Thanks for your reply. Here's another picture of the side of the house which might give you a clearer idea. I don't understand why the markings are so high up and why its forming in this rectangular pattern. But you are right, it's not been painted, the company said the coloured render they were...
I'm not actually a plasterer, I just came here hoping for some advice. We had a solid wall insulation system applied to the side of our house 6 years ago. It was rendered with a silicone-based render before painting. This winter regular, rectangular staining has appeared on the surface. Would...
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