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Algae growth on render (the exterior surface coating of buildings) can be problematic for several reasons:


Aesthetic Degradation
Algae can cause unsightly green, brown, or black discolorations on building surfaces, affecting the overall appearance and reducing the curb appeal.
Structural Damage
Algae retain moisture, which can lead to the degradation of the render over time. This moisture can penetrate small cracks and crevices, freeze and thaw cycles can exacerbate the damage, causing the render to crack or deteriorate.
Health Concerns
Algae can contribute to the growth of mold and mildew, which can be harmful to human health, especially for individuals with respiratory issues or allergies.
Slip Hazard
On surfaces like walkways or stairs, algae can become slippery when wet, increasing the risk of slips and falls.
Maintenance Costs
Regular cleaning and treatment are required to remove algae, which can be costly and time-consuming.
Preventing algae growth involves ensuring good drainage, reducing surface moisture, and applying treatments or coatings that inhibit algae development.
In this example of a render clean in Lydiate, liverpool. You’ll see how the green algae can be dominant colour. Red algae (trentepholia) can also be seen and these are a little more stubborn to remove. 
With a carefully planned softwashing method and environment process to protect plant life etc, we set about safely removing the growth without damaging the surface. 
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