I had heard about the existence of this creature but now here it was right in front of me! What was it? A living roof!
What is a Living Roof?
In simple terms a living roof is a roof that is covered in vegetation. Although this type of roof has been built for thousands of years it has not, up until now, received wide acceptance. Why? Until recently their use has been limited because of the structural requirements needed to support heavy soils and the technical challenge of water-proofing low slope roofs.
There are now new membrane water-proofing technologies and light-weight thin profile green roofs that have made this system practical and advantageous for most construction.
This is the roof of a dwelling that I can see from my hotel balcony. It features many different plants.
Looking the other way I see this one which seems to feature a type of grass.
What Are The Advantages of Green Roofs?
- They keep the dwellings cooler in the summer and warmer in the winter!
- They can be very attractive by giving a natural look to any building.
- They reduce water run-off by retaining half to three quarters it and they slow down the remaining run-off.
- The water that does run-off is cleaner.
- Since the underlying structure is shielded from the sun and temperature swings it lasts much longer!
- These roofs can serve is a refuge for creatures that struggle to survive in urban areas.
How Are Green Roofs Constructed?
Since a green roof can add from between 20-100 pounds per square foot of extra weight they do require more engineering. What lies on top of this are many different layers of material each of which are designed to perform a specific function.
You can see a cross section of this type of roof here.
What types of Plants Can be Used?
Since the plants may need to survive extreme heat, cold, dryness and deluges not any old plant will do. The type of plants that are suitable will, of course, change depending on location.
Here are some sites that list suitable varieties according to location:
Naturally you would need expert advice for your area before implementing a living roof!
How Much Maintenance do They Require?
There is no such thing as a maintenance free roof. During the first year, while the plants are becoming established watering and some weeding is typically required. After the first year, in order for it to be considered a green roof it shouldn't need any watering.
Of course maintenance requirements will change depending on location and the type of plants used.
What do You Think?
- Do you like the look of these roofs?
- Would you like to see them used more often?
- Have you got one?
- Can you show me one that you've seen.
I hope that you enjoyed this article about living roofs!
Until next time,
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