Depending on what kind of green roof it is, the maintenance costs could be higher, but some types of green roof have little or no ongoing cost. The main disadvantage of green roofs is that the initial cost of installing a green roof can be double that of a normal roof. But before you select a garden roof for your property, be sure you avoid the common pitfalls and hassles associated with many garden roof systems: The list of benefits for garden roofs is long. Covered in native vegetation and having an expected lifetime of fifty years, this green roof will not only save the USPS approximately $30,000 a year in heating and cooling costs, but will also significantly reduce the amount of storm water contaminants entering the municipal water system. project began in September 2008, and was finished and dedicated in July 2009. The largest Green Roof in New York City was installed in midtown Manhattan atop the United States Postal Service's Morgan Processing and Distribution Center. Intensive Roofs - which are thicker, with a minimum depth of 12.8 cm (5.0 in), and can support a wider variety of plants but are heavier and require more maintenance.Įxtensive Roofs - which are shallow, ranging in depth from 2 cm (0.79 in) to 12.7 cm (5.0 in), lighter than intensive green roofs, and require minimal maintenance. Decrease stress of the people living around the roof by providing a more aesthetically pleasing landscape. Green roofs are becoming increasingly common in Chicago, as well as Atlanta, Portland, and other United States cities, where their use is encouraged by regulations to combat the urban heat island effect. Combating the urban heat island effect is another reason for creating a green roof. Helping to lower urban air temperatures and mitigate the heat island effect by reducing cooling (by evaporative cooling) loads on a building anywhere from fifty to ninety percent (especially if it is glassed in so as to act as a terrarium and passive solar heat reservoir).As for runoff, green roofs decrease the total amount of water runoff and It has been found that they can retain up to 75% of rainwater, gradually releasing it back into the atmosphere. Not only retain rainwater, but also moderate the temperature of the water and act as natural filters for any of the water that happens to run off.With green roofs, water is stored by the substrate and then taken up by the plants from where it is returned to the atmosphere through transpiration and evaporation.If installed correctly many living roofs can contribute to LEED points.Help to insulate a building for sound the soil helps to block lower frequencies and the plants block higher frequencies. Through their ability to sequester carbon, carbon is the main component of plant matter and is naturally absorbed by plant tissue.Filter pollutants and heavy metals out of rainwater.Garden Roofing Systems are quickly and easily installed, which means less disruption to your business or your tenants.They can be combined with a deck system to create not only an energy-saving system, but an outdoor deck, patio, or other functional area- it's like adding an extra floor to your property at a fraction of the normal cost.Tax benefits, depending on the region in which a green roof is installed, incentives may be available in the form of storm water tax reduction, grants, or rebates.Buildings retain their heat during the cooler winter months while reflecting and absorbing solar radiation during the summer, allowing buildings to remain cooler. The lush greenery absorbs virtually all of the heat, creating natural insulation and superb temperature control.
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