On 24/05/2017 10:28, AnthonyL wrote:

Are the two related?


The moss would probably block most natural ventilation through the
gaps/joins in the tiles and act as a sponge making the roof wet most of
the time.

Before cleaning off the moss try spraying it with a water/copper
sulphate mix to kill it. My neighbour had some success cleaning moss
using a stiff bristle hand brush.

Ebay for copper sulphate, google for water copper sulphate mix.

http://www.wilko.com/brooms+dusters/...h/invt/0230886


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