Tom Hanrahan

04:18AM | 12/31/02
Member Since: 12/28/02
24 lifetime posts
On the shaded, north side of our six-year-old asphalt shingle roof, there are flat patches of what appears to be lichens growing. In the past, i had used a product form Gardens Alive!, an organic gardening supply company, to eliminate this problem. Now, the company no longer carries the product (I have forgatten the name) and I get blank looks whenever I inquire about such a product and a lawn and garden store or at a lumber yard.

I have tried Roundup, but that didn't work.

Any ideas?


04:29AM | 01/02/03
Member Since: 03/13/00
1675 lifetime posts
I just did a search on "gardens alive" and immediately found the Gardens Alive store.
I believe it's what you want. Try it.

Tom Hanrahan

03:19AM | 01/04/03
Member Since: 12/28/02
24 lifetime posts
What about a bleach solution? Would that work on these gowths that resemble the lichen/algae that grows on tree bark and rocks?


06:01PM | 01/05/03
Member Since: 11/06/02
1280 lifetime posts
Bleach and some of these products can be hard on vegetation and shingles.
A strip of zinc at the ridge will let minute amts of zinc to wash down over the roof and discourage growth of moss and lichens.

Tom Hanrahan

12:27AM | 01/06/03
Member Since: 12/28/02
24 lifetime posts
That sounds intersting. Where would I find such a strip of zinc?


09:41PM | 01/06/03
Member Since: 01/03/03
97 lifetime posts
piffins has got it right absolutely the zinc strip is miracle worker for growth, just install it under the ridge shingles at the top of your roof (be sure to let some of it stick out of course) and you are good to go, you should be able to find these products at like a home depot ***** or even a roofing wholesale supply shop. be careful with using chemicals on your roof it can severly discolor and ruin the shingles and it may even void your warranty
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