Green Roof: Fast Facts

A $4 investment (per square foot) in building green nets a $58 benefit (per sq. ft.) over 20 years:

• Estimated health & productivity benefits: $46
• Operations & maintenance: $8.50
• Energy savings: $5.80
• Emissions savings: $1.20
• Water savings: $0.50

Source: U.S. Environmental Protection Agency

Tenants can save about 50 cents per square foot each year through strategies that cut energy use by 30%. This can represent a savings of $50,000 or more in a five-year lease on 20,000 square feet

Source: U.S. Environmental Protection Agency

Studies

1. Ryerson University,�Quantitative Findings Oct. 2005, Report on the Environmental Benefits and Costs of Green Roofing
2. Evaluating Green Roofs Energy Performance Aug. 2005 (Liu, Bass)
3. "The results for the winterized house were good, and the results for the regular house were dramatic," Bass, Nov. 2005
4. Research Related to Green Roofs ...Heat flow was reduced by more than 75%, Liu and Baskaran (2003)