Roof Gardens: Green and Brown Roofs – The Differences and Benefits

Living roofs are soaring in popularity, both in residential and commercial projects, due not only to their aesthetics, but also the many environmental benefits they bring to the building. You will note if you visit horticultural events such as Chelsea or Hampton Court Flower Shows that most of the show gardens incorporate green roofs in some way, which is always a good indication of future trends. Here is a brief guide, explaining firstly what green roofs and brown roofs are, before detailing their uses and benefits.

Image result for roofing

Green Roofs

Green Roofs are basically roofs which incorporate planting, often sedum or wildflower and meadow planting, grasses and mosses. Actually some can even be planted with trees and shrubs. The Roof Gardens in Kensington is a prime example of this. Installing a green roof creates a vegetated surface which supplies colour and interest throughout every season. Often , living roofs are used in rural settings and in areas where the buildings need to blend into the back ground. Green roofs will either be planted or seeded.

There are of course many considerations before installing a green roof, primarily ensuring your roof is suitable, and ensuring it is completely watertight. It is usually recommended to get a professional company carry out the work, as you might do more harm than good if not done properly.

Of course, living roofs/wildflower and meadow roofs produce a dramatic visual impact, nevertheless they also have many other benefits.

Advantages of Green Roofs

1 . Photosynthesis – the process of plants absorbing carbon dioxide and releasing oxygen. This is of particular benefit in urban areas.

2. Filter pollutants and dust from the surrounding area, again, a huge benefit in towns.

3. Green or living roofs act as an insulating layer on your roof. You ought to therefore expect to spend less on your energy bills, ergo reducing your carbon footprint.

4. Increase in biodiversity – encourage animals such as bees, butterflies and birds into the area. With the current bee crisis, any opportunity to encourage bees into the area is a massive benefit.

5. Living roofs can be fitted with bird boxes to encourage birds, often endangered species, in to the area and give them a safe environment to nest.

six. Endangered plants can be introduced into the roof planting.

7. Green roofs can reduce stormwater runoff significantly, which could help alleviate flooding, yet another very topical issue.

8. Often used as social areas, perhaps on top of office buildings, allowing staff to have somewhere green to flee to in the middle of an urban area. They are also increasingly being installed in public areas, to supply much needed green space in built up areas. A good example of this really is on London’s Cannon Street Station.

Brown Roofs

Brown roofs are very similar to green roofs. The main difference is that whilst green roofs are often installed partly for the aesthetic value, brown roofs tend to be installed for environmental reasons, mainly, to encourage plants and wildlife.

Brown roofs are often made using recycled materials and local soil. Whereas green roofs are often planted using very specific plants and following structured plans, brown roofs evolve more naturally. Whilst they are called brown roofs as here is the colour they are at the time of installation, they generally turn green over a period of time once the plants have started to establish themselves.

Leave a Reply

Your email address will not be published. Required fields are marked *