Value Of Haivng A White Coated Roof

Some are also water based coatings that do not have nasty strong odors on them.

Value of haivng a white coated roof.

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. The urban heat island can be a killer. The best roof coating products are also non polluting for the environment. The coated white section is 26 c 79 f.

Other places like california have updated building codes to promote cool roofs which are seen as an important. Oleson found that even if every city building roof and stretch of urban pavement in the world were painted white it would only delay global warming by 11 years. 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. Gaf united coatings 5 gallon silicone reflective roof coating 20 year limited warranty item 1051026.

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. Some of them are also safe for pets and children. The city of new york has recently coated more than 10 million sq ft of rooftops white. The infrared image on the right shows 79 c 174 f on the uncoated black section of the modified bitumen roof.

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. 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. The best roof coating products are also safe and non toxic.

They won t damage the rv roof with unnecessary chemicals. But its potential value in ameliorating the most severe consequences of excess heat in cities could be life saving.