BENEFITS OF GREEN ROOF SYSTEMS

Extend Service Life of the Roof

Applying a green roof to your roof surface protects the waterproofing membrane from UV radiation. Therefore the life of your waterproofing membrane is extended three to four times its average life, meaning that, in the long run, you save money and fewer materials go into the landfill because it does not need to be replaced as frequently. Green roofs also protect the roof surface from human traffic, dust and other debris.

Absorb Stormwater

Green roofs are a best practice for onsite water management. Here's why: They slow the velocity of runoff volume to sewer systems 60 - 90%.

Why should I care? Hundreds of communities in the United States have combined sewer systems. During heavy rainfalls excess water and the water contaminants associated can lead to combined sewer overflows into our watersheds. Green roofs present an opportunity to mitigate this all-too-common problem by absorbing much of the water in the root systems and releasing the rest back into the atmosphere through evapotranspiration. If there is runoff, green roofs slow it so that the sewer system isn't overburdened during peak usage.

Most commercial spaces are required to retain stormwater on site. A green roof eliminates or greatly decreases the space needed and costs associated with dealing with the stormwater.

View a study on storm water retention conducted in the city of Boston

Reduce Energy Costs

Green roofs greatly reduce the temperature of your roof in the summer time. It works best in buffering against daily temperature extremes. Your roof regularly reaches temperatures of 160º F. With a green roof the temperatures stay closer to 80º F. This means in the summer when energy demands and their associated costs are the highest you are reducing the amount of energy your building requires. The same is true in the winter but to a lesser degree. In today's world of rising energy costs, green roofs provide an amazing benefit.

Reduce Heat Island Effect

A natural function of plants is to cool the air through evapotranspiration (or release of water through plants into the atmosphere). With an increase of green roofs in the urban fabric we will start to see a reduction of the overall heat trapped in our cities.

Improve Air Quality

Like all plants, green roof plants sequester carbon dioxide from the air and release oxygen. Additionally, they remove smaller amounts of other contaminants in the air.

Higher Property Value & Quality of Life

Although difficult to quantify, green roofs provide many auxiliary benefits. Green roofs:

• Introduce an attractive and a dramatic amenity and transform rooftop eyesores into assets.
• Reclaim space for relaxation and passive recreation for employees and residents.
• Increase productivity for employees and recovery time for patients in health care facilities.
• Reduce noise heard by occupants, particularly near highways and airports.
• Create green space in neighborhoods that have little ground level space, increasing livability and helping to meet municipal mandates for green space.
• Create marketing value for your building and organization, resulting in higher rents and increased resale value.

Create Wildlife Habitats

Green roofs create new wildlife habitats for pollinators and insects.

Earn LEED Credits

Green roofs can earn LEED credits in the following categories of the USGBC's green building rating system:

PART 1: SUSTAINABLE SITES

• Reduced Site Disturbance, Protect or Restore Open Space
• Reduced Site Disturbance, Development Footprint Credit
• Landscape Design That Reduces Urban Heat Islands

PART 2: WATER EFFICIENCY

• Storm Water Management
• Water Efficient Landscaping 
• Water Use Reduction 
• Innovative Wastewater Technologies 

PART 3: ENERGY & ATMOSPHERE

• Optimize Energy Performance
• Renewable Energy 
• CFC and Ozone Depleting Substance Reduction

PART 4: MATERIALS & RESOURCES

• Storage and Collection of Recyclables
• Recycled content materials

PART 5: INDOOR ENVIRONMENTAL QUALITY

PART 6: INNOVATION IN DESIGN

Learn more about LEED credits for green roof systems:

USGBC: LEED

GreenRoofs.org