Moss and Algae Growth
Black streaks from algae (Gloeocapsa magma) and green moss mats are not just cosmetic issues. Moss holds moisture against the roof surface, accelerating shingle degradation. Algae staining indicates a moisture-friendly environment that may point to ventilation deficiencies.
Symptoms to Look For
- Black streaks running vertically down the roof face
- Green or brown moss mats, especially on north-facing slopes
- Shingle granules accumulating in gutters despite no storm damage
- Premature shingle aging in shaded areas
Common Causes
- Overhanging trees blocking sunlight and retaining moisture
- Inadequate roof ventilation keeping the deck warm and damp
- High-humidity microclimate from proximity to lakes, streams, or wetlands
- Older shingles without algae-resistant granule treatment
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Repair or Replace?
Moss and algae can be treated with zinc or copper sulfate solutions and removed with low-pressure washing, never high-pressure, which blasts granules off the surface. Long-term prevention involves trimming overhanging branches, improving ventilation, and specifying algae-resistant shingles at replacement.
Moss and Algae Growth in northeastern Pennsylvania
Moss and algae are pervasive in Pike and Wayne Counties where dense forest canopy keeps roofs shaded and damp. Lake-community homes near Wallenpaupack, Ariel, and the Delaware River communities are especially affected. It's worth treating before a sale, as it affects curb appeal and can cause inspectors to flag the roof.
Areas Where We Fix Moss and Algae Growth
Dealing with Moss and Algae Growth?
Don't wait. Call ShingleMe for a free inspection, we'll diagnose the problem and give you a straight answer.