Green roofs, a natural habitat creation, is generally installed to reduce heat until 2005, when Brad Bass, a researcher from University of Toronto published a study that showed the uses of green roofs during winters and monsoons by evaporative cooling and reducing the flow rate of storm water.
Primarily, when green roofs are installed methodologically based on the local government regulations, they can invariably reduce the environmental pollutions by reducing carbon content from the atmosphere and increase the LEED credits of the locality. Additionally, they act as thermal insulators and hence by strives against the urban heat island effect. Following an experimental study based on the green roof’s response on urban heat island effect in Chicago, the green roofs could effectively decrease the urban temperature up to 7 degrees Celsius. Also during heavy storms, the rainwater when passed through the green roof, the flow rate reduces and they also act as a major filtration process, allowing the plants to absorb the toxic minerals. With the increasing urban scenario, the green roofs attract insects and other animals that are deficit of their natural habitats. Indirectly, the health benefits and the reduction of respiratory diseases in humans are most likely. Also, they act as a good medium of sound insulators, the soil layers and the plants provide insulation even from higher frequency rates.
Though the installation costs vary from country to country, their financial benefits remain uncanny. It is said that, the re-installation cost of a green roof is only 1/3 rd. of the original laying cost. The energy consumption is vastly reduced in all weather conditions, is the subsequent result of a study by environment Canada. It also states that, during summer, the energy used is reduced by 27% by reflecting the solar radiation and the energy used is reduced by 26% by retaining the absorbed heat during winter. Thereby manages the building temperature without much energy consumption. The green roofs are also determined as aesthetical value, increasing the resale value by 7%. Hence, the Green roofs reflect the ultra violet rays during summer and reduces seepage of water through water resistant membrane during monsoons, the life span of the building is increased by at least three folds. Above all, based on the governing bodies, incentives in the form of tax reductions are made. For instance, in New York city, the owners of the building can avail one-year property tax credit by greening at least 50% of the roof area.
As an example, a housing project, an eco-friendly-high rise in Singapore, to create a sustainable building in an equatorial country, given the temperature is challenging. However, it is achieved through, Green roofs, passive cooling and cross-ventilation. The form of the building mimics curves which accentuates the cross ventilation and also provide ample natural light. The high-rise also features solar panels and water-way terraces which subsequently reduces the energy consumption. This project, is an authentic paradigm of the beneficial effects of Green roofs and other sustainable techniques.
“Green Roof Benefits – GRHC WEBSITE”. 2016. GRHC WEBSITE. http://www.greenroofs.org/index.php/about/greenroofbenefits.