Here on the wet coast of BC, moss forming on roofs is a common
One of the local roofing contractors spreads powdered laundry soap on
the peaks of roofs as a means of killing moss. The rains eventually
wash the soap away.
My roof is new and I which to protect it . Does this procedure
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Yeah, but it'll grow back eventually. Moss and sun don't mix, so most
people with mossy roof probalems usually do no-cost stuff like prune
back the tress around the house that block the sun from naturally drying
your shingles. More sun, dry shingles, no moss.
Nature's balance is pretty simple and it doesn't cost a thing or require
you to climb a ladder.
Don't like the sound of laundry soap, sounds like a prescription for
slipping/falling off the roof. For a new roof, I used a 10 inch wide zinc
metal strip near the top of the roof. I am monitoring effectiveness, after a
year it has very little moss. Can also use a Moss-Away compound spray avail.
at Home Depot. It is a zinc salt of some kind. You use a pump sprayer to
apply it, but being liquid, it works best when there is already moss around.
There is also a mechanical approach - trim trees, as suggested, or just go
up there from time to time and sweep off the moss with a stiff-bristle
broom. Also, keep roof free of tree debris, that shades and feeds moss.
(ex: Tide w/bleach).
You could just use bleach. Chlorine bleach is very alkaline. It
may not be good for the roof, but it supposedly does kill moss.
The commercial zinc products would be a better bet. I get the
powdered stuff from the garden dept. and sprinkle some on the
roof each year.
You can install zinc, copper, or any other metal strips near the top.
I did this on my new roof 13 years ago and it does work! But, I heard
it only works on new roofs--after the moss or algae starts growing it
has little effect. It has something to do with metal ions covering
the roof. One product is "Shingle Guard." Ask about it at your local
hardware store or DIY.
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