Hi- For the past week or so, and as I speak, we have been reroofing our
25-year old Colonial. Much of the house is brick, however, some parts do have cedar siding. In these areas there is a lot of roof-meeting-the-siding going on, and they had been originally flashed with galvanized steel. However, it is impossible to remove the flashing without severely damaging the cedar siding. We had choosen to use copper flashing on all parts of the house, and the roofer thought he probably could just put new copper flashing, for the new fiberglass roof, over the existing galvanized steel flashing, which was for the existing shake roof and is incompatable with the new roof.So my question is, is it safe to flash a different metal on top of an existing one? We are worried about creating current or some unforseen problem with what should be a fairly mundane thing.
I'd appreciate a really quick reply from anyone who has an experience at all in this, as the roofing is being done as I write this.
Thank you.