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Green Roofs Can Save Cities Money
(lemmy.world)
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The trouble is that it only really works for new construction, older buildings are not engineered to handle the extra weight on the roof.
Yeah. There was an incident in the university where I studied that the whole roof collapsed. https://hongkongfp.com/2016/06/10/city-university-may-sue-contractor-rooftop-collapse-investigation-report-released/