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Why Roof Tiles Turn Green and How to Treat Them

Why Roof Tiles Turn Green and How to Treat Them

By Mark Cave July 04, 2026 |

Why Roof Tiles Turn Green Roof tiles turn green because moisture, shade and airborne biological spores create the right conditions for algae, moss, lichen and other organic growth to colonise the tile surface. In the UK, this is especially common on north-facing roof slopes, shaded properties, roofs under trees, and...

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