Vegetative roofing refers to plant materials installed over a weatherproofing system. These roofs provide many benefits to the building and environment:
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- Storm Water Retention:
- Depending on the design, a green roof can typically reduce storm water run-off by 50 to 90%. Additionally, the peak flow volume is greatly reduced and the peak flow period is delayed by as much as 4 hours, minimizing the impact on existing sewer systems.
- Additional Thermal Resistance:
- Green roofs can improve the thermal resistance of the roof assembly throughout the year, especially in summer months by helping to reduce cooling costs.
- Reduced noise levels:
- Typical extensive green roofs (3" – 4” growing media) reduce reflective sound by up to 3 dB and improve sound insulation by up to 8 dB. This is most effective with buildings near airports, factories or busy freeways.
- Increased Life Expectancy of the Roof:
- A green roof, much like a PMR (Protected Membrane Roof ) Assembly, protects the roof membrane from climatic extremes and physical abuse, thereby greatly increasing the life expectancy of the roof.
- Additional Usable Space:
- Converting or designing normally unused roof areas into green roofs simply makes sense. Increase your property value by reclaiming the fifth elevation of a building and make it an amenity to be used by the buildings occupants.
- Building Incentives:
- More and more municipalities and other government agencies are providing incentives that can help off-set the cost of a green roof.
- Mitigates Urban Heat Island:
- Green roofs cool and humidify the surrounding air creating a microclimate which has beneficial effects within the immediate area.
- Natural Habitat for Animals and Plants:
- Green roofs create biodiversity, encouraging wildlife, such as birds, butterflies and insects, to remain within urban areas.
- Reduction of Dust and Smog Levels:
- Green roof vegetation helps to filter out dust and smog particles. Nitrates and other aerosol contaminants are absorbed out of the air and rainfall and bound within the soil.