Roof Stain Origin
Roof stains come from "cyano bacteria gloeocapsa magma" landing on roof shingles and tiles.
Roof Algae feeds on crushed limestone in the shingles.
Fungus, mold and mildew grow on top of the roof algae
Over time, the algae multiplies and the black streaks, Roof streaks or mold stains appear signaling roof cleaning should be performed.
Roof Stains Algae Survival
Algae roof stains need: Heat, moisture, and nutrients.
Algae roof stains get heat from the sun
Algae roof stains get moisture from rain and dew
Algae roof stains nutrients come from limestone filler in the roof shingles
Roof Stain Rapid Spread
Roof algae, mold, mildew and lichen grow and hold moisture accelerating growth.
Black roof streaks and roof stains spread wider and darker over time.
Extreme temperatures won't prevent the spread of black streaks or roof stains.
When to clean Roof Stains ?
First sign of Black Streaks, Black stains, or missing granules means clean the roof!
Not cleaning the roof shortens roof shingle life and raises cooling costs because the black streaks absorb sunlight.
