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I have lichen growing on my porch roof. The #1 cedar shingles are about 13-15 years old. The pitch is 5/12 and the only place I have lichen is on this north roof. There is a tree in the area. The main house is 12/12.
See pics.
Can someone advise me on the best way to treat this. I saw these items on amazon an the attachment. I couldn’t get them to cut and paste well.
Thank You
Rich
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Replies
I've got a 20 year-old gazebo with cedar shingles. I find algae growth on that roof as well, usually in the spring. Once the hot temperatures arrive the algae generally goes away. I've heard that a weak solution of bleech and water brushed on to the cedar will be rid of the algae for a period of time but I haven't tried it myself.
Chip
Chip
I did a search a while back and read some threads on cedar decks and cedar roofs.
Bleach was mentioned as being really hard on the wood, removing the natural tannins.
An algaecide was recommended but no product name was mentioned.
Rich
I grew up in Washington State, moss and algae are always a problem. My dad always put a narrow copper strip under the top course of shingles with about 1/2" exposed to prevent algae & moss. When I moved into my new house, the first thing I did was get a zinc plated strip (can't afford copper these days) and tuck it under the top course. Never had a problem. It's easier to prevent than cure.
Ray
I have a galvanized ridge cap. But it is not enough.
Generally any galvanized metal will leach enough zinc to stop algae.
Old barns with a cupalo have nearly perfect shingles directly below the cupalo, while the rest of the roof is going bad.
Thanks for the tip.
The first choice in the attachment is a zinc coated metal that goes along the ridge.
Rich
A real drastic solution is to get rid of the trees that are shading the roof :-(
Ray
The tree in the picture is the on over the roof.
It's not exactly over powering or low hanging.
Rich
here's a good tip, copper along the ridge will stop algae from growing. put a copper cap on, and when it rains, some minerals or someting or the other will wash down and PREVENT algae
http://www.youtube.com/watch?v=G93vvGutaLs&feature=user
there's no need to reinvent the wrench
Edited 4/26/2008 6:39 pm ET by andyfew322
andy
It's the zinc that leaches of the galvanizing that stops algae growth.
I have a galvanized ridge cap but it is not doing it.
The ist product in the attachment is zinc coated strip.
Thanks for the tip.
I will look at the utube link after supper.
Rich
http://www.homebaseexpo.com.au/building/harrys_hints/articles/removing_roof_moss.html
HootOwl
Thanks.
I'll look for that at the hardware store.
Rich
Sometimes you'll also find it at a greenhouse or agricultural fertilizer supply.
Sprinkle Tide clothes detergent across the roof.
Kills the moss and algae.
dovetail
Why does Tide detergent kill moss and algae?
Does it hurt the cedar?
That's my main concern. I don't want to rashly go out and put something on there that will damage the wood.
Rich
I really don't know why or how it works. I actually would be interested to learn why . I should have cautioned that I have no experience with it on cedar roofs. I suppose it might be possible that it would wash the oils out of the cedar. "bobbys" has also heard of this and uses it I think. Might shout out to him and see if he has experience with it on cedar.I do use it and have used it on asphalt roofs. I started doing it at the recommendation of my favorite roofer. It works here for me. I also use it to kill moss on the driveway without harming the concrete or asphalt. I just sprinkle the dry powder on the growth and within a few days the growth turns brown and dies.
They can't get your Goat if you don't tell them where it is hidden.
bobbys
Sprinkling Tide detergent on Cedar shingles to kill moss and algae.
I really don't know why or how it works. I actually would be interested to learn why .
I should have cautioned that I have no experience with it on cedar roofs. I suppose it might be possible that it would wash the oils out of the cedar.
"bobbys" has also heard of this and uses it I think. Might shout out to him and see if he has experience with it on cedar. By dovetail
What do you know about this?
Does it harm the cedar?
Thanks
Rich
It has to be Tide (or other brands..) with bleach. It is the bleach crystals that do in the moss.
Apply it in calm weather when no rain is forecast for several days. You don't need a lot. The detergent doesn't penetrate, and the surface of your cedar will have very little of the natural oils left, so it doesn't harm your shingles. After several days, hose down the roof. Some of the dead moss may remain and can be brushed off by hand wearing work gloves.