Dark-colored shingles typically heat 50 to 60 degrees Fahrenheit above ambient temperature. That means asphalt shingles can reach temperatures of 160 degrees Fahrenheit on a 100 degree Fahrenheit day. The biggest temperature difference was about 9°F, which occurred around noon. The average temperature difference throughout the day was about 2 degrees F.
Usually, the maximum pain of shingles is felt within 4 to 5 days after the first symptoms appear and occurs along with a blistering rash. Asphalt shingles, the most common type of roofing shingles, are flammable and can burn; however, it is likely illegal to do so. Asphalt shingles are made of petroleum, which makes them flammable but also toxic. Because of this, it is often illegal to burn shingles.
Parker estimated that for unventilated roofs, shingle lifespan would be reduced by 11% as a result. The slides refer to the fact that some tile manufacturers void their warranties when shingles are installed on unventilated roofs. Ventilating the area under a roof covering reduces the average temperature by 0.5 degrees Celsius (approximately one third of the influence of direction or color and thirty-six of the influence of geographical location). The three types of asphalt (air blown) used in roofing shingles soften in ranges from 140° F to 205° F, depending on the grade.
The data in that article addresses manufacturing temperature compared to subsequent roof temperature exposures of shingles from It is worth noting that the ambient temperature exposure experienced by asphalt shingles on a roof, even in a warm and sunny climate, will not approach temperatures used for the manufacture of the tiles. These temperatures explain why dancing on an asphalt tile roof on a very hot day can damage it, since roof surface temperatures could certainly be within the lower limit of this range. Most non-asphalt, clay and terracotta shingles, the most important being, are usually non-toxic, but depending on what materials they are tempered or covered with, they can be toxic, whereas the shingles themselves are unlikely to be.
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