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Galvanized roofing iron and copper spouting - A Good Mix?

2003

I have a concrete tile roof which needs replacing. The guttering which collects water off the roof and down pipes are all copper. I am thinking I will replace the roof with long-run galvanized roofing iron, but will this cause a problem with the copper spouting and down-pipes. The galvanized roofing will be isolated from the copper but obviously will be connected (by the water) when it rains. I would like advice on whether it is wise to mix galvanized roofing iron with copper spouting and down-pipes.

Cheers,

Archie MacLean
- Wellington, New Zealand

Hi Archie. If the two metals are not physically touching (a metal to metal conductive circuit), you cannot have galvanic corrosion. Think of a drycell battery still in its package. No current flows until you connect the two different metals (the positive and negative poles) with a piece of wire.

Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
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2003

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