A properly installed and maintained green roof should extend the life of the roof 2 3 times its normal life.
Green roof lifespan.
Irrigation wastes water and energy both are what the green roof should be conserving.
In europe where they have been building with green roofs since the 1960s green roofs have been known to last for from 30 to 50 years.
How long will my roof last with a green roof.
Green roofing can extend the lifespan of a roof by over 200 by covering the waterproofing membrane with growing medium and vegetation this shields the membrane from ultra violet radiation and physical damage.
By protecting the roof membrane however a green roof can extend the life of a roof by two or three times beyond its typical lifespan.