With modern render the surface is porous and soft. All properties look amazing when first built and the render substrate has been apply. The product has been sold as maintenance free which is totally untrue due to the British weather which is a very wet climate.
Properties with shaded rendered walls, close to trees and walls will be affected the most. Walls that always stays wet and never dry out will be affected the most.
Green algae is the first most common algae that will appear on the render surface. In due time red algae will start to appear which is Trentepohlia.
Red staining on render will rapidly spread across the wall surface due to being so porous. Trentepohlia can damage the surface of the render substrate if left and not cleaned by a professional render cleaner.
Best ways to clean red stains on render
In the first instance you have to understand what contamination you have on the surface you are going to clean. Applying wrong chemicals can discolour and damage the surface or using incorrect pressure will totally destroy the surface worked on. Our approach to a more gentle cleaning method is using soft washing at low pressure cleaning method, with a solution of chemicals mixed at the correct dosage for the job to be done. Some cleaning jobs will have different mixes of cleaning solutions to different strengths depending on the contamination. Red stains on render is easy to clean if done correctly.
Low pressure steam cleaning
With all render cleaning jobs , our process is to clean the surface using our steam cleaning technology at about 30 – 40 bar using steam at 100 – 150 Degrees to gently clean, removing algae deposits and dirt.
Soft washing low pressure steam cleaning done by an experienced exterior cleaning company will rejuvenate your rendered walls to look like new again.
