Geiger through his new york based geiger berger associates and manufactured and installed by birdair structures.
The metrodome roof.
The metrodome s air supported roof was designed by the inventor of air supported structures david h.
The first collapse of the teflon and fiberglass fabric dome roof at the metrodome occurred in november 1981 after 10 inches of heavy snow fell.
The metrodome roof 2020.
An air supported structure supported by positive air pressure it required 250 000 ft min 120 m s of air to keep it inflated.
The roof had snow melting ducts to prevent a collapse.
That was before the new stadium offictally opened.
However the roof has collapsed four times due to snow the last in december 2010 causing the vikings game to be postponed and moved.