The Growing Market for Green Roofs

If all roofs were green, cities could disappear from a bird’s eye view. Green or living roofs (by which I mean a roof laid to grass or wild flowers) are so more than just a talking point. They have a real purpose; greening city landscapes, providing biodiversity, improving air and water quality and reducing sound transfer. They could also be a way to limit the damage of future floodwaters because green roofs can retain 70-80% of summer rainfall in contrast to traditional drainage systems that are unable to cope with the increasing rain water levels. Green roofs store the rainwater in plants and substrate; releasing the water back into the atmosphere through evapotranspiration. I predict we’ll be seeing more green roofs in the future and not just on commercial buildings and garden sheds, but on residential housing too. I’m therefore happy to present Sky Garden – the UK’s leading independent green roof specialist. In the rest of this post they talk about the exciting project’s they’ve worked on (including the roof of a salad factory and Gloucester services) and the different systems they can offer.

All the vegetation in Sky Garden systems are locally grown and use recycled materials where possible. From the organic material and recycled brick in substrate, to the high density recycled polypropylene in our modular trays.

Green Roof Projects

Kanes Foods
Green roof kanes

One of our most exciting projects in recent times is the 6,000m² wildflower green roof on the construction of a new salad factory local to Sky Garden in rural Worcestershire. The building was designed to minimise the impact to the local environment and blend into the surrounding Cotswold Hills. The wildflower meadow on the curved roof contains specifically pre-grown wildflower blanket with species local to the Cotswolds.

British Horse Society
British Horse Society Courtesy of Kier Group copy

The iconic 2200m² sedum blanket system on the roof of the BHS offices just South of Birmingham was for employees to offer guidance on everything you need to know about riding, horse ownership and working in the industry. The ‘doughnut’ shaped building with an ancient oak tree taking centre stage offered many complexities however has since become one of the iconic sedum roofs in Britain.

Gloucester Services
Gloucester-Shoot-04 copy

The service station on the northbound side of the M5 between J11 and J12 was constructed to be different from typical service stations. The 4,000m² state of the art bio-diverse living roof is designed to disguise the new service station as part of rolling Robinswood Hills. The wildflower seed mix was chosen to match the abundant grasses and wildflowers in the area such as the Self Heal, Yellow Rattle and Birdsfoot Trefoil. The roof helps to support and preserve the pollinating insects as well as the heritage of our native British wild flora habitats.

Green Roof Systems

Sky Garden offers a variety of green roof systems to cater for every need. All the vegetation is grown by our experts at our local Gloucestershire nursery. We currently offer four standard green roof systems.

• Sedum Systems – The traditional green roof system can be either a sedum blanket or sedum plug plant green roof system. Sky Garden’s sedum blanket is a pre-grown mat of mature sedum plants compared to the sedum plug plant system being individual sedum plugs planted across the roof.

• Wildflower Systems – Sky Garden’s wildflower system includes a wildflower blanket that is sown with a seed mix of 38 species of wildflowers and grasses to create a vibrant array of colour on your roof.

• Bio-diverse Systems – Sky Garden’s bio-diverse system, also known as a ‘brown roof’ system, mimics the surrounding environment that has been lost due to development in order to reduce the ecological impact as much as possible. Often left to self-seed, the substrate is contoured to allow for a variety of native species to establish.

• Modular Systems – The modular system is made up of pre-formed cells that easily ‘click’ together to create a complete green roof quickly and without fuss. Each recyclable polypropylene tray has build in water retention and includes a filtration layer, growing substrate and sedum plants.

All green roof systems follow a similar template. A protection fleece layer adds an extra layer of defence to the waterproofing layer. Drainage and water retention layers designed specifically for living roofs. This includes a filter fleece layer to prevent blockages to the drainage of excess water. A substrate layer created from recycled brick with organic material allows for nutrient and moisture retentive growing medium. On top of this would be your vegetation layer, whether it’s a pre-grown blanket, seeded or plug planted.

For more info see www.sky-garden.co.uk

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