Probably not. Many roofs can have the algae and discoloration removed using our low impact cleaners and treatments, returning them to a newer-looking appearance without damage. In the old days, shingles were replaced because the tar dried up and the shingles become brittle and leaks would begin to occur. But this usually only happened twenty five or more years after the shingles were installed. A proper roof cleaning can help you shingle roof get the long life span it was designed to have.
