Green roof?

Joined
6 May 2016
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United Kingdom
I've been hearing a lot about green roofs lately.
How do they work? What is the life expectancy? How expensive are they when compared to more conventional roofing systems? Do they require maintenance?
 
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essentially it's a normal flat roof covering with plants and growing medium on top. The life expectancy will be that of the chosen roof covering plus maybe a bit due to lack of UV degredation. they are generally far more expensive as you have the roof covering and then the vegetation. Maintenance and costs will vary depending on your chosen topcoat. For example a lawn would require mowing, but a wild flower meadow wouldn't. Some might require watering in dry weather. your choice will also have a cost factor too. For example the aforementioned lawn would only require simple soil for the grass, but other plants might require special medium for the plants. Some types might require water retention systems as the plants cant tolerate fluctuations in condidtions
 

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