WHY DOES MY RENDER LOOK DIRTY?

All render is prone to discoloration over time. The time frame in which discolouration occurs is dependent on multiple factors:

́ Location – close to roads, local industry, dense woodland, or other environmental impacts

́ Weather – wind and rain, particularly in high exposure and coastal locations

́ Facades that are sheltered from direct sunlight can remain damp over long periods of time so will be more susceptible to organic growth such as algae, mould, moss and fungi

It is important to note that if your render is not damaged or cracked then dirt or algae growth, etc., is purely a cosmetic issue and will not cause any long-term problems to the integrity of the façade.

When To Clean

Typically, the property façade will need cleaning every two years to maintain its appearance. During this time, pollutants, organic growth and other unsightly material can attach itself to the render, all of which can easily be removed.

How To Clean

Render can be cleaned simply with fresh, clean water, ideally through a hosepipe. Pressure washers can be used but they should be set on the lowest possible setting as high pressure could damage the render you are trying to revive. If a pressure washer is used, ensure the machine is set to fan,not jet and spray at a distance no closer than 1.5m away.

You may use a low concentration of a mild, nonabrasive cleaning agent and carefully clean the façade in a controlled manner working downwards from the top of the property.

Sika® MouldBuster can be used to remove algae from affected substrates and is readily available from most builders’ merchants.

Sika® MouldBuster is a powerful, fast acting solution which is effective on most surfaces. It removes algae, mould and green growth without the need for scrubbing or pressure washing – please refer to the product data sheet for more information and guidance on using the product.