Bungalow, back end south facing. I was unhappily on the roof about 5 years
ago scrapping and brushing the moss off. The tiles are very rough and are
like steel.
I'd read that stringing a length of copper wire over the ridge kills moss,
so I did it. The moss returned on the back end of the roof, never mind and
******** to it, I'm not going up there again. Since Autumn chunks of moss
have been falling down almost every day. Maybe the copper wire takes time to
work?