This goes for the corrugated sheets as well. Normal terracotta roofs don’t have this much moss/lichens.

  • SubArcticTundra@lemmy.mlOP
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    2 hours ago

    many terracotta roofs are glazed and have a much smoother surface.

    Ah, that might very well be it. You’re right, ethernit does seem to have a rough surface, which would make it a much easier surface for moss and lichens to grow on.