Traditional roofing is designed to shed water as quickly as possible from the Green Roof System. Conversely, green roofing actually holds water on the roof. It may also make maintenance more difficult and can cost as much as 50% more to install. So why would you think of building a green roof?
Precisely what is ecological roofing? An environmentally friendly roof (GR) provides a base on top of a structure in which various plant life may grow. Recent GR progress continues to be created in Germany. About 10% in the buildings in Germany are now green. The covering is made up in layers, each layer fulfilling an alternative function. The base layer sits on the top of the substrate and supplies a waterproof seal towards the building. This may come in the form of metal tray roofing or a synthetic membrane. A drainage layer is added to allow water to evacuate the roofing, followed by a filter and root protection layer. The main protection membrane prevents plant growth from puncturing the waterproof membrane and causing leaks. The ultimate layer will be the growing medium in which the plant growth is bedded. Green or “living roofs” could be divided into three main categories. Extensive, Intensive and Bio diverse.
Extensive green roofs – Extensive GR, (also called Eco roofing) can be used to promote the development of mosses, herbs and grasses. The growing medium is fairly shallow with a depth of between 60-200mm. The body weight from 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 required. This type of roofing will be 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 variety of planting opportunities. Shrubs, flowers as well as trees can be utilised. The depth in the growing medium is between 150-400mm. This pushes the load per square metre as much as 180-500kg and needs an important structure to support it.
Bio diverse green roofing – Bio diverse roofing is made to be left alone to breed a natural ecosystem. Soil levels on the surface are varied to generate an array of different habitats for various species. Local plants are grown and wind swept seeds can take root. Bio diverse roofing is frequently aimed at providing a specific habitat for a threatened species.
The benefits for the building – Green roofing can change an unattractive urban roof into an great looking feature. And also the aesthetic useful, living roofs provide numerous financial benefits. The waterproof membrane on roofs is subjected constantly to Ultra-violet light. These UV rays breakdown the surface of the roofing causing leaks and the necessity for early replacement. The growing medium of living roofs supplies a protective layer preventing damage through the sun. This can twice the life span in the roofing and recoup the initial extra cost of installation. Further, green roofing provides a thermal layer keeping your building cooler in summer and warmer during winter. Planners within local government have now realized the benefits of ecological roofing. Many district councils offer financial incentives to developers using green roofing on new buildings. This trend will continue as the requirement to reduce carbon emissions increases.
The benefits for the environment – Urban roofs built with traditional roofing materials absorb the suns rays and emit them as heat. This has led to the urban heat island effect. This effect is most noticeable during the night with urban areas being warmer than surrounding areas. The environment temperature inside london is all about 6 degrees higher at night due to the urban heat island effect. Green zjghhj fails to absorb the warmth radiation therefore the effect is mitigated. Thus, the necessity for air conditioning might be reduced in hotter climates.
Mass urbanisation leads to high water run off and flooding. Huge regions of concrete and tarmac stop the natural drainage of heavy rainfall. Green roofing absorbs between 50-75% of rainfall, gradually releasing it back into the environment. This evaporation process also cools the property reducing energy consumption and carbon emissions further.
Depending on the growing medium as well as the species present, green roofing can store approximately 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. Ultimately ecological roofing replaces the green footprint removed through the building.
Modern roofing materials provide a lighter, much easier to maintain option for eco roofing. Lightweight mats and module trays allow localized maintenance without the need to take the Green Roof Modules. Considering the huge financial and environmental advantages of living roofs, the near future for green roofing looks rosy.