High Albedo Roof Materials

For commercial roofing high albedo coatings can be applied over an existing roof in good repair as a retrofit.

High albedo roof materials. 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. 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. The most well known type of reflective surface is the cool roof. In the morning and in the late afternoon the high albedo materials were as cool as the air itself.

Coolroof paint is a high albedo product having solar reflectance of 0 95 and emissivity as high as 0 91. New materials in high albedo roof coatings this section describes the main innovation efforts around high albedo or cool coatings. Tiles can be glazed to provide waterproofing or coated to provide customized colors and surface properties. In contrast to conventional roofs these kind are specifically designed to reduce internal building temperature by reflecting the sun s uv rays.

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. High albedo materials are those materials that have high reflectivity and low absorptivity. The solar reflective index sri for coolroof is 122.

Measures cr 1 and cr 2 examine the impacts of applying such a coating over a light gravel covered built up roof. Other roof shingles can be coated at the factory or in the field to make them more reflective. 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. 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.

Commercial cool roof options include bright white membranes and white coatings. Coolroof heat reflective paint has sri value of 122 as per astm leeds standards for green buildings.