Advice for moss and algae on asphalt roof shingles

snipped-for-privacy@mucks.net wrote in news: snipped-for-privacy@4ax.com:

Nice suff...Wonder if Rover will be rigid yet when Mr Fixit comes off the roof.

[from the link]

Benzalkonium chloride, also known as alkyldimethylbenzylammonium chloride and ADBAC, .... ADBAC is highly toxic to fish (LC50 = 280 ?g ai/L), very highly toxic to aquatic invertebrates (LC50 = 5.9 ?g ai/L), moderately toxic to birds (LD50 = 136 mg/kg-bw), and slightly toxic to mammals (LD50 = 430 mg/kg- bw).[4] Benzalkonium chloride solutions of 10% or more are toxic to humans, causing irritation to the skin and mucosa, and death if taken internally.[5]

Reply to
Red Green
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Wow! Thanks everyone for quite of bit of education. I am going to try the product mentioned first and next spring try the zinc plates for an ongoing effect.

Thanks again all - this was great!

Bob

Reply to
Bob M

If by "weedkiller" he meant Roundup, then it was quite eco-friendly. The stuff is approved for use on food crops.

Reply to
salty

10% ? The concentration of Benzalkonium chloride in the use of this product is not even close to 10%

Internally? Do you take gasoline, bleach, or bullets internally? If so then I would also be concerned with Benzalkonium chloride.

Reply to
tnom

You're right!

Reply to
Jeff The Drunk, BITCH

I don't know where you got that idea, given that I've never posted my position on that topic.

So many companies greenwash their product that the "green" or "Environmentally friendly" tags have become meaningless advertising fodder.

That said, I am substantially more concerned about environmental issues than many of my peers and acquaintances.

There are things that were commonplace in the old days (say, 35 years ago) that I would not consider doing today. A few examples: dumping used motor oil into soil as fence line weed killer. Gasoline as parts wash, then dumped on the fence line as weed killer. Venting freon to the atmosphere, both to repeatedly refill leaking systems and for actual repair.

As far as necessary use of chemicals (and other goods), I want products that work. If there are choices that are truly better for the biosphere, and the purchase cost different is not too great, I will go with the "bio friendly" option.

Reply to
Tony Sivori

Thanks for that. One more question (that I should have asked the first time), what is the percentage listed on the label?

Reply to
Tony Sivori

I used the product "Shingle Shield" which are zinc strips installed near the roof peak, that was nearly 20 years ago. Today there are shingles made that release metal ions. For existing conditions you might try a moss/algae killer product (hardware store, HD, Lowes). Increase the sunlight and airflow to your roof (remove a tree or two?). Increase your roof's pH. Decrease moisture--Check drains/gutters. Your trees are probably giving you a lot more shade than 5 years ago.

Reply to
Phisherman

Careful, a reasonable opinion like that could get you kicked out of here.

-- aem sends....

Reply to
aemeijers

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