Green Roofs Make Sense
Green Roofs Help Clean Water, Lower Energy Usage and a Positive ROI
A recent and growing number of credible studies are quantifying the tremendous environmental, social and business benefits of green roofs. They’ve been proven to help address our urban environmental challenges, enhance employee productivity, save energy and money, and provide a positive ROI to building owners.
- Cooling buildings using decreased energy in the summer: Green roofs can reduce vertical heat gain by up to 87%.1
- Increased insulation in winter: Green roof adds R-value, reducing vertical heat loss by as much as 35%. 2
- Decreased burden on your HVAC system: The cooling effect on green roofs enhances HVAC efficiency, leading to reduced operating costs of as much as 15%-50% depending on the application and building.
- Longer roof life: Green roofs extend the lifespan of existing roof membrane life by 2x to 3x. Where a typical US roof lasts 15 years, green roofs in Europe have been known to last more than 50 years.
- Better storm water management: Many cities, states and municipalities recognize green roofs as a key storm water management solution and are providing tax breaks and incentives for their installation
- Enhanced solar panel efficiency: Green roofs have been shown to enhance solar efficiency by up to 15%, and are increasingly used in conjunction with solar installations.
- Noise reduction: YouTube’s headquarters in San Bruno, CA, which is located less than 5 minutes from SFO airport, has seen significant noise reduction from its green roof installed more than 10 years ago.
Studies have shown that employees, tenants, and even patients in hospitals have enjoyed better health, increased productivity, reduced stress, and enhanced mental health overall when their view is enhanced by a living roof.
1 April 2010 Columbia University/Con Edison Study comparing an extensive green roof’s performance against a conventional roof.
2 April 2010 Columbia University/Con Edison Study comparing an extensive green roof’s performance against a conventional roof.