On 22/12/2019 21:10, Mr Pounder Esquire wrote:
Fredxx wrote:
On 22/12/2019 19:34:30, Mr Pounder Esquire wrote:
Caecilius wrote:
On Sun, 22 Dec 2019 17:28:28 -0000, "Mr Pounder Esquire"
wrote:

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?

The best thing I've found for killing moss is benzalkonium chloride.
It's the active ingrident in most patio and decking treatments, but
is available much more cheaply as "BAC 50".

I buy 5 litres each year, which is enough to treat my drive at
patio. I've not tried it on my roof yet though.

No moss on the drive. I'm too bloody old to climb back on that roof
again.

A decent spray might get far enough

Maybe next year if I'm still around. I would have thought the sun would have
killed the moss. The north facing roof is fine.


I don't sun it makes much difference. Our road runs, more or less,
North/South and most houses on our side have the roofs parallel to the
road. One 'face' gets the morning sun but some houses are shaded by tall
trees. The West side isn't shaded and gets the afternoon sun.

We used to be (more) shaded at the front (east side) but some trees were
removed (long story). From my roof I can see several nearby roofs on the
west side and the east side roofs are easy to see from the road due to
the lay of the land (the side of a hill).

To the eye, moss growth is about the same on both sides, certainly on
our house and the nearby ones. The front of ours was recently cleared,
the back will be done when the weather permits. I did it some years
back*, hopefully I won't need to do it again for some years!

*Last time I just brushed it, this time it was power washed. I'm
considering applying something like 'wet and forget' or similar.