A roof that looks this bad needs a whole lot of help. But in less severe cases, sometimes shingle discoloration is merely a sign of algae.
A roof that looks this bad needs a whole lot of help. But in less severe cases, sometimes shingle discoloration is merely a sign of algae. File illustration MCT
A roof that looks this bad needs a whole lot of help. But in less severe cases, sometimes shingle discoloration is merely a sign of algae. File illustration MCT

What causes dark streaks on roof shingles and how to fix it

June 10, 2016 10:00 AM