What green roofs can mitigate urban heat islands?

The vegetation on green roofs in cities can not only shade the roof surface, but also absorb heat in the air through transpiration, effectively reducing the temperature of the roof surface and the surrounding environment. When the green roof reaches a certain scale, it can effectively play the role of alleviating the urban heat island. Studies have shown that vegetated roofs are cooler than the surrounding environment, while conventional roof surfaces can exceed ambient temperatures by 90°F (50°C) in extreme conditions. Green roofs can be installed on a variety of buildings, including industrial storage, cultural education, government offices, and other commercial and residential facilities. Our company has provided plastic flower pots for many roof projects. The water storage function greatly increases the survival rate of plants. It does not need to spend a lot of manual maintenance. The installation of plastic flower pots is very convenient.

The adjustment principle of green roof

Cooling principle

Green roofs alleviate the urban heat island effect through shading and transpiration, and the promotion of green roofs throughout the city can effectively reduce the ambient temperature.

shade

Green roofs, ground cover and associated growing substrates (specially engineered soils) can shade deciduous trees to allow more sunlight to pass through and radiate heat by up to 80%. The square roof surface layer effectively blocks direct sunlight.

transpiration

Plants absorb water through their roots and release water through their leaves, a movement of water called transpiration. Transpiration, the process by which water is converted from liquid to gas, also occurs on vegetation surfaces and in the surrounding growth substrate. Transpiration cools the air by using the heat in the air to evaporate water.

roof cooling

The cooling effect of green roofs depends on the composition of the roof structure, the moisture content of the growing substrate, the intensity of sunlight exposure, and other specific factors. Through shading and transpiration, most green roofs are much cooler in summer than traditional roofs.

heat island mitigation

Lowering the roof surface temperature reduces the amount of heat entering the building through the roof, helping to keep the building cool. In addition, lower roof temperatures also reduce air heat transfer above the building, helping to maintain cooler urban air temperatures.

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