Cool Roof Technology Abstract

The cool roof rating council was created in 1998 to develop accurate and credible methods for evaluating and labeling the solar reflectance and thermal emittance radiative properties of roofing products and to disseminate the information to all interested parties.

Cool roof technology abstract.

Thermal comfort improves by 2 5 c but heating demand increases by 10. Standard or dark roofs can reach temperatures of 150 f or more in the summer sun. It is a relatively cheap option with substantial benefits. Today tpo makes up over 50 of the single ply market.

In light of this cool roofing is one of the main strategies used to prevent future occurrences of heat island effects cool roofing is an emergent and powerful technology used for temperature control of buildings and areas. Cool roofs are changing the roofing industry. For example epdm was the most popular single ply membrane in the industry in 2003. A cool roof is a roofing system that delivers higher solar reflectance the ability to reflect the visible infrared and ultraviolet wavelengths of the sun reducing heat transfer to the building and higher thermal emittance the ability to radiate absorbed or non reflected solar energy than standard designed roofing products.

As a general guideline if a low slope roofing system meets california title 24 requirements it will also meet the leed and energy. 7 mitigating urban heat island using cool roof technologies pp. Advances in building energy research. Roof reflectivity of 0 6 0 7 is optimum for london climate.

Historically cool roofs have been either white. Cool roofs can be made of a highly reflective type of paint a sheet covering or highly reflective tiles or shingles. A cool roof under the same conditions could stay more than 50 f cooler and save energy and money by using less air conditioning. What to look for when selecting a cool roof technology.

Commercial buildings are benefiting from cool roof savings throughout the usa even in northern climates and that is fundamentally shifting the roofing marketplace. Highlights we studied the energy impact of a cool roof in an office building in london. Studies have isolated and evaluated the effects of climate surface reflectivity and roof insulation on energy savings thermal load mitigation and also ameliorating the urban heat. Active cool roof effect.

Overall energy demand reduces between 1 and 8 5 relative to an albedo of 0 1. Impact of cool roofs on cooling system efficiency. The study includes experiments and thermal modelling. When working to meet local environmental mandates the priority is to choose a cool roof that meets regional and or green rating council requirements.

A cool roof prevents heat absorption by reflecting the sun s heat and then emitting its radiation back into the atmosphere.