Green Roof

The green roof is also called a living roof, an ecological roof, a roof terrace, or a roof garden and is a design of the roof of a building surrounded by vegetation and growth medium partially or totally. Layers such as roof railings and drains. He and Jim (2010) pointed out that green roof needs vegetation space on artificial structural design. They help to lower the thermal performance of the building, resulting in improved cooling energy and social comfort.

Green roofs and roof gardens are layers of plants planted on the roof. The green roof provides a sunshade, removes heat from the air and lowers the temperature of the roof surface and surrounding air. Especially during the day, using green roofs in vegetation limited cities and other building environments can ease the influence of heat island. The temperature of the green roof is 30-40 degrees Fahrenheit lower than the traditional roof and the ambient temperature of the city can be lowered by 5 degrees F.1.2. In addition, the green roof can reduce building energy consumption by 0.7% roof compared with traditional roofs. 1 sq. Ft. Roof surface saves $ 0.23 per year 1, 3 These cooling and energy savings are the main factors increasing popularity of green roofs in the United States. In 2016, the green roof industry in North America is estimated to grow by more than 10% since 2015, and the industry's growth trend continues over the past decade.

There are two kinds of green roofs: a dense green roof and a vast green roof. The densely green roof is thicker and can support a variety of plants. They are heavier and require more maintenance. They are made in such a way as to make them easy to use. Another green roof is known as a vast green roof. These types of green roofs are covered with brighter vegetation and are easier to maintain than dense green roofs. They are mainly developed for aesthetic purposes, but they also have various advantages for the environment.

There are three kinds of green roof, "dense", "half-dense", "wide" depending on the selection of plants (Green Roofs Today, 2010). The dense green roof is a green roof that accommodates large plants, trees, and full grass. This type of green roof requires a lot of soil and requires a lot of maintenance. Medium-density green roofs correspond to mid-sized plants and do not require maintenance. A wide variety of green roofs are the most convenient of all types of green roof systems and include a growth medium and a thin layer roof cover of vegetation that requires minimal care and maintenance (Green Roofs Today, 2010 ).