Leland,
Revere copper is coated with Follansbee's Terne Coat II (zinc and tin)
Thanks,
Eric Hammarberg
Vice President
Thornton Tomasetti
51 Madison Avenue
New York, NY 10010
T 917.661.7800 F 917.661.7801
D 917.661.8160
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This message sent from Treo, please pardon spelling and other mistakes.
-----Original Message-----
From: Leland Torrence [mailto:[log in to unmask]]
Sent: Wednesday, July 11, 2007 09:56 AM Eastern Standard Time
To: [log in to unmask]
Subject: Re: [BP] Terne coated COPPER Roofing
Eric,
That's why I like the chart. I have some charts with a bazillion metals and
alloys, but can't make heads or tails of it. I do like the zinc, but I have
no jobs more than three years install, except for one from 1991 which was a
lesson in what not to do with zinc. It has a beautiful soft look to it. We
used to use it for stucco detailing and mesh, but I haven't been able to get
it for about a year. The price of stainless does not seem to have ceiling
and the quality is worse every year. What is the coating on the Revere
grey?
Best,
Leland
Leland R. S. Torrence
Leland Torrence Enterprises and the Guild
17 Vernon Court, Woodbridge, CT 06525
Office: 203-397-8505
Fax: 203-389-7516
Pager: 860-340-2174
Mobile: 203-981-4004
E-mail: [log in to unmask]
www.LelandTorrenceEnterprises.com
-----Original Message-----
From: This conversation may be monitored for quality control.
[mailto:[log in to unmask]] On Behalf Of Hammarberg,
Eric
Sent: Wednesday, July 11, 2007 8:54 AM
To: [log in to unmask]
Subject: Re: [BP] Terne coated COPPER Roofing
Leland
Thanks, we have a galvanic chart but this one is nice and simple.
The material we are considering is not zinc but coated copper. I have not
given much thought to using zinc for roofing as copper and stainless have
such a good local track record. Do you like zinc?
Thanks,
Eric Hammarberg
Vice President
Thornton Tomasetti
51 Madison Avenue
New York, NY 10010
T 917.661.7800 F 917.661.7801
D 917.661.8160
[log in to unmask]
This message sent from Treo, please pardon spelling and other mistakes.
-----Original Message-----
From: Leland Torrence [mailto:[log in to unmask]]
Sent: Tuesday, July 10, 2007 06:01 AM Eastern Standard Time
To: [log in to unmask]
Subject: Re: [BP] Terne coated COPPER Roofing
Eric,
Attached below is a good simple chart for galvanic reactions. As for Zinc,
maybe you already know, but the detailing is very different from copper.
You can't have any old tin knocker do Zinc. You also have to watch for
design details and what would promote ripping, cracking/splitting or white
rust. I prefer Rheinzink. They also have a pretty good book "Applications
in Architecture".
Best,
Leland
Design Handbook: Section 1
Fundamentals: Architectural Considerations
----------------------------------------------------------------------------
----
Weathering, Corrosion, Staining, Substrate, Solder, Sealants
One of the most important issues concerning the use of copper is the
chemical reaction between copper and other materials. Chemical reactions are
responsible for corrosion, staining, and even the green patina that develops
on copper surfaces over time.
Weathering and Patination:
The oxidation process that gives copper its characteristic green patina is a
result of exposure to an acidic atmosphere. The process is, therefore,
faster in some metropolitan, marine, and industrial areas, where higher
concentrations of pollutants exist. When acidic moisture comes in contact
with exposed copper surfaces, it reacts with the copper to form copper
sulfate. The acid is neutralized during the reaction with the copper. This
patina eventually covers the surface and adheres tightly to it, thus
providing a protective layer against further weathering.
Corrosion:
All metals have a property called nobility. It is a measure of a metal's
resistance to corrosion when in contact with another metal. A greater
relative difference in nobility between the two metals in contact indicates
a greater corrosion potential. Table 1.1.4 ranks the most common metals used
in construction in increasing nobility, called the galvanic number.
Table 1.1.4 - The Nobility of Common Metals
1. Aluminum
2. Zinc
3. Steel
4. Iron
5. Stainless Steel - Active
6. Tin
7. Lead
8. Copper
9. Stainless Steel - Passive
When dissimilar metals are in contact with one another in the presence of an
electrolyte, galvanic action occurs, resulting in the deterioration of the
metal with the lower galvanic number. The electrolyte may be rain water
running from one surface to another, or moisture from the air containing
enough acid to cause it to act as an electrolyte.
Leland R. S. Torrence
Leland Torrence Enterprises and the Guild
17 Vernon Court, Woodbridge, CT 06525
Office: 203-397-8505
Fax: 203-389-7516
Pager: 860-340-2174
Mobile: 203-981-4004
E-mail: [log in to unmask]
www.LelandTorrenceEnterprises.com
_____
From: This conversation may be monitored for quality control.
[mailto:[log in to unmask]] On Behalf Of Jim Hicks
Sent: Monday, July 09, 2007 5:54 PM
To: [log in to unmask]
Subject: Re: [BP] Terne coated COPPER Roofing
On 7/9/07 9:12 AM, "Hammarberg, Eric" <[log in to unmask]>
wrote:
Yes folks it appears that this is Freedom Gray by Revere - Tin/Zinc Coated.
Is there any reason to be concerned about galvanic action?
Eric Hammarberg, Assoc. AIA
Vice President
Thornton Tomasetti
51 Madison Avenue
New York, NY 10010
T 917.661.7800 F 917.661.7801
D 917.661.8160
[log in to unmask]
_____________________________________________
From: Hammarberg, Eric
Sent: Friday, July 06, 2007 2:06 PM
To: 'The Listserv that makes holes in Manhattan schist for free!'
Subject: Terne coated COPPER Roofing
Does anybody have an opinion of Terne coated COPPER Roofing?
Thanks,
Eric Hammarberg, Assoc. AIA
Vice President
Thornton Tomasetti
51 Madison Avenue
New York, NY 10010
T 917.661.7800 F 917.661.7801
D 917.661.8160
[log in to unmask]
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I think for galvanic action you need surfaces next to each other to have an
oxidation process occur with each surface that effecting the other. When two
metals are fused like tin/zinc on copper there isn't a surface to be
interacted on.
j
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