Red stains on render

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  • Post published:April 16, 2017
  • Post category:More Information
  • Post last modified:December 5, 2022

Red stains on your render?

image of before and after cleaning of red stains on render lake district

Red stains on  k rend render, this is a type of Algae  that grows within the render on  buildings. These  Algaes  can damage the render on the building if left to there own devices. These microorganisms grow by extracting the energy from sunlight and carbon dioxide from the atmosphere. In a damp environment, the formation of these microorganisms or biofilm as it is called  really flourish.The rendered surface of the building needs  proper treatment from a  render cleaning company.Cleaning service ltd specialises in the treatment and cleaning of all types of rendered surfaces  Here is a guide to  the microorganisms that may destroy the render on the surface of these buildings.

Fungi: usually a black stain

The formation of Chemoorganotrophic fungi is generally seen on the stone crusts. By bio-corrosive activity or hypnal growth these types of fungi penetrate in the render. This happens because of the excretion of organic acids and the oxidation of mineral forming cations like manganese or iron. It causes discoloration of stone surfaces and can leave “rust like stains” as well.


Mosses are non vascular plants that need access to nutrients and good amount of moisture to develop. They make use of sunlight to make food using photosynthesis. On a rooftop where there is moist environment and is also shaded with the help of tress develops mosses. These grow mostly in winter and in summers it dries out leaving stains of brown colour. These add weight to the roof and it also falls down in gutters and pipes causing blockages.

Algae and cyanobacteria:

These can grow on the stone surfaces and also penetrate in the stone system. Algae and cyanobacteria causes a lot of pigmentation which leaches into the substrate on which it is developing. In cold temperature with high level of rainfall as well as humidity, the growth of algae in different species is found.

Treatment of such types of contaminants and bacteria:           

So, there are many more contaminants which can cause lot of damage, discoloration and stains to the render surfaces.Cleaning service ltd  applies a biocidal wash to get rid of them. The treatment plan may differ for each of these types. The treatment with a boi-cide wash is certainly important but sometimes, the need to scrub and brush these kinds of microorganisms is crucial too.

Most Black marks are Fungal this can be removed from the sand stones and other kinds of stones in residential as well as commercial areas. The species are killed and depending on the weather the treatment is performed to give a beautiful new look to the buildings that are stain and bacteria free.

Cleaning-service Uk can remove red stains on render ..if you have a problem with red stains on render call us today on 080000933267 for free advice