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Message: [QUOTE="xc84, post: 1659262, member: 1526"] Those cables do not support the roof. As you say, it holds the roof fabric together and provides structure to e.g. hang the scorebard. The roof (and its cables) is supported by air. In order to add a non-air-supported roof ("lightweight" or not), significant structure will need to be built around the dome... whether it is giant masts like those created for BC Place or walls that can support the roof load or some other support that works in our climate and for the chosen material. That support is where most of the money will be spent. That's the $200M. The current walls are not built to support a roof (at least not for long). Once the support is there, for ETFE, it will require roof trusses too (besides structure to actually support the trusses). [IMG]http://finance-commerce.com/files/2014/04/StadiumCapture-Football-1280-600x330.jpg[/IMG] [/QUOTE]