What is a Green Roof or Roof Garden?
Simply put, a green space built on a layer of waterproofing on the roof is called a green roof. In order to implement a green roof, special waterproofing, drainage layer, irrigation system and hedge are usually installed on the concrete surface, and then the green space design is done. Green roof or roof garden is such that a lightweight system is created by providing conditions for plant biodiversity.
Green roofs and walls, either vertically or in height, simultaneously serve the public interest of society and the environment.
Increase the population of cities and as result the high value of urban lands, most of the space has been devoted to construction of residential units and we can not hope for the construction of open spaces. Today, the density of construction and elevation with the terms “environmental compatibility” and “maximum efficiency of existing surfaces” is on the agenda. One of the most pervasive solutions in developed countries is to increase non-level green areas. By upgrading green roofs and walls, it is possible to increase green areas vertically or in height without altering land use, while at the same time serving the general interests of society and environment.
Green roof of Arge tejari Tajrish implemented by Varziran Green Roof waterproofing
Benefits of Green Roof:
Reduce air pollution and carbon dioxide
Create sound insulation
Promoting profit and asset value
Reduce thermal islands
Increase the productivity of unused spaces
Among the benefits of green roof are rain water absorption, dust absorption and air pollution, and as a result, the freshness of the surrounding air and the absorption of noise pollution. A green roof can save more than 50% of rainwater for later use and prevent it from being wasted. Excess water also comes out of the green roof through drainage channels. From an environmental point of view, if green roofs are widely implemented in urban areas, by absorbing carbon dioxide and producing oxygen, it will purify and reduce pollution. According to a study conducted by a research group in Canada, 1.5 square meters of plant with a height of 40 cm, can provide the oxygen needed by humans for one year. The surface of the plants absorbs airborne particles, then these particles enter the planting layer by rain.
Another advantage of green roofs compared to traditional roofs is energy savings and reduced heating and cooling costs. The growth of the plant on the roofs reduces heat and air temperature around building in summer and due to ability to insulate the planting layers, prevents heat from entering building outside. This property of green roof insulation in winter reduces the need for thermal energy inside building and helps to store energy. With the development and expansion of green roofs on an urban scale, the vast dimensions of public and private energy savings can be beneficial on a global scale, given current energy crisis and pollution. The best waterproofing for green roofs is produced by bitumen modified with SBS polymer. Although the final price of this type of waterproofing is higher than ordinary waterproofing such as isogum, but due to the fact that it is made of the best bitumen modifying polymer, from the root. The plant prevents root over time and has a very high cold tolerance and flexibility. Important green roof waterproofing, such as Varzflex® Green Roof Varziran insulation, in addition to the mentioned features, has an important self-repairing property that gives high confidence to the executors of green roof projects.
Other environmental effects of green roofs include reducing and modifying the intensity of noise pollution, especially in large cities. Green roof acts as a sound insulator and has the ability to reduce noise pollution by absorbing sound waves. The green roof planting layer absorbs low frequencies and its vegetation absorbs high frequencies and reduces its intensity. As a result, these types of roofs are especially effective for buildings adjacent to airports, highways, train stations, factories and other noisy industrial centers. According to research by the Housing Authority of Canada, a 12 cm deep planting layer can reduce 40 decibels of noise pollution.