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CYOA-
Apparently you can install a strip of copper or zinc along the roof ridge and chemicals which run off when it rains prevents growth. Pro tips here.
Timmy2wheels
Has anyone had their brick house rendered? Thinking about doing ours, not because the brickwork is in bad shape, but for aesthetic reasons. Sand and cement vs monocouche? Any issues to think about? And would the keeping existing concrete tiled roof, covered in lichen and moss, ruin everything? MANY QUESTIONS.