Green roofs provide many environmental benefits
As part of the permitting process, the Tennessee Department of Environment and Conservation mandates the City of Kingsport offer educational and outreach activities regarding stormwater, the city’s various control measures and why those measures are important to the general public.
The following article discusses the features of green roofs and the environmental benefits they provide to the community.
Unless you have an aerial view of your community, you may not notice whether or not a building has a green roof. And no, we’re not talking about the color of the shingles.
A green roof is a Stormwater Control Measure (SCM) where a roof is partially or completely covered with a lightweight growing medium and vegetation planted over a waterproof membrane. The roof could also include a root barrier and drainage and irrigation systems for better protection and longevity.
Green Roofs are designed to absorb water during a rain event and thereby reduce the amount of stormwater run-off from the roof. Green roofs also improve the aesthetics of an urban environment, capture airborne pollutants and provide space for community gardens and recreation.
Most green roofs have the same basic components to help them function properly, including:
- Plant layer – Various species of plants that can withstand sunny, dry conditions.
- Growing medium – Soil that supports the plants and allows rainwater to infiltrate.
- Drainage and filtration layer – To allow excess water to leave the soil.
- Protection and storage layer – To provide additional water storage and a root barrier.
- Waterproofing and insulation layer – To keep water from leaking into the building.
- Outlet structure – To allow water to exit the roof via gutters and downspouts.
Green roofs may be inspected by the local municipality to ensure they are functioning correctly. However, all maintenance is the responsibility of the property owner.
The vegetation should be maintained. Weeds, invasive species and dead plants should be removed, and the plants should be watered during periods of drought.
Trash and debris should be removed from the planting area. Gutters, roof drains and outlet structures should be kept clear, and the roof system should be checked for ponding water, leaks, or damage. The green roof should be observed during and after rain events to ensure it is functioning properly.
If you have a concern about a specific green roof in Kingsport, you may call Water Services at 423-229-9454.