With energy costs on the rise, the popularity of garden roofing systems is also climbing. The greater insulation offered by garden roofs can reduce the amount of energy needed to maintain the temperature of a building.
Moderation of Urban Heat Island Effect
Florida roofs are the main reason for cooling loss in the summer. For example, research published by the National Research Council found that a green roof can reduce the daily energy demand for air conditioning in the summer by over 75%. Through the daily dew and evaporation cycle, plants on vertical and horizontal surfaces are able to cool buildings during hot summer months and reduce the Urban Heat Island (UHI) effect. This Urban Heat Island (UHI) effect results in irregular weather patterns like higher temperatures in summer months and loss of rainfall. The light absorbed by vegetation would otherwise be converted into heat energy. Florida is one of several states to help businesses stimulate a more eco-friendly environment.
Garden roofs can increase a building’s marketability. They are an easily identifiable symbol of the green building movement and can act as an incentive to those interested in the multiple benefits offered by green roofs.
Green roofs have excellent noise attenuation; an extensive garden roof can reduce sound from outside by 40 decibels, while an intensive one can reduce sound by 46-50 decibels (Peck et al. 1999).
Increased Roofing Membrane Durability
The number one reason for roof membrane damage is UV, i.e. the sun. The presence of a green roof along with removing the roof system from UV entirely decreases the exposure of waterproofing membranes to large temperature fluctuations, that can cause micro-tearing, and ultraviolet radiation.
Green roofs can sustain a variety of plants and invertebrates, and provide a habitat for various bird species. By acting as a stepping stone habitat for migrating species they can link species together that would otherwise be fragmented.