can copper and steel touch without reacting over time?

Question

Have been asked to put copper flashings on a steel roof - but suspect this could cause a reation, can you help ?

Answer 1

Only if there is no moisture present. the copper MUST be insulated from the steel if you want it to last.

Answer 2

Why don't you use galvanized steel flashing or vinyl. If the steel roof had a paint coating, the copper though would not be on physical contact, so voltaic reaction would take place for some time. The copper would keep any moss at bay if you had that problem.

Answer 3

The copper will last many lifetimes. The steel will eventually rust because the coatings aren't near as good as they claim. Paint the steel often with enamel paint. The reaction you are asking about won't matter at all. With a huge roof, any electrolysis will be totally grounded out. The bird droppings will get you first.

Answer 4

I wouldn't do it, but if you must...ensure that the steel is coated so that the metals are not in direct contact. Also, use copper nails on the copper flashing. They're more expensive but very necessary.

Answer 5

Yes; the best way to figure this out is to look at where they are on the periodic table of elements. They'll build up a charge, and the copper will corrode quickly.

Answer 6

any time two dissimilar metal touch, there will be corrosion. You can prevent this by putting a small bead of silicone between them.

Answer 7

yes

Answer 8

no, its called effusion, eventually, very slowly, they will react.

Answer 9

No