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A green roof or living roof is a roof of a building that is partially or completely covered with vegetation and a growing medium, planted over a waterproofing membrane. It may also include additional layers such as a root barrier and drainage and irrigation systems.

What does a green roof do?

Green roof growing media retain rainwater and, together with plants, return a portion of this water to the atmosphere through evaporation and transpiration (evapotranspiration). Stormwater that does leave the roof is delayed and reduced in volume.


The Advantages & Disadvantages of Green Roofs

There are numerous benefits of a green roofing. Some are obvious and others less so.

There are also some disadvantages to a green roof, although these are few and far between.

To help you decide whether a green roof is right for your home or business, let’s look at green roof advantages and disadvantages.

Advantages of Green Roofing Solutions

Sound Insulation Damper

Sound is a huge distraction, especially in a commercial building. Workers don’t want to listen to the rumble of heavy traffic outside their office and if you are at home, no doubt you won’t appreciate the noise from heavy rainfall on your flat roof. A green roof is an extra layer of insulation and will absorb up to 30% of environmental noise pollution. You can get on with working from home or in the office, free from distractions, or sleep more soundly in your bed at night.

Pleasing on the eye

There is no doubt about it: a green roof is visually appealing and, in the case of a public building, guaranteed to attract attention. The days of grey concrete and acres of glass and steel are long gone. People want to look at something natural and green roofs often play a big part in the overall design.

Temperature Control

Nature is extremely efficient at regulating temperatures. Flat roofs, unfortunately, are not. They absorb heat on a hot day and allow valuable heat to escape on a colder day. The addition of green roofing helps to regulate temperature in a building. Your home or commercial building will feel warmer in winter and cooler in summer. This will save you money on heating and air-conditioning costs. 

Air Quality

Built-up  areas are often notable for their lack of vegetation, which leads to a build-up of carbon dioxide and other harmful pollutants. A green roof makes the most of the unused space. Plants absorb pollutants and emit oxygen, improving air quality and thus helping the environment.

Rainwater Retention

Rainwater runoff can be a big problem if your area is prone to heavy downpours and flash floods. Green roofing can absorb a large amount of rainwater, helping to prevent localised flooding and reduce the flow rate to water course.

Buildings Rating

If you are hoping to build a sustainable home or improve the building’s rating with BREEAM, a green roof is an excellent starting point. It’s even better if you choose plants native to your local geographic area then you are sure to find favour with the local planning department to build your dream home.


City centres and urban environments are often inhospitable to birds, insects, and other important creatures. A green roof helps to promote the biodiversity in its surrounding area by attracting wildlife. Extra features such as bird baths, insect stations  and beehives can be added to boost the roof’s ecological impact.

Protect Your Roof

Green roofing installation will protect your roof from UV rays and acidic rain, thus prolonging its natural life.


Disadvantages of Green Roofing Solutions

There are very few disadvantages, but the cost of installation is the main one.

Cost of Green Roofs

A green roof will be more expensive to install than a traditional flat roof, as the underlying structure may have to be strengthened to cope with the extra load. Of course you are adding another system to your waterproof system below however this could in turn increase the longevity of the roof as a whole.

Green roofs offer so many benefits that you definitely should consider an installation in an appropriate area. Once installed, a green roof is beautiful, low maintenance, and eco-friendly.

Kent Roofing Services are pleased to be able to offer our customers the opportunity to have this new, environmentally friendly green roofing system installed.


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