Leaves are a constant source of headache for roofers and a constant source of problem for all roofing types; especially for tiled roofs. Tile roofing seems to be the worst affected due to the access leaves have to valleys and gutters.
Have a look at the pictures below, this is a great example of a flat tiled roof having problems with leaves blowing up under the tiles.
The problem arises because once the rain has come and the leaves are blocking the gutters the water then has nowhere to go. The water builds up in the gutters and spills over into eave lines. The leaves turn into a thick mulch which also builds up causing dams and starts forcing the water into the roof cavity thus causing not only external damage like rotting gutters and down pipes and in some cases blocking drainage, but internal damage as well as shown in the last picture above.
This is a reminder how important it is to have checks and maintenance done on your roof regularly.
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