Green Roof

According to Nian She of Journal of Hydrological Engineering, the green roof is defined as "multilayered vegetation roofing material including route barrier, waterproof membrane, drainage system and plant-covered growth medium layer" (Theodosiou 2009). A green roof, also known as a living roof, has existed for centuries. When the world uses only natural materials for construction, they are used as insulation. They are now considered to be sustainable architectural designs in the future.

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.

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.