Some of the benefits include:
- Energy Efficiency
Rooftop gardens can lead to a less and more effective use of energy. They provide added insulation, minimizing heat loss in winter and keep temperatures cool in summer thanks to its protection from direct sun exposure. This energy conservation means fewer greenhouse gas emissions. Additionally, rooftop gardens contribute to a decrease in the use of heating, ventilation, and air conditioning systems.
- Controlling Urban Overheating
The Urban Heat Island (UHI) concept is based on the increased temperature levels found in urban areas. Solar radiation warms up concrete and asphalt faster and to warmer temperatures than trees, plants, and greenery. The result is a big zone of hot air –a heat island– surrounding urban environments. Even though this might be beneficial in winter; it makes cities unbearably hot in summer. The resulting rise in energy demand, by the use of air conditioners and other cooling equipment, puts an excessive pressure on electrical grids. Through transpiration and evaporation, plants are able to cool down entire cities. Therefore, the UHI effect decreases as more green spaces are incorporated to the city.
- Decreased waste with composting
Organic waste is an unfortunate and abundant addition to land fill areas around the world. Not only can this debris be conversely used for beneficial means as high grade compost, but also landfills are estimated to be 2/3 organic waste. As landfills buildup with this decomposing organic material, methane gas is released, which is not only toxic to the air and soil, but it is also 20 times more effective at trapping heat into the atmosphere than carbon dioxide is, contributing enormously to global warming.
Placed in the stairwell of each floor of our building waste bins separated by type of debris can be found. Organic matter can be deposited by our guests, which is brought upstairs and added to our active compost pile. Within 45-90 days this waste in turned into remarkable compost, which gives needed nutrition to our garden. As a city-wide effort to make use of organic refuse still does not exist, we make the effort to gather a great deal of refuse from many of the local vegetable stands and add it to our compost turner.
- Effective use of rainwater
A roof garden’s ability to manage rainfall is a further benefit. After the immediate fall of rain, plants store water for later use and return the rest to the environment through transpiration and evaporation. Furthermore, the roof’s runoff is reduced in volume and is also cleaner than the one from a conventional roof, thus easing the burden on local infrastructure and storm sewer systems.
- Reducing smog and improving air quality
Another big advantage to roof gardens is their ability to filter polluted air particles, as well as gases, and to reduce the production of smog. Green roofs filter the air not only through plant’s photosynthesis process, but also by deposition in the soil of the growing area. This leads to lessening greenhouse emissions in urban areas.
Other benefits are:
Preventing combined sewer overflow, reducing carbon monoxide impact, removing nitrogen pollution from rain, and neutralizing acid rain effect, among many others.