Illustrative comparison; not a verified customer job.Why does K Rend go green?
Algae spores settle on outdoor surfaces. Places that stay damp and shaded, particularly near trees or badly draining gutters, can show green growth. Black or red patches may have different causes, and an inspection is needed before claiming they are all algae.
What does soft washing involve?
Soft washing generally uses low-pressure application of a treatment compatible with the particular finish. The operator may then rinse gently where the product instructions require it. It is not a promise that every surface can tolerate every cleaner.
- Inspect and document defects
- Identify the render system
- Protect nearby materials, planting and drainage
- Trial a discreet patch
- Apply a suitable method and document the result
Does K Rend permit gentle pressure washing?
Yes, on appropriate finishes K Rend’s official maintenance information permits a pressure washer with a mild detergent set to a low-power fan pattern. It cautions that very high pressure may damage render. The right setting and method depend on the exact material; dry dash and other systems may differ.
Can cleaning stop algae forever?
No. Even when a suitable biocide removes current growth, future shade, moisture and weather still affect re-growth. Be cautious of lifetime claims or a blanket ten-year guarantee that is not backed by written terms.
Check K Rend’s official maintenance guidance ↗ for your exact render.
Helpful answers from manufacturer and UK industry guidance
Short answers with links to check the supporting guidance.
Is K Rend a type of silicone render?
K Rend is a render manufacturer with a range of products, including silicone-based finishes. The exact product on a property matters because the permitted cleaning method and treatment may differ. A contractor should check the specification, if available, before choosing detergents or washing equipment.
Can water-repellent render still grow algae?
Yes. Water-repellent render can still develop surface algae where moisture lingers on a shaded façade. K Rend describes this discolouration as a natural appearance change associated with atmospheric spores, weathering and local conditions rather than proof that the render has failed.
Does K Rend need painting after it is cleaned?
Usually not just because it looks dirty. K Rend advises a gentle wash to refresh weathered render. Paint may be a separate decision where the finish is damaged or a colour change is wanted; cleaning should not be presented as a substitute for repairing an unsound surface.
Frequently Asked Questions
Is K Rend the same as silicone render?
K Rend is a brand offering several render products, including silicone-based systems. Not every silicone render is K Rend, and not every render has identical care requirements.
Does green render mean the wall has failed?
Not necessarily. Algae can be cosmetic, but leaks, cracks or debonding should be inspected separately.
Can cleaning restore the original colour?
Often the appearance improves, but staining, aged coatings and repairs can limit how uniform the finish looks.