When and how should I remove moss from my roof?
Short answer. Remove roof moss as soon as you notice it, using a treatment applied during a dry window in fall, winter or spring when moss is actively growing, then removing it gently once it dies. Removal protects the shingles from trapped moisture and lifting, and early treatment is much easier than clearing thick mats later.
Why remove it
Moss holds water against the roof, grows between shingle courses, and lifts edges so wind and rain get underneath. The longer it stays, the more granules it takes with it. See moss and lichen on roofs.
When to remove it
- Best seasons in Georgia: fall through spring, when moss is moist and actively growing so treatments soak in, and temperatures are mild enough that solutions do not flash dry.
- Best days: dry, calm, overcast, with no rain forecast for the time the label requires.
- Avoid: the hottest summer afternoons, freezing days, and right before storms.
- After fall leaf drop: clear debris first, then treat.
How to remove it
- Clear leaves and pine needles from the roof and gutters.
- Protect plants under the eaves.
- Apply a roof labeled moss killer from a ladder at the eaves.
- Wait for the moss to brown and loosen.
- Remove it by hand, soft brush or blunt plastic tool, downslope only, and let rain rinse the rest.
- Scoop debris out of the gutters.
What not to do
- Pressure wash or scrape live moss.
- Walk on treated, wet or mossy shingles.
Afterward
Look for lifted or bald shingles where the moss was, and add prevention such as zinc or copper strips. See the Georgia roof maintenance checklist and trees and your roof.