Green roofs result in extended life expectancy of a roof. Based on 50-plus years of experience with green roofs in Germany where green roofs are common, a green roof can be expected to experience double or triple the life of a standard roof.
How does this work? Green roofs provide protection of the waterproofing membrane from wind-blown debris and shielding from damaging UV radiation which is increasing due to climate change. Green roofs provide impressive insulation from temperature extremes, thereby minimizing damage from daily expansion and contraction.
Because green roofs last longer, they reduce construction waste in landfills because they do not have to be torn down and replaced as often. There is also a cost savings over the lifetime of the building itself.