The Truth about Sealing your tile roof
In all the years in business I have seen so many product claims it’s hard to sort through them all. My company has done more product trials than you can imagine. Through all of this we have realized there is no solution great to keeping a roof clean. There are companies out there that claim to have sealants that extend the life of the cleaning. Sealers that contain true quantities of solids that create barriers are expensive. The cost for application of these products is roughly between $0.55 and $1.00 per square foot. The only real advantage is that these sealants can block moisture retention and create a barrier with higher reflective capabilities that reduces harmful color fading from the sun. Also if you own a shingle roof you will see less granular loss that comes naturally from weathering. The problem is the cost effectiveness. For the average budgeting family the overall cost of these sealants greatly outweighs there benefits. The application of a sealant does not normally reduce roof cleaning by any great amount of time. Application of such products can usually extend your cleaning to between 7-10 years instead of the usual 2-4 years. The average cost of applying a sealant to a 2000 sq. ft. home is $1200.00-$2000.00. If you took this same home and cleaned the roof every three years, your cost over 10 years (the limit of the sealers life) would be $600-$800. The cost does not outweigh the results when you consider the price of application.
Some companies offer a free sealant for the roof with every roof cleaning, which is similar to a carwash offering a free coat of spray on wax. As a general rule they offer no protection and usually won’t last longer than a week or so. There are a lot of misleading claims in roof cleaning. Beware of what you are being sold.