What is a Green Roof?
GreenRoof Asia green roofs are installed on approved roof structures and consist of: a selected waterproofing layer; an optional insulation layer; selected drainage board; a geo-textile filter fabric beneath a proprietary lightweight growing medium; and a selected planting palette incorporating, where possible, indigenous plantings.
Green roofs can be designed and installed on all types of buildings, given a suitable load bearing roof structure. Depending on size, GreenRoof Asia will provide all structural review and approval requirements as part of a detailed green roof design and development package prior to installation.
Green roofs are important because unprotected roofs, when exposed to direct sunlight, get very hot. A black bitumen roof can easily reach temperatures of 80 centigrade Celsius. A roof with a green roof installed will normally be the same temperature as the surrounding air meaning green roof temperatures can be between 14–44 centigrade Celsius cooler than on traditional rooftops.
Also, on the floor directly below the roof top, green roofs have been shown to reduce heating and cooling by between 25 and 50%, while also considerably slowing a buildings heat gain and loss.
In addition, plants and growing substrates evaporate water, through evapotranspiration, to create a cooler air that is moist and more comfortable to breathe. This, in turn, will cool the surrounding area to help mitigate against the urban heat island effect.