20/04/2026
Lichen is a symbiotic organism (fungus and algae) that grows on roofs, appearing as crusty, scaly patches of green, grey, or white.
It thrives on roofs due to high moisture, shade, accumulated debris, and porous roofing materials.
Lichen damages roofs by creating root-like structures that hold water, leading to deterioration and the destruction of granules.
Why does it grow on Roofs?
Moisture & Humidity: Damp, shaded, or cold environments provide the ideal conditions, especially on north-facing roofs that stay wet longer.
Organic Debris: Leaves, twigs, and tree debris accumulate, providing nutrients and retaining moisture that encourages growth.
Porous Roofing Materials: Asphalt shingles, concrete, and clay tiles are susceptible, offering a secure, stable surface for growth.
Airborne Spores: Spores land on the roof via wind, allowing them to take root in the dirt and grime.
Why it causes damage to roofs
Water Retention: It acts like a sponge, keeping the roof constantly wet, which promotes rot and further growth.
Reduced Lifespan: If left untreated, lichen can significantly shorten the life of a roof.
Core Benefits of Soft Washing
Root-Level Elimination:
Soft washing uses specialised chemical treatment that pe*****te surfaces to destroy lichen roots and spores.
Surface Protection:
It uses low pressure, typically under 500 PSI, similar to a garden hose, which prevents damage to delicate materials like roof tiles, sandstone, slate, corrination, and aged stone that high-pressure cleaning can crack or erode.
Long-Lasting Results:
Because the treatment sterilises the surface, it can last up to 5 years depending on the roof tile, environment and integrity of the roof. Which is significantly longer than the 6 to 12 months often seen with pressure washing.
Contact us on 0834727307 for a free of charge quotation
We service Port Elizabeth and East London, including the surrounding suburbs