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California’s wildlife bridge became a target for the right. Now it’s eyeing the finish line (www.theguardian.com)
submitted 4 months ago by to c/solarpunk@slrpnk.net
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[–] 1 point 4 months ago (1 child)

When your comparing a roof load to a bridge load, the bridge live load is going to be significantly higher than an uninhabited roof. A typical bridge in the USA is designed for 640 psf plus a 72,000 lb truck. In contrast, a new roof isn't designed for anything equivalent to that.

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  • [–] 4 points 4 months ago

    Hence me specifying roof-top parks. You know, with lots of waterlogged soil and trees. The static load of that is significantly higher, but of course heavy trucks cause lots of dynamic load, which is another difficult issue.

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