Replies

1. 
   maddog3 | Jul 10, 2005 05:18am | #1

   there is galvanic corrosion between copper plumbing and galvanized electrical conduit if they touch each other .... FWIW

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1. 
   bhackford | Jul 10, 2005 05:30am | #2

   That is what I thought, so you need copper nails right?

1. 
   maddog3 | Jul 10, 2005 05:36am | #3

   stainless would probably be better than copper, maybe a carpenter will come along soon, as I am an electrician"

1. 
   ncarey | Jul 10, 2005 06:12am | #9

   Your best choice would be copper slating nails.

   View Image

   You can get them from (if you can't find them elsewhere) Jamestown Distributors.

   The problem with stainless is that it's subject to "crevice corrosion": stainless depends on available oxygen to maintain a thin layer of oxide that protects it from corrosion. Deprived of oxygen, the stainless can't maintain the oxide layer and it corrodes away.

   Buried under tar/roofing materiel, your stainless is likely to corrode well before the copper.

   In a marine environment, crevice corrosion can destroy below-waterline fasteners right quick. Here's a picture of a 5-year old stainless rudder fastener off an Alberg 30 (click here for more info):

   View Image

   If you can find them, either monel (nickle alloy) or silicone bronze (90/9/1 copper/tin/silicone) fasteners will outperform copper. Monel more expensive than silicone bronze more expensive than copper.

   Edited 7/9/2005 11:35 pm ET by Nicholas Carey

1. 
   maddog3 | Jul 10, 2005 01:57pm | #11

   would zinc have prevented the corrosion of the bolt ?"

2. 
   VaTom | Jul 10, 2005 04:02pm | #12

   Excellent first post.  Would appear you've been around awhile.  Welcome to BT.  Also an informative web site.  Thanks.PAHS Designer/Builder- Bury it!

2. 
   Sphere | Jul 10, 2005 05:37am | #4

   You can, but be prepared to watch them get eaten

   Cu is wantin Cu..SS is acceptable as a sub.

   I do it daily..trust me.

     Spheramid Enterprises Architectural Woodworks

   What are dreadlocks made from?

1. 
   maddog3 | Jul 10, 2005 05:41am | #5

   so Cu nails get eaten by the flashing?"

1. 
   Sphere | Jul 10, 2005 05:50am | #6

   no..galv will die first. zinc and Cu= battery..he needs Cu nails.  Spheramid Enterprises Architectural Woodworks

   What are dreadlocks made from?

1. 
   bhackford | Jul 10, 2005 05:57am | #7

   But SS nails will work and go the distance right? Do big box store carry CU nails?

1. 
   maddog3 | Jul 10, 2005 06:07am | #8

   check herehttp://www.manasquanfasteners.com/Manasquan%20Premium%20Fasteners%20General%20Information.htm"

2. 
   ian | Jul 10, 2005 04:38pm | #13

   You want to use copper nails.

   The risk with SS is that the copper arround the nail will corrode.

    

3. 
   seeyou | Jul 10, 2005 05:51pm | #14

   Do big box store carry CU nails?

    

   Probably not. But they also don't carry the copper he's using for flashing. You get the nails where you get the copper. Most roofing supply houses carry every thing you need to do a roof.Probably the earliest fly swatters were nothing more than somesort of striking surface attached to the end of a long stick.

3. 
   cliffy | Jul 10, 2005 06:33am | #10

   Any two disimilar metals plus moisture will give you galvanic corrossion.   The safest bet is to use copper nails.  You can get some when you buy copper straps, they are usually included but you may skip Home Depot  (plumbing? I think that is isle 9)and go right to your local plumbing specialty shop.

   Have a good day

   Cliffy

4. 
   JohnSprung | Jul 11, 2005 08:38pm | #15

   http://www.swansecure.com for copper nails.  If thermal expansion/contraction of the sheet copper will be an issue, look into nailing thru cleats rather than the sheet itself.

    

   -- J.S.