Integrated Project

A green roof system is an extension of the existing roof which involves, at a minimum, high quality waterproofing, root repellent system, drainage system, filter cloth, a lightweight growing medium, and plants.

Green roof systems may be modular, with drainage layers, filter cloth, growing media, and plants already prepared in movable, often interlocking grids, or loose laid/built-up whereby each component of the system may be installed separately. Green roofs can be defined as "contained" green space on top of a human-made structure. This green space could be below, at, or above grade, but in all cases it exists separate from the ground. Green roofs can provide a wide range of public and private benefits and have been successfully installed in countries around the world.

In North America, the benefits of green roof technologies are poorly understood and the market continues to mature, despite the efforts of industry leaders. In Europe however, these technologies have become very well established. This has been the direct result of government legislation and financial support. Such support recognizes the many tangible and intangible public benefits of green roofs. This support has led to the creation of a vibrant, multi-million dollar market for green roof products and services in Germany, France, Austria, and Switzerland, among others.

Green roof technologies not only provide the owners of buildings with a proven return on investment, but also represent opportunities for significant social, economic, and environmental benefits, particularly in cities.

Public Benefits of Green Roofs

Aesthetic Improvements: Urban greening enhances the appearance of buildings and attracts investment.
Waste Diversion: Green roofs reduce landfill waste by extending the life of waterproofing membranes, using recycled materials, and decreasing HVAC system use.
Stormwater Management: Green roofs absorb and manage rainwater, retaining 70-90% in summer and 25-40% in winter, reducing runoff and stress on sewer systems.
Moderation of Urban Heat Island Effect: Green roofs cool cities by absorbing light, reducing the Urban Heat Island (UHI) effect, and lowering dust, particulate matter, and smog levels.
Improved Air Quality: Plants on green roofs capture pollutants and reduce CO2 emissions, which can also lower power plant demand.
New Amenity Spaces: Green roofs create community gardens, commercial areas, and recreational spaces, enhancing urban environments.
Local Job Creation: Expanding green roof markets can generate jobs in manufacturing, design, installation, and maintenance, with potential for significant economic impact.

Private Benefits of Green Roofs

Energy Efficiency: Green roofs enhance insulation, reducing heating and cooling costs. Studies show they can cut summer air conditioning energy demand by over 75%.
Increased Roofing Durability: They protect waterproofing membranes from temperature extremes and UV radiation, extending their lifespan.
Fire Retardation: Green roofs have lower burning heat loads compared to conventional roofs, improving fire safety.
Reduction of Electromagnetic Radiation: They block 99.4% of electromagnetic radiation.
Noise Reduction: Green roofs effectively dampen noise, reducing external sound by 40-50 decibels.
Marketing: Green roofs boost a building’s market appeal, aid in sales and leasing, increase property value, and attract and retain employees.

Design-Specific Benefits of Green Roofs

Increased Biodiversity: Green roofs support diverse plant and animal species, providing habitats for birds and linking fragmented ecosystems. This benefits ecosystems, economies, and social well-being.
Improved Health and Well-Being: By reducing pollution and enhancing water quality, green roofs can lower healthcare needs and foster community cohesion and safety.
Urban Agriculture: Green roofs can host local food projects, reducing environmental footprints and boosting community empowerment and nutrition.
Educational Opportunities: They offer practical sites for teaching about biology and green roof technologies in educational settings.