Why Is My Roof Dirty?
The Truth Behind Roof Stains
In the 1980's Asphalt Roofing Manufacturers began to use limestone as a filler to combat rising oil prices. So to cut down on the amount of oil used limestone was used as a filler in asphalt shingles. There's just one problem with that idea. Limestone is made from calcium and bacteria can use it as a food source. One in particular named Gloeocapsa Magma is what plagues most roofs with black staining. Because this bacteria is airborne it affects many homes. When it lands on a roof and the conditions are right and a food source is present. You will have black stains in due time. This process generally takes 5-7 years with our Delaware climate depending on many factors. One major factor is the quality of your shingle. Some lower quality shingles will have visible staining in 3 years. Older shingles, before the addition of limestone rarely become dirty. Shade is another major factor. Roofs below substantial tree cover are more likely to develop staining as well.
Do I Need To Clean My Roof?
Unfortunately roof cleaning is the price to pay for cheaper and more sustainable shingles. If roofs are left uncleaned they will have a shorter life cycle. Roof stains aren't just ugly they are damaging your roof. The bacteria is literally eating your roof and as a result of digestion it also leaves behind acid. These two in harmony can make your roof brittle and help to lose granules faster. After a roof is left with the bacteria moss and lichen begin to take hold these two cause even further damage with their root systems. Roof cleaning is a necessary to protect your roof from damage. The boost in curb appeal is just a bonus.
Do Something About it
Set up an appointment with a roof cleaning specialist today!