How often should I clean my roof?
Short answer. Clear debris from the roof and gutters at least twice a year, more often under pine trees, but only wash the roof surface when algae or moss actually appears, which on shaded Georgia roofs may be every few years. Frequent washing is not needed and, done wrong, shortens shingle life.
A practical cleaning schedule
- Gutters and downspouts: spring and late fall at minimum. Under pines or big hardwoods, three or four times a year.
- Valleys and behind chimneys: whenever needles and leaves collect, since these spots trap water.
- Algae streaks: wash only when they appear and bother you, often every few years on shaded slopes.
- Moss: treat at the first sign of green cushions rather than waiting for mats.
Safe methods
- Blow or brush loose debris off a dry roof only if it is safe to reach; otherwise hire it out.
- For algae, a low pressure wash with a diluted bleach based or oxygen bleach cleaner, rinsed with a garden hose.
- For moss, a moss specific treatment, then let rain carry it off.
- Never pressure wash shingles.
Signs you are cleaning too often or too hard
Granules piling in gutters after each cleaning, patchy or shiny areas on the shingles, or lifted edges. Those mean the cleaning is removing roof along with the dirt.
Reduce how often you need to clean
Trim branches back from the roof, add gutter guards suited to pine needles, and choose algae resistant shingles at the next replacement. See pine needles and leaves on the roof and gutter sizing and guards.