Traditional roofing is designed to shed water as soon as possible from the Green Roof System. Conversely, green roofing actually holds water on the roof. It may also make maintenance more challenging and can cost as much as 50% more to install. So why would you think of building a green roof?
What exactly is ecological roofing? A green roof (GR) offers a base on top of a structure where various plant life may grow. Recent GR progress continues to be created in Germany. About 10% from the buildings in Germany are green. The covering is constructed up in layers, each layer fulfilling a different function. The base layer sits along with the substrate and provides a waterproof seal towards the building. This could come by means of metal tray roofing or even a synthetic membrane. A drainage layer is included in allow water to evacuate the rooftop, followed by a filter and root protection layer. The basis protection membrane prevents plant growth from puncturing the waterproof membrane and causing leaks. The ultimate layer will be the growing medium where the plant growth is bedded. Green or “living roofs” could be separated into three main categories. Extensive, Intensive and Bio diverse.
Extensive green roofs – Extensive GR, (also referred to as Eco roofing) is used to promote the development of mosses, herbs and grasses. The growing medium is relatively shallow having a depth which is between 60-200mm. The load in the plant medium is 60-150kg per square metre. Eco roofing is used where there is little or no human foot traffic and low maintenance roofing is needed. This kind of roofing is the cheapest to install.
Intensive green roofing – Roof gardens and park gardens are constructed using Intensive green roofing. This group of roofing offers the widest selection of planting opportunities. Shrubs, flowers and even trees may be utilised. The depth in the growing medium is between 150-400mm. This pushes the body weight per square metre approximately 180-500kg and requires a significant structure to back up it.
Bio diverse green roofing – Bio diverse roofing is made to be left alone to breed an organic ecosystem. Soil levels on the surface are varied to generate an array of different habitats for many different species. Local plants are grown and wind swept seeds are allowed to take root. Bio diverse roofing is usually aimed at providing a particular habitat for a threatened species.
The rewards for that building – Green roofing can turn an unattractive urban roof into an attractive feature. As well as the aesthetic useful, living roofs provide numerous financial benefits. The waterproof membrane on roofs is subjected constantly to Ultra Violet light. These UV rays break down the surface of the roofing causing leaks and the need for early replacement. The growing medium of living roofs provides a protective layer preventing damage from the sun. This could double the life-span in the roofing and recoup the initial extra cost of installation. Further, green roofing provides a thermal layer keeping the building cooler in summer and warmer in winter. Planners within local government have now realized the advantages of ecological roofing. Many district councils offer financial incentives to developers using green roofing on new buildings. This trend continue as the necessity to reduce carbon emissions increases.
The benefits for that environment – Urban roofs constructed with traditional roofing materials absorb the suns rays and emit them as heat. This has triggered the urban heat island effect. This effect is most noticeable during the night with urban areas being warmer than surrounding areas. The environment temperature in the uk is all about 6 degrees higher at night due to the urban heat island effect. Green zjghhj fails to absorb the heat radiation therefore the effect is mitigated. Thus, the requirement for air conditioner might be reduced in hotter climates.
Mass urbanisation leads to high water run off and flooding. Huge areas of concrete and tarmac avoid the natural drainage of heavy rainfall. Green roofing absorbs between 50-75% of rainfall, gradually releasing it into the environment. This evaporation process also cools the building reducing energy consumption and carbon emissions further.
Depending on the growing medium and the species present, green roofing can store as much as 239 grams of carbon per square metre. It possesses a valuable habitat for plants and insects as well as providing food for bee’s and seed eating birds. Essentially ecological roofing replaces the green footprint removed from the building.
Modern roofing materials provide a lighter, much easier to maintain selection for eco roofing. Lightweight mats and module trays allow localized maintenance without the need to consider the Modular Green Roof Trays. Considering the huge financial and environmental benefits associated with living roofs, the near future for green roofing looks rosy.