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 harder and can cost as much as 50% more to install. So why would you consider building a green roof?
What is ecological roofing
An eco friendly roof (GR) provides a base on the top of a structure where various plant life may grow. Recent GR progress has become developed in Germany. About 10% in the buildings in Germany are now green. The covering is built up in layers, each layer fulfilling a different function. The base layer sits along with the substrate and supplies a waterproof seal for the building. This may come by means of metal tray roofing or even a synthetic membrane. A drainage layer is included in allow water to evacuate the roofing, then a filter and root protection layer. The root protection membrane prevents plant growth from puncturing the waterproof membrane and causing leaks. The ultimate layer is the growing medium in which the plant growth is bedded. Green or “living roofs” could be split into three main categories. Extensive, Intensive and Bio diverse.
Extensive green roofs
Extensive GR, (also known as Eco roofing) can be used to promote the expansion of mosses, herbs and grasses. The growing medium is relatively shallow with a depth which is between 60-200mm. The weight from the plant medium is 60-150kg per square metre. Eco roofing is used where there is very little or no human foot traffic and low maintenance roofing is needed. 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 class of roofing supplies the widest range of planting opportunities. Shrubs, flowers and even trees can be utilised. The depth in the growing medium is between 150-400mm. This pushes the weight per square metre approximately 180-500kg and needs an important structure to aid it.
Bio diverse green roofing – Bio diverse roofing is made to be left alone to reproduce 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 are permitted to take root. Bio diverse roofing is frequently targeted at providing a certain habitat to get 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 Ultra violet rays break up the top of the roofing causing leaks and the requirement for early replacement. The growing medium of living roofs provides a protective layer preventing damage through the sun. This may twice the lifespan from the roofing and recoup the initial extra cost of installation. Further, green roofing supplies a thermal layer keeping the property cooler in summer and warmer during winter. Planners within local government have finally realized the benefits 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 the environment – Urban roofs constructed with traditional roofing materials absorb the suns rays and emit them as heat. It has resulted in the urban heat island effect. This effect is most noticeable at nighttime with urban areas being warmer than surrounding areas. The environment temperature in the uk is approximately 6 degrees higher at night because of the urban heat island effect. Green zjghhj will not absorb the heat 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 areas of concrete and tarmac stop 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 property reducing energy consumption and carbon emissions even further.
Depending on the growing medium and also the species present, green roofing can store up to 239 grams of carbon per square metre. It possesses a valuable habitat for plants and insects in addition to providing food for bee’s and seed eating birds. Ultimately ecological roofing replaces the green footprint removed by the building.
Modern roofing materials provide a lighter, simpler to maintain option for eco roofing. Lightweight mats and module trays allow localized maintenance without having to take the Roof Garden. Considering the huge financial and environmental benefits of living roofs, the near future for green roofing looks rosy.