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GARY(OH/IN) 
Orange Level
Joined: 19 May 2010
Location: Findlay,Ohio
Points: 917
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 Topic: Algae on the roof
Posted: 19 Jun 2022 at 8:27pm |
Have light colored spots over about 300-400 square feet in the shade. What will take it off? Maybe white vinegar, chlorine mix, or ?
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DiyDave
Orange Level Access
Joined: 11 Sep 2009
Location: Gambrills, MD
Points: 55276
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Posted: 19 Jun 2022 at 9:03pm |
Copper ridge cap or strip will keep it from happening, again... 
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Source: Babylon Bee. Sponsored by BRAWNDO, its got what you need!
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Dave H
Orange Level
Joined: 11 Sep 2009
Location: Central IL
Points: 3607
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Posted: 20 Jun 2022 at 9:22am |
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Wet and forget. Worked for me.
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Lars(wi)
Orange Level Access
Joined: 14 Sep 2009
Location: Permian Basin
Points: 8402
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Posted: 20 Jun 2022 at 1:50pm |
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Cut the tree down.
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I tried to follow the science, but it was not there. I then followed the money, and that’s where I found the science.
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dee_veloper
Orange Level
Joined: 12 Apr 2021
Location: USA
Points: 1168
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Posted: 20 Jun 2022 at 6:55pm |
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I use Moss B Ware powder for roofs and sidewalks to keep algae and moss off my roof. I have an asphalt roof and in the fall I sprinkle the powder along the ridge line and let the rains wash it down into all the little crevices. Keeps the roof looking fresh and clean. Been using it for years no problems.
Edited by dee_veloper - 20 Jun 2022 at 9:23pm
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Don't confuse my personality with my attitude.
My personality is who I am. My attitude depends on who you are.
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Coke-in-MN
Orange Level Access
Joined: 12 Sep 2009
Location: Afton MN
Points: 42266
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Posted: 22 Jun 2022 at 1:49am |
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Zinc will also inhibit the growth or staining , look at areas around flashings on shigles and notice those areas are clean .
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Life lesson: If you’re being chased by a lion, you’re on a horse, to the left of you is a giraffe and on the right is a unicorn, what do you do? You stop drinking and get off the carousel.
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jaybmiller
Orange Level Access
Joined: 12 Sep 2009
Location: Greensville,Ont
Points: 25247
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Posted: 22 Jun 2022 at 6:58am |
Moss B ware is 99,44% zinc..something. It's listed in the SDS !
The 'sneaky' way to SEE what's actually in products being sold, check the SDS forms.
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3 D-14s,A-C forklift, B-112
Kubota BX23S lil' TOOT( The Other Orange Tractor)
Never burn your bridges, unless you can walk on water
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FREEDGUY
Orange Level Access
Joined: 15 Apr 2017
Location: South West Mich
Points: 5396
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Posted: 26 Jun 2022 at 6:06pm |
 Lars(wi) wrote:
Cut the tree down. |
Are you serious "CLARK" 
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GARY(OH/IN)
Orange Level
Joined: 19 May 2010
Location: Findlay,Ohio
Points: 917
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Posted: 28 Jun 2022 at 12:52am |
Had my grandson mix 1/3 gallon 12.5% chlorine with 1 gallon water and sprayed on with a hand pump sprayer. So far so good. And yes I was up there working on some flashing and he's 20 so no labor laws broken,
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