Professional Window Cleaners in Altrincham

What are the red streaks on my render? Have you noticed red streaks on render? Usually, the red streak is a type of algae called trentepohlia. While considered green algae, trentepohlia produces an orange/red pigment that impregnates and stains the rendered surface. They are usually in streaks simply due to gravity forcing the trentepohlia vertically down the wall. Red streaks on Render – Why do they appear? Modern renders look great on properties and walls. You can choose your colour, and the render won’t fade or need painting. However, they have been sold as maintenance-free, but in our mild and wet climate, this is only sometimes true. Modern render is soft and porous. Most houses have such good insulation trapping heat inside that there’s often no heat loss to help dry walls out. Shaded rendered walls can stay wet after rainfall for some considerable time. Prevailing winds carry algae spores which find a home in the damp and porous render. Once on your wall, they will continue to grow and spread until treated. Can red streaks be removed from my render? The short answer is yes, but it takes much work. A high-powered pressure washer will damage the soft render. Incorrect or badly mixed chemicals can cause unintended damage to your render, window frames, doors, surrounding plants, and wildlife. Red streaks are the most difficult to clean. This is because the red pigment penetrates the render and stains it like a dye.