Is it something to do with the direction it faces, possibley north and therefore never really gets a good drying out as it wouldn't get as much sun? Think you see it occuring on more northly facing surfaces anyway, something like that.
Run a copper wire along the top, copper oxide is a poison to moss and kills it. Everytime it rains the copperwire will create more copper oxide that runs it down the roof/tiles/slope. No need for chemicals, no need for professionals, no need for maintainence.
Run a copper wire along the top, copper oxide is a poison to moss and kills it. Everytime it rains the copperwire will create more copper oxide that runs it down the roof/tiles/slope. No need for chemicals, no need for professionals, no need for maintainence.
Nuke from orbit, tis the only way to make sure its gone, or bleach. Stone always seems to crumble when its been painted for some reason, id get it sandblasted then treat it with silicone.
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