Modern colour through renders are great in most respects. They add instant colour to a building, give it smooth modern lines and are virtually maintenance free.

The term “virtually maintenance free” is where the problem lies with these modern building coatings. I have yet to find a surface finish that will maintain its appearance in our wet but mild climate without some form of care or cleaning. Even the so called “self cleaning glass” fails to keep naturally clean and requires periodic washing with pure water.

So back to the question in the title, why is my render going red? Take a walk in to the countryside and you will see on any rock face or man-made wall, colonies of red and green algae, lichens and mosses. These organisms build upon one another in a symbiotic relationship and they find our building exteriors a perfect representation of their natural habitat. Our homes and work places have always had these organisms present to some degree, but older finishes such as brick do not show them easily unlike the pastel shades of render.

We have reached a perfect storm with the problem of colonisation by red and green algae making buildings look unsightly and an increased need for render cleaning and maintenance programs. Modern renders such as K-rend, Monouche and Sto have a textured and somewhat porous surface profile. This allows rain water to remain present on the surface for longer and when combined with improved air quality and increased insulation values being installed in to buildings which prevent heat loss through the walls, this in turn slows down the exterior drying process.

Thus the perfect environment for red algae to thrive is created and the unsightly red algae staining that is seen all around the country takes hold. This combined with the miss selling of “maintenance free” means our cities and towns are turning red. Render cleaning using the low pressure softwash method is the perfect solution to this modern problem, if you would like to know more on how we can clean your render please click the link.