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Joe Jenkins
Posted on Monday, July 24, 2006 - 12:04 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only) Ban Poster IP (Moderator/Admin only)

Copper should not come in contact with aluminum. It's possible that you can install a vapor barrier between the copper and aluminum, such as 30 lb felt, in order to avoid a galvanic reaction.
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scott
Posted on Thursday, July 20, 2006 - 11:06 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only) Ban Poster IP (Moderator/Admin only)

My late 1920's era house has a slate roof (16;12 pitch) and on the second floor facing the street are two dormers with curved roofs which had copper roofs. Someone covered over the copper with a glued rubber. I am guessing they may have been leaking befor the rubber covering was installed. The dormers about three feet wide and aprxmt 4 feet tall.
I want to replace the old steel casement windows and the wood facia board that surrounds the window. The new window exterior would be aluminum and would be painted from the factory. Part of the plan is to restore the copper roof and sides of the dormer. I can see the old copper roof edge was cut and bent on the elipse and edge of the wood facia board.

Two questions:

If the facia board is replaced with painted aluminum and the new copper roof touches the painted aluminum will this cause galvanic action on the aluminum?

What should I be aware of when it comes time to replace the curved dormer roofs with new copper? I realize of course the slate must be removed to flash around the dormer. I need to know enough so that I can make sure it will be done properly. I have read the Slate Roof Bible. SRB didn't weem to address copper covered dormers?

P.S I really enjoy this site. I have educated my self a great deal from reading all the posts.

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