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Green flat roofs – what are the advantages and disadvantages?

Since we are allowed to build almost any type of roof on our property, we are considering a landscaped flat roof because the modern look is very appealing to us, and landscaping is supposed to have many benefits such as insulation and phase shift. Unfortunately, I can't find much information on the disadvantages. My wife's biggest concern is that vermin and birds will settle in there and we will have constant problems, such as bird droppings on the patio and/or bugs, spiders and wasps in the house. What experiences have you had with using a green roof?

• flat roof
• green roof