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Joe-90 - guess you didn't actually read what I wrote. Anyway, the house is really tall and the algae grows back in 6 months. Should I just hire a cherry picker twice a year? Bosswhite - thanks for your input. The difficulty with your solution is that I haven't been able to find a decorator...

Yes, it was there when he first came. I can't remember if it was me or one of his guys who pulled most of it off, but they cleaned up the rooty bits which were still attached when they prepared the wall before painting.

Sorry, not clear why you would think a small patch of ivy (less than a square meter) would cause algal growth over more than 20 square meters of wall. Not looking for someone to blame here, but trying to understand why the growth is thriving on this particular paint so that I can find a...

Ivy grew up there in one area after the paint was applied - what you can see is a bit of root I hadn't pulled off. This is not related to the orange growth though, which is all over the wall. It's not to do with damp in the wall, either, because where the paint was applied on a plastic pipe the...

This orange staining (probably trentepohlia algae) started to appear on my house around 6 months after painting with Macphersons Powerkote. My decorator uses this paint a lot and has no idea why this has happened. The paint manufacturer puts the problem down to our rural environment/global...