I found this problem during a home inspection in Baltimore yesterday. This was not viewable from the ground. It’s an easy repair now but not so easy once winter arrived and the melting snow backed up the valley and started
Why are there blackish streaks on my asphalt roof shingles?
Ugly black stains on roof shingles are frequently mistaken for fungus, mildew, dirt or oil, but are in fact caused by a resilient type of algae. This common problem has Increased during the past 20 years and it is showing