White Roof Reflectivity

White or reflective roofs have been in use for the past 15 years.

White roof reflectivity.

Commonly referred to as cool roofing it has received a stamp of approval from the state of california which has adopted its use in its building codes. Volunteers have taken white paint to nearly 7 million square feet of tar roofs in the city though that is still only about 1 percent of the potential roof area. A cool roof generally has a reflectivity higher than 65 percent or 65. Citation needed a roof made of white thermoplastic for example can reflect 80 percent or more of the sun s rays and emit at least 70 of the solar.

Coatings are like very thick paints that can protect the roof surface from ultra violet uv light and chemical damage and some offer water protection and restorative features. New york for instance introduced rules on white roofs into its building codes as long ago as 2012. There are many small scale initiatives in cities to make roof surfaces more reflective. White thermoplastic membrane roofs pvc and tpo are inherently reflective achieving some of the highest reflectance and emittance measurements of which roofing materials are capable.

Cool roof coatings are white or special reflective pigments that reflect sunlight. It has become a leed leadership in energy and environmental design standard of the u s. Products are available for most roof types.