In some cases a green roof factored into a new building’s design can help you gain planning permission. If green roofs are for an existing building then planning permission for the green roof itself is very rarely needed.
Heating bills can also reduced by a green roof, with an average saving of around 4 %.
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 home for many rare insects, beetles, spiders and plant species.
Storm Water Run Off
Vegetated roofs are able to retain on average 82 % of rainfall compared to 27 % on pure gravel rooftops; and this is even better on roofs with a 2 % slope (up to 87 % retention). (Nicholaus et al. 2005).
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 (Niachou et al. 2001). Experiments in Toronto, Canada, comparing common flat roofs, painted white roofs and green roofs found that, on average, roof temperatures on dry summer days were 65˚C, 42˚C and 35˚C respectively.
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, when compared to other air samples taken nearby (Yok Tan and Sia 2005.)
Roof Life Span
Studies have proven that a green roof can increase a roof’s lifespan by up to 3 times. There are a couple of examples where the green roof has not needed to be replaced for over 100 years! The green roof protects the waterproofing from UV rays, frost and ice.
University of Sheffield research shows that a 20 – 100mm dry growing medium could achieve an extra SPL (Sound Pressure Level) attenuation of 10 – 40dB, depending on frequency.
Air Conditioning Bills
Publications 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; greened cities could see electrical demand come down by 5 % (Booth 2006).
Water is cleaned when passing through a green roof system. Kohler and Schmidt (1990) found that 60% of cadmium, copper and lead, and approximately 16% of zinc, can be removed from rainwater on passing through a green roof.
Green Roof Types
Our Sedum blanket systems incorporate pre-grown Sedum plant species onto ‘blankets’ or ‘mats’ in roll sizes of 1m x 1.5m. The blankets are established over a minimum of 12 months and include 14 U.K. native species at over 90% coverage. They are produced in coastal locations where many species are naturally found. This makes our plants hardened to harsh and saline conditions, ensuring a robust product for rooftop environments. Eco Green Roof mats are easily installed and provide instant greening for immediate visual impact.
Sedum seeded roofs are systems that have been sown with seeds from Sedum plant species. Our Sedum seeded systems have an application rate of approximately 0.5g/sqm and we use seed mixes that contain a broad range of Sedum species. With the right growing conditions and maintenance schedule these roofs will take 12-24 months to develop.
Sedum plug-planted systems use young plant material (small seedling plugs) planted at a density of 20-25 plants/sqm. A broad range of Sedum species are available to increase the diversity of the system and provide more floristic interest. These types of roofs are immature and will therefore take around 12 months to establish with the correct maintenance (see maintenance section).
Wildflower blanket systems provide more diverse plant communities than Sedum green roofs. They are particularly favored when ecological, aesthetic and environmental function needs to be considered. Blankets are pre-established for a minimum of 12 months and include up to 50 U.K. native wildflower, herb and grass species. Eco Green Roof wildflower mats are easily installed and provide instant greening for immediate visual impact.
Wildflower seeded roofs are systems that have been sown with seeds from a wide range of wildflower species. We use an application rate of approximately 5g/sqm and source seed mixes that contain a broad range of annual wildflowers and herbs to maintain flowering diversity and seasonal interest. Additional species can be added to further increase diversity for both ecological and environmental function if desired. With the right growing conditions and maintenance schedule these roofs will take 12-24 months to develop.
Wildflower plug-planted systems use young plant material (small seedling plugs) planted at a density of 20-25 plants/sqm. Broad ranges of wildflower species are available to maximize the diversity of the system and provide floristic interest both for aesthetical and ecological reasons. These types of roofs are immature and will therefore take around 12 months to establish with the correct maintenance (see maintenance section).
Bio-diverse / Brown Roofs
Bio-diverse or Brown roof systems are specifically designed for biodiversity by offering a broad range of annual and perennial wildflower and grass species, and providing a mosaic of habitat opportunities for important invertebrate and bird species. In particular these roofs are created for species important to the site or regional bio-diversity plan; and incorporate several different substrate types placed a different depths to produce undulations (or a contoured effect). Log, stone and sand piles are added for f