- Joined
- May 22, 2015
- Professional Status
- Certified Residential Appraiser
- State
- Pennsylvania
I have never heard of algae on the roof. You get algae growth in a sitting half empty swimming pool after a while. But a roof, you sure the pitch and drain are working. Come to think about it, i have seen some algae on those asbestos house shingles long ago. And on some stucco. How can the algae survive on a hot tin roof.