[TheForge] Update [OT - Asphalt shingle rot? (Lichen)]

[Larry Brown]

I would just string some bare copper electric wire across the roof. Anchor 
wire in a few spots with a nail and some tar
Larry



At 02:26 PM 7/7/2010 -0400, you wrote:
>Well, this is amusing so I thought you might like an update.
>
>Before dropping $60+ on copper flashing, I did some more Web-research.
>  Turns out that those of you who spoke up are apparently right --
>copper OR zinc cations will kill lichens.
>
>So, what's the cheapest source of copper AND zinc metals?  You guessed
>it -- "copper" pennies.  So now, if you look real close, you'll see
>pennies scattered on the north-facing side of my roof, mostly near the
>peak.  I had only about $5 worth of pennies around when I did this, so
>might go buy another $10 worth for the effort.  I figure with rain and
>winds, these will tend to wash down the roof, but I'll cross that
>bridge when I come to it.
>
>Meanwhile, I haven't given up on the notion of spraying the roof with
>copper sulfate, but I've been trying to figure how and how much.
>Seems to me that if a strip of copper foil across the roof will
>protect the roof for 30 years or more (so claims that manufacturer),
>then the concentration of copper needed could NOT be very high.  I
>haven't actually worked out a number, but it must be vanishingly
>small.
>
>So I envision doing something like putting a half-teaspoon (if that
>much) copper sulfate, dissolved in water, in a sprayer and spraying
>the roof with it.  The problem with this is that I do NOT want to
>inhale the stuff.  So I could use goggles and mask and wait till the
>wind is right, or I could come up with an alternative way.  I could
>possibly roll it on like paint, and if I did that I wouldn't even need
>to cover the whole roof, as it will wash down from the peak to the
>rest of the roof.
>
>Still thinking on it.
>
>--
>Bruce
>NJ
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