A cool roof reflects and emits the sun’s heat back to the sky instead of transferring it to the building below. “Coolness” is measured by two properties, solar reflectance and thermal emittance. Both properties are measured from 0 to 1 and the higher the value, the “cooler” the roof.
Benefits of a Cool Roof?
Increase occupant comfort by keeping the building cooler during hot summer months. Cut costs by:
- reducing the need for air-conditioning, and extending the life of cooling equipment. Studies have shown typical cooling energy savings of 10-30% in cooling energy and an extension in the life of cooling equipment.
- decreasing roof maintenance costs (cool roofs are expected to last longer than the average roof). Address air pollution and Global Warming concerns by lowering CO2 and other emissions associated with fossil fuel-generated electricity used for air-conditioning.
Cool Roof Links:
Center for Environmental Innovation in Roofing (CEIR)
Cool Roof Rating Council
Consumer Energy Center
Department of Energy Cool Roof Guidelines
National Roofing Contractors Association Cool Roof Calculator
U.S. Green Building Council
U.S. Department of Energy
Database of State Incentives for Renewable Energy (DSIRE)