Green Roofs are one type of Green Infrastructure built with the goal of capturing excess water and heat as well as provide an area with the many green space benefits.
Green roofs have a layer of plant material that absorbs water like a sponge. They capture water when it rains, slowly releasing it through evaporation and plant use. Green roofs can significantly reduce the amount of rain water that would otherwise run off an impervious roof surface. Green roofs can also help reduce building energy usage and noise levels, while increasing the durability and lifespan of the roof compared to conventional roofs. Green roofs are being increasingly used in urban areas where space constraints limit the use of other stormwater management practices.
Benefits of Green Roofs
The greater insulation offered by green roofs can reduce the amount of energy needed to moderate the temperature of a building, as roofs are the site of the greatest heat loss in the winter and the hottest temperatures in the summer.
The presence of a green roof decreases the exposure of waterproofing membranes to large temperature fluctuations, that can cause micro-tearing, and ultraviolet radiation.