High Albedo Roof Materials

In the morning and in the late afternoon the high albedo materials were as cool as the air itself.

High albedo roof materials.

Residential roofing options include asphalt shingles metal clay tiles and concrete tiles. High albedo materials are those materials that have high reflectivity and low absorptivity. Coolroof heat reflective paint has sri value of 122 as per astm leeds standards for green buildings. Measures cr 1 and cr 2 examine the impacts of applying such a coating over a light gravel covered built up roof.

Tiles can be glazed to provide waterproofing or coated to provide customized colors and surface properties. Reflective surfaces can deliver high solar reflectance the ability to reflect the visible infrared and ultraviolet wavelengths of the sun reducing heat transfer to the surface and high thermal emittance the ability to radiate absorbed or non reflected solar energy. The solar reflective index sri for coolroof is 122. Other roof shingles can be coated at the factory or in the field to make them more reflective.

High albedo materials can save cooling energy use by directly reducing the heat gain through a building s envelope direct effect and also by lowering the urban air temperature in the neighborhood of the building indirect effect p p this project is an attempt to address high albedo materials for buildings and to perform measurements of roof coatings. Tile roofs can be made of clay slate or concrete. These research and development activities aim to develop i cool materials with similar visual appearance to classic noncool finishing ii thermochromic materials and iii high thermal capacity systems through the inclusions of phase changing materials. While conventional roofing materials warm up by an average 0 055 degrees c w m sup minus 2 the high albedo surfaces warm up by an average 0 015 degrees c w m sup minus 2 doi 10 2172 7000986 journal number volume place united states year wed jan 01 00 00 00 est 1992 month wed jan 01 00 00 00 est 1992.

Commercial cool roof options include bright white membranes and white coatings. As one would expect albedo roofs are formulated with special high eminence materials that keep project a high level of thermal energy back into the atmosphere. Coolroof paint is a high albedo product having solar reflectance of 0 95 and emissivity as high as 0 91. In contrast to conventional roofs these kind are specifically designed to reduce internal building temperature by reflecting the sun s uv rays.

For commercial roofing high albedo coatings can be applied over an existing roof in good repair as a retrofit. These materials are preferred during the development of smart cities and green buildings because they help neutralize the urban heat island effect in a natural manner.