606e785e_pes__Advantages__Disadvantages__Advantages
[Roof Type] Eco-roofs [House Style] Flat to moderately sloped roofs. [Disadvantages] initially expensive unconventional in US, though used more than 30 years in Europe [Advantages] 
Environmentally friendly; filters rainwater through a roof system of vegetation and soil Low maintenance; can extend the life of the roof membrane substantially Provides insulation to even out climate variations; in particular, keeps houses cooler in summer Attractive
Roofing Material Comparisons -- Material Types, Advantages, Disadvantages
Advantages