Moss and lichen love to grow on clay tiles, so why is it important to remove it, especially as some people say “it adds character to the roof"?.
Moss is a flowerless plant that grows in clumps and lichen is actually two organisms that coexist, fungus and algae as one to the mutual benefit of both organisms (symbiosis).
Clay tiles seems to be a favourable substrate for both moss and lichen to grow, both of which favour damp conditions.
The reasons we need to remove this growth from the tiles are two-fold. Firstly the flow of water down the tiles surface is impeded and in heavy rainfall water is not shed from the roof as efficiently and can lead to leak problems, especially on lower pitch roofs when the drainage channels between the tiles becomes obstructed.
Secondly, these organisms retain moisture, causing the tile to remain damp for longer which leads to increased moisture penetration of the tile and accelerated breakdown of the clay (tile fretting).
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