The answer should be right here.
http://www.vikings.com/news/article...ear-Roof/dff31d45-bc82-41ec-b768-2ef03827bbe7
What is ETFE?
ETFE is a co-polymer resin that is extruded into a thin film. The plastic-like material is transparent but can be treated to be translucent, is extremely light-weight, very durable and resistant to corrosion. In an architectural application ETFE is typically used in a multi-layer pneumatic system.
What is the life/longevity of ETFE?
ETFE does not degrade with exposure to UV light, atmospheric pollution, harsh chemicals or extreme temperatures. The material has withstood extensive testing within extreme environments, and is expected to have a 30-50 year life expectancy while requiring minimal maintenance. The true life-cycle of ETFE is not known as the oldest applications are just hitting the 30-year mark with little to no replacement of system components.
How does ETFE handle weight/pressure?
Despite its weight (1/100 the weight of glass) ETFE handles snow/wind loads very well. In sheet form, it can stretch three times its length without losing elasticity.
How do you clean ETFE?
ETFE systems are extremely low maintenance. The surface of the foil is non-stick and non-porous, which allows the natural action of rain to clean the surface. Deposits of dirt, dust and debris remain unattached and are washed away in the rain, meaning ETFE effectively self-cleans with virtually no need to clean externally.
Personally I still think the best solution would be something along these lines in the inner harbor, which were both built for less than $500M.
Friends Arena, Sweden's
national stadium for football, is a
retractable roof multi-purpose stadium located next to the lake
Råstasjön in
Solna, just north of
Stockholm City Centre. The main tenants of the stadium are Sweden's
national football team and
Allsvenskan football club
AIK. Both relocated from their previous home at the
Råsunda Stadium. The venue has a total capacity of 65,000 at concerts and 50,000 seated at football matches, but the stadium can be scaled down to accomplish a more intimate setting to host smaller events with a capacity of approximately 20,000 guests. Friends Arena is the
biggest football stadium, and indoor venue, in the
Nordic countries.
Or
Stade Pierre-Mauroy has two floors or main levels. The full stadium level or
Grand Stade reaches a height of 31 m (101 feet) and has a total capacity of 50,186 seats including 4,965 business seats, 1,842 luxury-box seats, 448 protocol seats and 326 reserved for the press.
The stadium has also a particularity: half of the
Grand Stade field is situated on hydraulics lift and massive tracks that raise and slide it above the other half of the field in three hours. This exposes a second lower level floor plan and surrounding seats called
Boîte à Spectacles, where basketball, tennis or music shows can take place. The
Boîte à Spectacles can be configured to have a variable capacity, from 6,900 to 30,000 seats. In November 2014, it hosted the
2014 Davis Cup finals between France and Switzerland, where an attendance record was broken for the highest ever officially-sanctioned competition tennis match.
In addition, Stade Pierre-Mauroy has a retractable roof which opens and shuts in 15 minutes. The stadium is also recognized as a
HQE Building with its solar panels and two windmills to ensure electrical supplying. The stadium will be fully accessible by highway and metro stations, in addition of 7,000 parking lines.
It will host the final stage of the
FIBA EuroBasket 2015.
SU would be the major tenant - but what an asset.
