Green infrastructure, incorporating green roofs and Sustainable urban drainage schemes enhances biodiversity

Green infrastructure, incorporating green roofs and Sustainable urban drainage schemes enhances biodiversity as well as optimising the aesthetic potential of green spaces through linkage; helping to achieve sustainability and lowering CO2 emissions over time; with greater net benefits for wildlife and urban environments than the ad hoc addition of individual components on their own.
So, what exactly is green infrastructure?
Green Infrastructure includes these components; green roofs, sustainable urban drainage schemes (SUDS), garden trees, wildflower meadow creation and enhancement, wildlife habitat creation, ecological enhancement, biodiversity action plans, linking of green space, urban woodlands, street trees, urban parks and public open spaces. The combined benefits of green roofs, Sustainable urban drainage schemes, rainwater harvesting schemes, biodiversity action plans and green space allocation and the ethos of linkage of all these components, through sustainable ecological “green” design is currently being encouraged in landscape planning.
More benefits?
Green infrastructure helps to aid biodiversity, increases energy efficiency in buildings and decreases storm water runoff, minimising peak water flows.
Therefore, using green roofs (and also green walls), maximises habitat creation potential, with wildlife benefits in built up urban areas, whilst minimising & slowing down storm water runoff from buildings, aiding flood alleviation schemes. They cool buildings in hot weather with less need for air conditioning and trap dust and other pollutants, improving air quality & lowering temperatures in “urban heat islands”.
What angles allow a safe green roof to be installed?
If the angle of the roof is between 2 and 20 degrees then you should be able to install a simple green roof. When angles of less than 2 degrees or greater than 20 degrees are involved, more complex design considerations will need to be taken into account. The installation of green roofs on angles of more than 30 degrees is not recommended, unless you have specialist advice available to you.
Underlying roof structure, will the roof structure of the roof of your shed/garage/house take the extra weight that the green roof will put on it?
A simple, light weight green roof will weigh between 60-150 kg per square metre; calculations must also include the weight of water held in the roof and snow loading. If you are in doubt, you should consult an architect/engineer.
Green Roofs have 5 main layers; planting layer, planting substrate (this should be 80% inorganic and 20% organic compost), filter layer(Light weight geotextile/landscape fabric), drainage layer (especially important for roofs of less than 10 degree angle), and finally a waterproof/ root proof membrane layer.
For details on Flooding go to www.landvision.co.uk . We will be adding a web page shortly on how to install your Green Roof. Alternatively contact us at; charmaine@landvision.co.uk with your query.