Green roofs support biodiversity by creating habitat spaces for various plant species, insects, and birds that may not otherwise thrive in urban areas. These roofs provide a micro-ecosystem where native plants can grow and attract pollinators, contributing to urban biodiversity and helping to mitigate the loss of natural habitats in cities.

One of the significant advantages of green roofs is their ability to manage stormwater runoff. The vegetation and substrate on green roofs absorb rainwater, reducing the volume of water that flows into stormwater systems. This helps prevent flooding, erosion, and pollution of natural water bodies, as the plants and soil act as a natural filter, removing pollutants from the rainwater.

Green roofs offer enhanced thermal performance for buildings. The vegetation and soil layers act as insulation, reducing heat transfer between the interior of the building and the external environment. This can lead to improved energy efficiency, reduced heating and cooling costs, and a more comfortable indoor environment for occupants.

Urban heat islands occur when cities experience significantly higher temperatures than surrounding rural areas due to the concentration of heat-absorbing materials like concrete and asphalt. Green roofs help mitigate this effect by providing a cooling influence through evapotranspiration, where plants release moisture into the air, creating a localised cooling effect.

Plants on green roofs absorb carbon dioxide and release oxygen through photosynthesis. Additionally, the vegetation helps filter out airborne pollutants, contributing to improved air quality in urban areas.

Green roofs enhance the visual appeal of buildings and provide green spaces that occupants can enjoy. They offer opportunities for relaxation, social interaction, and even urban agriculture in some cases.

The vegetation and substrate on green roofs act as a protective layer for the roofing membrane, shielding it from the harsh effects of sunlight, temperature fluctuations, and physical damage. This can extend the lifespan of the roof and reduce maintenance and replacement costs.