BENEFITS

Green roofs provide numerous benefits that are listed and explained below.

There are many different benefits of Green Roofs and below are just some of the best examples.

A green roof will often assist when applying for planning permission as you are not only providing increased insulation levels, cleaner air, retaining storm water, but also offsetting your carbon footprint whilst providing necessary habitats for rare insects and birds. So by having a green roof it will not just save you money when your project has been built, but also help gain the permission to build in the first place.

Planning Permission

A green roof will often assist when applying for planning permission as you are not only providing increased insulation levels, cleaner air, retaining storm water, but also offsetting your carbon footprint whilst providing necessary habitats for rare insects and birds. So by having a green roof it will not just save you money when your project has been built, but also help gain the permission to build in the first place.

Habitat for Rare Wildlife

Green roofs provide a stepping stone for many rare birds endangered by the lack of suitable habitats. They also provide a harmonious and stable home for many rare insects, beetles, spiders and plant species. The green roof is so vital to all species, as it is a rare untouched natural space for a hat full of different species, to live without fear of human intervention destroying their homes. Providing this habitat doesn’t just benefit other species, it also counteracts climate change, and also reverses the urban heat island affect.

Heating Bills

Heating bills can also be reduced by a green roof, with an average saving of around 4 %. When buying a green roof you are making an investment, and will reap in the benefits over time, making back your money. The green roof acts as another insulation layer, keeping the expensive heat in your house.

Air Conditioning Bills

Investigations into the benefits of a green roof on air conditioning, have indicated that the need for air conditioning in summer months can actually be reduced by 6 % and, combined with a 1-2 % reduction of the urban heat island effect. When having a green roof you are saving money on both you air conditioning bills, and your heating bills, keeping hot air in, also in the summer hot air out, and cold air in.

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Storm Water Run Off

Vegetated roofs are able to retain on average 82 % of rainfall compared to 27 % on pure gravel rooftops. Having a green roof stops the rain water hitting the ground all at once, damaging the surroundings. The green roof retains the water, and slowly releases any extra water that the green roof has not used, or has not been evaporated. Having a green roof makes it safer walking past a building when there is a storm, as there will be less water on the ground so that it helps prevent any debris, moving onto the path and becoming a trip hazard.

Thermal Benefits

Investigations into the thermal properties of green roofs have revealed that plants themselves significantly reduce air temperatures, both inside the building and in the immediate environment.Having a green roof reduces the need for summer cooling, i.e. air conditioning. This has a knock on effect on carbon emissions by reducing them, as it stops the use of in house cooling methods, such as air condition unit. Experiments, comparing common flat roofs, painted white roofs and green roofs found that, on average, roof temperatures on dry summer days were lower on a green roof, up to 30 ˚C cooler.

Air quality

Studies have suggested a 37% reduction of sulphur dioxide (that causes acid rain), and a 21% reduction in nitrous acid can be achieved in the air above a green roof. This means the air is safer, and cleaner around your building which is good for not just the air but for yourself.

Roof Life Span

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Vigorous studies have proven that a green roof can increase a roof’s lifespan by up to 3 times. There is a hand full of examples where the green roof has not needed to be replaced for over 100 years! The green roof acts as a shield, protecting the waterproofing from UV rays, frost and ice. This leaves the waterproofing untouched, and makes it last longer. Also the green roof material such as growing medium, and vegetation do not even touch the roof, it is the drainage matt and root barrier that does, which also doesn’t let any roots, growing medium, invertebrates, birds, bees, or insects touch the waterproofing.

 

Sound Insulation

A green roof also acts as a sound insulator. Research shows that a 20 – 100mm dry growing medium could achieve an extra SPL (Sound Pressure Level) attenuation of 10 – 40dB, depending on frequency.

Water Quality

Water is cleaned when passing through a green roof system. Rain water travelling through a green roof system will be filtrated. 60% of cadmium, copper, lead, and approximately 16% of zinc, can be removed from rainwater on passing through a green roof. When the water drains off your house, and hits the surrounding vegetation, it will benefit the different plants as it will be using cleaner water.

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