Does Moss Damage Roof Tiles in UK Weather?

Moss causes real, progressive damage to roof tiles in the UK. The mechanism is straightforward: retained moisture, freeze-thaw cycles and physical lifting.

How moss damages tiles

Moss holds water against the tile surface long after rainfall ends. In winter, that water freezes overnight and expands, fracturing the cementitious surface coating on concrete tiles.

• Surface erosion of concrete tiles
• Tile lifting where moss roots into laps
• Gutter blockage from moss fragments
• Water ingress under tile laps

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