zanthia's Profile

I guess structural problems are a different matter, but problems caused by water filtration and such are preempted by the protection between the actual soil and the roof. They install a whole lot of layers, including a water-proof one, and another one that is designed to drain away excess water from the soil.
And you don't have to completely cover your roof, you could 'green' the areas that aren't used for maintenance and don't have mechanical equipment.