Value Of Haivng A White Coated Roof

Sri measures the roof s ability to reject solar heat defined such that a standard black reflectance 0 05 emittance 0 90 is 0 and a standard white reflectance 0 80 emittance 0 90 is 100.

Value of haivng a white coated roof.

Some of them are also safe for pets and children. Some are also water based coatings that do not have nasty strong odors on them. The city of new york has recently coated more than 10 million sq ft of rooftops white. It has a solar reflectance value of 86 a thermal emittance value of 93 and a solar reflective index of 108 overall.

The infrared image on the right shows 79 c 174 f on the uncoated black section of the modified bitumen roof. They won t damage the rv roof with unnecessary chemicals. The best roof coating products are also non polluting for the environment. The coated white section is 26 c 79 f.

The urban heat island can be a killer. But its potential value in ameliorating the most severe consequences of excess heat in cities could be life saving. A perfect sri is approximately 122 the value for a perfect mirror which absorbs no sunlight and has very low emissivity. Contemporary metal roofing has a 50 year rated.

Surecoat systems white roof coating is 10 426 dry mils thick per gallon per 100 square feet 5 10 times thicker than roof paint and 2 3 times thicker than most other coatings. The per square foot cost of a premium metal roof is 9 58 with a comparable asphalt shingled roof s march 2012 per square foot cost being 3 41. The best roof coating products are also safe and non toxic. Generally white in color or with white surfacing these membranes reduce the solar radiation collected by roofing surfaces which lowers the roof surface contribution to the energy used to condition air and to the local environment.

On a practical level white roofs in colder climates are more prone to developing condensation which leads to lower wind resistance lower insulation values and the formation of mold. Gaf united coatings 5 gallon silicone reflective roof coating 20 year limited warranty item 1051026.