Abstract: A sports stadium or building complex is covered by a huge fiberglass fabric dome that is supported by an inflatable dual-membrane bladder on a hollow compression ring with a diameter of 800 to 1200 feet. A central vertical spreader having upper and lower tension rings connected to the membranes of said bladder is supported from above or below by separate suspension cables in a position above the compression ring. Containment cables limit the expansion of and shape said bladder to provide a closed pressurized air space of narrow lenticular cross section and can include 40 or more radial ceiling cables and the same number of radial hold-down cables of the same length.