mold and algae

Mold and algae look very similar when seen on a roof, yet they have completely different effects. Roof contractor Achten’s Quality Roofing shares an in-depth look at the differences between mold and algae and how you can eliminate them from your roof. Mold and Algae Look Almost the Same When seen from the ground, mold and algae both look like black growths that grow on wet spots. They both grow from airborne spores, they spread quickly, and they form dark stains that look obvious especially on...