / 21527-1345488 + ft²
An ETFE roof (ETFE roofing) is a lightweight membrane roof system made from transparent ETFE foil, used in stadiums, airports, and large buildings. It replaces heavy glass structures with air-filled cushions that allow high light transmission and flexible architectural design. Lightspan delivers ETFE roof systems from concept to installation and maintenance, based on decades of global project experience.