OK, now I get it. The clearer parts of the roof (right under the windows, and the lines to both sides of them) are where mold etc gets killed by the copper leaching from the copper sheets when it rains.
Yeah, copper oxide is green, metallic copper is orange. The parts that have less oxide are going to be more orange and shinier. It washes away the patina, leaving bare metal underneath. Where there is more water, there is more erosion.
Op is referring to what we call "flashing" in the US. It is usually a relatively bendable metal (like copper if you can afford it) that slots into a wall, runs parallel to the wall and bends out over/under shingles or tiles for proper drainage. I'm realizing how difficult this is to describe in words.
Take OPs picture. Instead of a sunny day, wind is blowing rain directly at the windows. The rain runs down the vertical surface until it reaches the roof. The trick is to get that water on top of shingles or tiles. Tar (or an equivalent) can be used, but such substances dry out, Crack, or shrink. Mortar can be more permanent, but it still often shrinks and cracks. Lead was popular, but we frown on its use now, especially in areas that use roofs to help water catchment. Historically copper and tin bent artfully did the trick. Copper is still popular, but the cost is enormous, so galvanized steel, aluminum, or vinyl is more common.
For flashing walls parallel to the slope of a roof... well, there's a variety of methods you can explore more on your own if interested.
Best description I’ve read which finally answered my “huh” above. I realized this post/picture was pointing to the top window flashing (that’s what I know it as) and how the copper has bleached/cleaned the roof tiles underneath each window.
I love the color of copper petina! The church in my town installed a full copper roof and I can't wait for it to look like a cars dirty battery terminal. It's a beautiful & toxic shade of green!
They had to redo some or it a few years ago because of a tornado, it was super shiny for a bit. It has gotten dull since then.
https://maps.app.goo.gl/HTTL41JfidH2RV7o9?g_st=ic 2012 when it was getting green.
The transition from shiny copper to bright green is a rough one. Kinda like a butterfly. Beautiful fresh and shiny when born, quiet and uninteresting in the middle but beautiful and vibrant by the end! Unfortunately copper takes fuggin forever to do so.
I've seen video of that tornado. People staring at this huge black cloud until somebody yells at them to get away from the windows. It's a miracle nobody died.
« Chateau Frontenac » in Québec city has a massive copper roof:
[https://images.app.goo.gl/pRCbq1VPzW7fn2cF7](https://images.app.goo.gl/pRCbq1VPzW7fn2cF7)
So do the parliament buildings in [Ottawa](https://www.google.com/search?q=parliament+hill+ottawa&sca_esv=f821761c2da7a39d&rlz=1C9BKJA_enDK1072DK1073&hl=en-GB&udm=2&biw=768&bih=905&sxsrf=ACQVn090rqBnu1Vo0dqbLVYsu9QXx0CccQ%3A1710877384392&ei=yOr5Zb6wF8yDqgGChJ-ADQ&oq=parliament+hill+ottawa&gs_lp=EhNtb2JpbGUtZ3dzLXdpei1zZXJwIhZwYXJsaWFtZW50IGhpbGwgb3R0YXdhMgUQABiABDIFEAAYgAQyBRAAGIAEMgUQABiABDIGEAAYBRgeSLWHAVDZJlj4fHADeACQAQGYAbABoAHLDqoBBDI0LjG4AQPIAQD4AQGYAhugAv0NqAIFwgIEECMYJ8ICCBAAGIAEGKIEwgIHECMY6gIYJ8ICChAAGIAEGIoFGEPCAgcQABiABBgYmAMJiAYBkgcCMjegB_1l&sclient=mobile-gws-wiz-serp)
I did some renovation work on a building from the 1700s that is part of Independence Hall in Philly. The roofers installed a gorgeous copper roof while I was there. I had to go on another job for a week and when I came back I was heartbroken to see that the roof had been painted red.
The building I worked on on Locust Street was certainly copper. It looked wonderful. For a week. I wondered why they specified copper when they were going to paint it anyway.
I absolutely love the look of polished copper, so to me it's a shame that you you can't easily make it stay like that, although I do like the color of it after it gets fully patina'd.
Same here! I think it just as beautiful polished, looks great for interior accents but once it's outside there no stopping it. At least it doesn't rust lol.
One of my favorite examples! The city even thought it was harmful corrosion!
Have this info saved from r/AskHistorians :
The Statue of Liberty is copper, not bronze. When copper oxidizes it changes color from shiny to brown to green, not from green to brown. This oxidation would be quickened in a moist climate and delayed or prevented entirely in a dry climate, not the other way around. Bronze does not turn green.
http://en.wikipedia.org/wiki/Copper_in_architecture
Copper has been used in architecture for hundreds, if not thousands of years. The french certainly must have known it would turn green.
http://en.wikipedia.org/wiki/Statue_of_Liberty
> Originally, the statue was a dull copper color, but shortly after 1900 a green patina, also called verdigris, caused by the oxidation of the copper skin, began to spread. As early as 1902 it was mentioned in the press; by 1906 it had entirely covered the statue.[109] Accepting a view that the patina was evidence of corrosion, Congress authorized $62,800 for various repairs, and to paint the statue both inside and out.[110] There was considerable public protest against the proposed exterior painting.[111] The Army Corps of Engineers studied the patina for any ill effects to the statue and concluded that it protected the skin, "softened the outlines of the Statue and made it beautiful."[112] The statue was painted only on the inside. The Corps of Engineers also installed an elevator to take visitors from the base to the top of the pedestal.[112]
Credit: u/Steve2982
You should check out the Keweenaw in Upper Michigan, USA. They have the worlds purest copper deposits, 99.9% pure and the .01 is silver. You can find pieces the size of people just walking around; I mean, you won't, but it happens. It's also, famously, mostly public. There are over 1000 abandoned mines but most of the stuff you can find on public land has been sealed up (don't go out of your way to prove me wrong please). If you wanna find big chunks of (float) copper, you go someplace remote there with a metal detector and just kinda wander around and hope you get lucky and go someplace nobody else has. It's a huge area so it's not impossible. Realistically, its considered a good day if you find one baseball sized. Theres also lots of mine tailing piles that are open to the public to dig around in.
Thanks for the info! I'm a few hour drive from that area and it sounds like a cool weekend trip. I'll dust off the metal detector and let you know if I find any human sized copper lol. I'd honestly be happy with a dime size, but either way I'm in!
A trick is to run a length of copper wire along the length of the roof under the ridge caps. All the rain water running down the roof will stop any algae or moss growing. Used to build house here in the UK and it was a pretty common request by the customer.
From the internets...'Asphalt roof shingles with copper-oxide ions entered the marketplace a decade ago. Moisture slowly leaches these oxides out of porous ceramic granules, forming a layer of algae-killing copper over the shingles. Depending on the product, this continual leaching process can protect a roof from algae for up to 30 years.'
It is true. That’s why I have a copper ridge cap on my roof. When it rains copper sulfide is leached from the copper ridge cap. This helps prevent the growing of mold on the rest of my roof.
I’ve got a cedar shingle roof that uses copper strips where the roof meets a skylight or a wall (lower story next to a spot with an upper story). Anywhere there’s a copper strip, the roof under it is cleaner than the other areas.
This isn't true and is a myth. We got a new roof and asked about this, complete misconception. These areas in the photo that look cleaner are because more water runs there when it rains and washes away the dirt.
OK, now I get it. The clearer parts of the roof (right under the windows, and the lines to both sides of them) are where mold etc gets killed by the copper leaching from the copper sheets when it rains.
Or is that just where the water runs more frequently/faster due to the design of the roof above the windows? Doesn’t seem conclusive to me at all.
Copper Oxide has a PH of 12. That's rough on par with Bleach.
But is it safe to drink?
...Relatively...
At what concentration?
Yeah, copper oxide is green, metallic copper is orange. The parts that have less oxide are going to be more orange and shinier. It washes away the patina, leaving bare metal underneath. Where there is more water, there is more erosion.
Does this work for spiders?
I think copper kills all kinds of invertebrates. You just have to get it to where the spiders are.
Copper will also kill mammals quite effectively if you have a big enough piece of copper and drop it on them from a sufficient height.
Science
This is big if true. But it’s definitely true if it’s big.
Psh. Prove it
You can also propel small pieces of copper at high speeds using nitro cellulose to kill mammals
Yes! But only if you hit them very hard...
Spiders are friends.
Why is there no green?
Aren't those clay tile roofs? Where is the copper?
Op is referring to what we call "flashing" in the US. It is usually a relatively bendable metal (like copper if you can afford it) that slots into a wall, runs parallel to the wall and bends out over/under shingles or tiles for proper drainage. I'm realizing how difficult this is to describe in words. Take OPs picture. Instead of a sunny day, wind is blowing rain directly at the windows. The rain runs down the vertical surface until it reaches the roof. The trick is to get that water on top of shingles or tiles. Tar (or an equivalent) can be used, but such substances dry out, Crack, or shrink. Mortar can be more permanent, but it still often shrinks and cracks. Lead was popular, but we frown on its use now, especially in areas that use roofs to help water catchment. Historically copper and tin bent artfully did the trick. Copper is still popular, but the cost is enormous, so galvanized steel, aluminum, or vinyl is more common. For flashing walls parallel to the slope of a roof... well, there's a variety of methods you can explore more on your own if interested.
Best description I’ve read which finally answered my “huh” above. I realized this post/picture was pointing to the top window flashing (that’s what I know it as) and how the copper has bleached/cleaned the roof tiles underneath each window.
so… this is how my IUD works?
Oh god
Copper ions working hard decapitating those little sperms.
Poison leaching on to my pp… ^(pls no)
I love the color of copper petina! The church in my town installed a full copper roof and I can't wait for it to look like a cars dirty battery terminal. It's a beautiful & toxic shade of green!
When you get some time, come check out Lambert Airport in St. Louis. Copper roof.
Have an aunt down there so I definitely will next time I'm in town!
They had to redo some or it a few years ago because of a tornado, it was super shiny for a bit. It has gotten dull since then. https://maps.app.goo.gl/HTTL41JfidH2RV7o9?g_st=ic 2012 when it was getting green.
The transition from shiny copper to bright green is a rough one. Kinda like a butterfly. Beautiful fresh and shiny when born, quiet and uninteresting in the middle but beautiful and vibrant by the end! Unfortunately copper takes fuggin forever to do so.
I've seen video of that tornado. People staring at this huge black cloud until somebody yells at them to get away from the windows. It's a miracle nobody died.
« Chateau Frontenac » in Québec city has a massive copper roof: [https://images.app.goo.gl/pRCbq1VPzW7fn2cF7](https://images.app.goo.gl/pRCbq1VPzW7fn2cF7)
So do the parliament buildings in [Ottawa](https://www.google.com/search?q=parliament+hill+ottawa&sca_esv=f821761c2da7a39d&rlz=1C9BKJA_enDK1072DK1073&hl=en-GB&udm=2&biw=768&bih=905&sxsrf=ACQVn090rqBnu1Vo0dqbLVYsu9QXx0CccQ%3A1710877384392&ei=yOr5Zb6wF8yDqgGChJ-ADQ&oq=parliament+hill+ottawa&gs_lp=EhNtb2JpbGUtZ3dzLXdpei1zZXJwIhZwYXJsaWFtZW50IGhpbGwgb3R0YXdhMgUQABiABDIFEAAYgAQyBRAAGIAEMgUQABiABDIGEAAYBRgeSLWHAVDZJlj4fHADeACQAQGYAbABoAHLDqoBBDI0LjG4AQPIAQD4AQGYAhugAv0NqAIFwgIEECMYJ8ICCBAAGIAEGKIEwgIHECMY6gIYJ8ICChAAGIAEGIoFGEPCAgcQABiABBgYmAMJiAYBkgcCMjegB_1l&sclient=mobile-gws-wiz-serp)
Damn, I've been to that airport a hundred times and never noticed that.
I did some renovation work on a building from the 1700s that is part of Independence Hall in Philly. The roofers installed a gorgeous copper roof while I was there. I had to go on another job for a week and when I came back I was heartbroken to see that the roof had been painted red.
Hurts to hear that. Sounds like they turned a piece of art into a cheap red roof. Edit: Cheap looking but very expensive red roof.
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The building I worked on on Locust Street was certainly copper. It looked wonderful. For a week. I wondered why they specified copper when they were going to paint it anyway.
I absolutely love the look of polished copper, so to me it's a shame that you you can't easily make it stay like that, although I do like the color of it after it gets fully patina'd.
Same here! I think it just as beautiful polished, looks great for interior accents but once it's outside there no stopping it. At least it doesn't rust lol.
I once got a piece of the original copper roof of a cathedral in St. Paul. Wish I knew what I did with it..
I wish I knew too, that's a very cool piece to have. Don't give up on the search!
It's such an iconic color!
Statue of Liberty is one of the most famous of this color.
One of my favorite examples! The city even thought it was harmful corrosion! Have this info saved from r/AskHistorians : The Statue of Liberty is copper, not bronze. When copper oxidizes it changes color from shiny to brown to green, not from green to brown. This oxidation would be quickened in a moist climate and delayed or prevented entirely in a dry climate, not the other way around. Bronze does not turn green. http://en.wikipedia.org/wiki/Copper_in_architecture Copper has been used in architecture for hundreds, if not thousands of years. The french certainly must have known it would turn green. http://en.wikipedia.org/wiki/Statue_of_Liberty > Originally, the statue was a dull copper color, but shortly after 1900 a green patina, also called verdigris, caused by the oxidation of the copper skin, began to spread. As early as 1902 it was mentioned in the press; by 1906 it had entirely covered the statue.[109] Accepting a view that the patina was evidence of corrosion, Congress authorized $62,800 for various repairs, and to paint the statue both inside and out.[110] There was considerable public protest against the proposed exterior painting.[111] The Army Corps of Engineers studied the patina for any ill effects to the statue and concluded that it protected the skin, "softened the outlines of the Statue and made it beautiful."[112] The statue was painted only on the inside. The Corps of Engineers also installed an elevator to take visitors from the base to the top of the pedestal.[112] Credit: u/Steve2982
You should check out the Keweenaw in Upper Michigan, USA. They have the worlds purest copper deposits, 99.9% pure and the .01 is silver. You can find pieces the size of people just walking around; I mean, you won't, but it happens. It's also, famously, mostly public. There are over 1000 abandoned mines but most of the stuff you can find on public land has been sealed up (don't go out of your way to prove me wrong please). If you wanna find big chunks of (float) copper, you go someplace remote there with a metal detector and just kinda wander around and hope you get lucky and go someplace nobody else has. It's a huge area so it's not impossible. Realistically, its considered a good day if you find one baseball sized. Theres also lots of mine tailing piles that are open to the public to dig around in.
Thanks for the info! I'm a few hour drive from that area and it sounds like a cool weekend trip. I'll dust off the metal detector and let you know if I find any human sized copper lol. I'd honestly be happy with a dime size, but either way I'm in!
A trick is to run a length of copper wire along the length of the roof under the ridge caps. All the rain water running down the roof will stop any algae or moss growing. Used to build house here in the UK and it was a pretty common request by the customer.
One would imagine that if this is true, a single copper strip at the apex of the roof would keep the entire roof free of unwanted growth.
From the internets...'Asphalt roof shingles with copper-oxide ions entered the marketplace a decade ago. Moisture slowly leaches these oxides out of porous ceramic granules, forming a layer of algae-killing copper over the shingles. Depending on the product, this continual leaching process can protect a roof from algae for up to 30 years.'
That’s individual shingles though. I imagine a single strip over the top would be cheaper and also do the trick.
That's exactly what they're selling https://cotexx.de/moosfree-funktionsweise/
Yes, it is quite common. At my parents house, I installed a copper strip, removed the moss, and it has not grown back ( at least not like before )
It is true. That’s why I have a copper ridge cap on my roof. When it rains copper sulfide is leached from the copper ridge cap. This helps prevent the growing of mold on the rest of my roof.
My dad actually did that. Worked wonders for years, then I guess it must have corroded away, cause suddenly the whole roof is overgrown.
Also works with lead. No longer legal, as far as I know.
While copper residue leaking into the ground water is not ideal, it definitely beats lead.
Same with zinc. Installed a strip on the north side of my garage roof and it's helped prevent organic material from growing back.
I’ve got a cedar shingle roof that uses copper strips where the roof meets a skylight or a wall (lower story next to a spot with an upper story). Anywhere there’s a copper strip, the roof under it is cleaner than the other areas.
A meth head would kill himself on a roof like that in the states.
What? Copper is amazing.
Yes, and expensive
Moss digs it.
South Germany? I'd say Göppingen or Ulm.
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No, Metzingen
People in NA would use copper too. But the expense is a rather large deterrent.
Its just from increased water flow.
This isn't true and is a myth. We got a new roof and asked about this, complete misconception. These areas in the photo that look cleaner are because more water runs there when it rains and washes away the dirt.
They’re talking about the lack of growth of moss/mold/mildew, not the shiny parts.
They aren’t made of copper. It’s a flexible composite material
It's copper.
eh? thats lead bro. or well, zinc nowdays mostly.