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Steel and aluminum roof combo

I'm putting a steel roof on a new addition to my house. The older roof that I'm going to run up on, is an aluminum aluma-lock shingle. Will I have a problem in the future with corrosion? and if so, what can I do to avoid this problem? Anything you can tell me would be greatly appreciated.

Scott Morrow
homeowner - Evanston, Wyoming, USA
2004

If you can keep the steel from actually touching the aluminum there will be no problem. Galvanic corrosion requires a metal to metal connection.

Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
2004

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