In response to these problems, products like asphalt shingle coating have emerged. These products are created to make roofing in Dunedin, FL return to normal function before the latter was damaged. An article published in My Fox Tampa Bay, however, presents another side of sealants or coating that homeowners may not be aware of: However, there are some problems with sealants. The first is the actual preparation of the roof. Pressure washing may be recommended to get the roof as clean as possible before the sealant application, but professional roofers actually advise against pressure washing roofs because this can damage the shingles. At best, sealants can be a stopgap measure to keep a roof going for a few more years. And sometimes they can even damage a roof. One big concern is that a coat of sealant could disrupt the natural permeability of the roof, which means it won't ever get a chance to fully dry out, and that could lead to condensation inside the roof as well as the attic.
http://www.arrysroofing.com/industry-news/reliable-dunedin-fl-roofers-advise-to-hold-off-on-asphalt-coating/
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