Over time, roofing shingles can become breeding grounds for algae, moss, mould, and lichen, especially in humid or shaded areas. This microbial growth not only affects your roof’s appearance but can also compromise its structural integrity and shorten its lifespan. Understanding the risks and implementing effective mitigation strategies is essential for maintaining both the beauty and performance of your roof.
Why Microbial Growth Occurs on Shingles
Moisture retention is the primary trigger for microbial activity. Asphalt shingles, like Architectural Roofing Shingles and Premium Designer Shingles, may trap moisture under debris or in shaded areas, creating a perfect environment for spores to thrive. Poor ventilation, overhanging trees, and clogged gutters can accelerate the problem.
Risks of Microbial Growth
Aesthetic Damage: Dark streaks and patches caused by algae and mould can reduce curb appeal.
Surface Degradation: Moss and lichen can lift shingle edges, allowing water infiltration.
Reduced Energy Efficiency: Microbial stains absorb more heat, undermining the reflective qualities of cool roof shingles.
Health Concerns: Mould spores can impact indoor air quality if moisture penetrates the roof deck.
Mitigation Strategies
Algae-Resistant Shingles – Opt for shingles with copper or zinc granules, such as Dynasty Roofing Shingles, which naturally inhibit microbial growth.
Proper Roof Ventilation – Ensure adequate airflow under the shingles to keep the roof deck dry.
Regular Cleaning – Use low-pressure washing with mild, eco-friendly cleaners to remove moss and algae without damaging the shingle surface.
Metal Strips at Ridge Lines – Install copper or zinc strips along ridges; rainwater will carry these ions down the roof, preventing growth.
Gutter Maintenance – Clear debris to avoid water pooling at the roof edge.
Professional Solutions from Scaffs India
At Scaffs India, we recommend preventive measures at the time of installation, including moisture control layers and selecting shingles designed for the local climate. Our range of roofing accessories works alongside shingles to protect against microbial damage and extend roof life.