Renders are a long-term durable solution for any building but they’re not fully immune to damage that can be caused by a few external factors. For example, mud stains or algae build-up due to environmental conditions.

We highly recommend that every JUB system installed is to be inspected by the installer once completed. In 30 days after completion, the client should then do a follow-up inspection to ensure standards have been met. 

Once a year the client should do a check for any further changes that might have occurred.

Pro Tip: Don’t forget to also check all window and door seals annually.

If you notice any changes to the façade or render of the building, you should notify our team and installer with photographic evidence. 

Cleaning render is quite straightforward and can be easily done as long as not too much pressure is applied. As soon as you notice dirt forming on the external render, you should take action. Our JUB render finishes can be cleaned by using water-compatible household cleaners and soft, non-metallic bristle brushes. 

You will find a variety of products on the market, which are specifically manufactured for the use of cleaning render. 

The best solution would be pressure washing the façade. (Pressure should not exceed 1000 psi.) Also, you should keep the washer at least 12 inches away from the render. Keep the washer moving along the façade. 

Mud stains can prove to be difficult to clean since render finishes are not stain-resistant. Never scrub the stain aggressively since that can deal irreversible damage. We highly recommend starting by cleaning a small part of the façade. 

Pro Tip: Cleaning render will only work when the dirt or stains sit on top of the surface and aren’t embedded within the textured finish.

Other difficulties you can face is algae, mould or moss forming on the render finish. These can be a lot more stubborn to deal with and need specially manufactured cleaning render products. 

Even though our JUB renders are treated with biocides to prevent this from happening, it is common to see buildings with north-facing, damp walls, within coastal regions or areas of greenery experience algae stains. 

The most important thing to do once you have noticed this type of build-up is to act fast. Algae can spread quickly if left untreated and it will continue to grow as time passes. Algae is usually green, black or red.

As a render company, JUB offers a specialised product that tackles render that has been affected by algae. If you would like to know more about the product and its use, you can contact the JUB technical department.

For any other general enquiries, don’t hesitate to contact our office on 0845 688 9866.

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