Render & Roughcast Cleaning
in East Kilbride
Restore your home's exterior walls. We safely remove algae, moss, lichen, and black staining from rendered and roughcast surfaces across East Kilbride and the surrounding areas.
Why Rendered Walls
Need Specialist Cleaning
Render and roughcast are extremely common exterior wall finishes in Scotland, but they are particularly susceptible to algae, moss, and black algae staining in our damp climate. These biological growths not only look unsightly but trap moisture against the surface, accelerating deterioration.
Unlike brick or stone, rendered and roughcast surfaces cannot be pressure washed at high pressure - this would damage the texture and could cause the render to crack or delaminate. Instead, we use a specialist soft wash technique: low-pressure application of a biocide treatment that kills biological growth at the root, followed by a gentle rinse.
The result is a thorough, long-lasting clean that restores your walls to their original colour without any risk of damage.
Common Problems on Rendered Walls
Green Algae & Moss
Green discolouration caused by algae and moss is the most common issue on rendered walls in Scotland. It builds up rapidly in shaded, north-facing areas and holds moisture against the surface.
Black Algae Staining
Black streaking and staining is caused by Gloeocapsa magma - a stubborn algae species that embeds itself into the surface. It's particularly difficult to remove without specialist treatment.
Lichen
Lichen is a slow-growing but deeply embedded organism. Once established, it can only be effectively removed with biocide treatment - scrubbing alone won't tackle the root growth.
General Grime & Discolouration
Airborne dirt, pollution deposits, and weathering discolour rendered walls over time. Our soft wash process removes surface grime and restores the original finish.
How We Clean Render & Roughcast
Surface Inspection
We inspect your walls to assess the type and extent of biological growth, identify any damaged areas, and determine the appropriate biocide concentration and application method.
Biocide Treatment
We apply an eco-friendly biocide solution at low pressure across all affected surfaces. This kills algae, moss, lichen, and black algae at the root, penetrating deep into the surface texture.
Rinse & Finish
After the biocide has done its work, we rinse the walls clean at low pressure, revealing the restored surface beneath. We carry out a final inspection to ensure a consistent, complete result.
Render & Roughcast Cleaning FAQs
Yes - using the correct soft wash technique. High-pressure washing is not suitable as it can damage the surface, but our low-pressure biocide application achieves excellent results without any risk to the render or roughcast.
Green discolouration is caused by algae and moss growth, which thrives in Scotland's damp climate. Black staining is caused by Gloeocapsa magma - a specific algae species. Both are effectively treated with biocide and soft washing.
After a professional clean with biocide treatment, results typically last 2–4 years. North-facing and heavily shaded walls may need more frequent attention due to the increased moisture and reduced sunlight.
Yes - our soft wash technique is safe for K-rend, monocouche, coloured render, and traditional roughcast. We use product concentrations and pressures appropriate to each render type to ensure a safe, effective clean.