U.S. Department of Energy - Energy Efficiency and Renewable Energy

Federal Energy Management Program

New and Underutilized Technology: Green Roofs

The following information outlines key deployment considerations for green roofs within the Federal sector.


Green roofs place vegetation on the rooftop to reduce heat load and add insulation. It also reduces storm runoff from the roof.


Green roofs are appropriate for deployment within most building categories with higher roof to conditioned floor area ratios and should be considered in building design, renovation, or during roof replacement projects.

Climate and Regional Considerations

Climate issues can affect the performance of green roofs.

Key Factors for Deployment

Green roofs have weight loading issues, which need to be considered prior to deployment.

Ranking Criteria

Federal energy savings, cost-effectiveness, and probability of success are ranked 0-5 with 0 representing the lowest ranking and 5 representing the highest ranking. The weighted score is ranked 0-100 with 0 representing the lowest ranking and 100 representing the highest ranking.

Federal Energy Savings Cost Effectiveness Probability of Success Weighted Score
0.4 3.0 2.8 33