Moss that is left untreated can cause serious issues. Over time, moss can erode tiles and slate The example shows a beautiful roof with artificial tiles, which has been left for the moss to take a full hold. Once the moss is present in the channels of the tile, it holds the moisture, keeps the roof wetter and increases the damage.The other picture shows the distinct white lines on each tile where the moss has eaten away. The lines show the concrete fibre underneath. Most damage occurs during the winter months when the moss has absorbed water and then this seeps inbetween slate and tiles. This can cause the issue of ice forming and cracks appearing. Wet moss can be up to 5 times heavier and frozen moss over winter can cause brittle tiles.
Bear in mind also that we are noticing a distinct increase in moss removal showing up on house surveys when selling/purchasing so best to remove it before.
We can take a video document for each customer which can show the roof pre-treatment. This can give you an idea of the condition of your roof although the full extent of any damage can only be seen once removed