Should moss be removed from roofs, and what removes it?
Short answer. Yes, moss should be removed from roofs because it traps moisture and lifts shingles, shortening the roof's life. What removes it safely is a roof labeled moss killer (zinc sulfate, soap based, quaternary ammonium, or diluted bleach), followed by gentle removal of the dead moss and prevention to stop regrowth.
The case for removing it
- Moss keeps shingles damp, which accelerates aging and rot.
- It grows into joints and lifts shingle edges, breaking the seal.
- It sheds into gutters and causes overflows.
- It makes roofs dangerously slippery for anyone working on them.
What removes moss
- Zinc sulfate powder or granules: slow but long lasting.
- Soap based sprays: fast on visible moss.
- Quaternary ammonium spray and leave products: no scrubbing; rain removes dead growth.
- Diluted household bleach: immediate kill and stain removal; needs plant care.
- Gentle removal: gloved hands, soft brushes, blunt plastic tools, and rain.
What removes moss and damages the roof
- Pressure washing: blasts off granules and drives water under shingles.
- Metal scrapers and wire brushes: tear granules and seal strips.
- Prying live moss: lifts shingle edges.
Who should do it
Homeowners can treat low, gentle roofs from a ladder. Steep, high or brittle roofs are better left to professionals who use treatment and soft wash methods. Ask any contractor how they remove moss; if the answer involves a pressure washer, keep looking.
Stopping regrowth
Let in sun, clear debris every fall, and add zinc or copper strips. See moss and lichen on roofs, trees and your roof and the Georgia maintenance checklist.