TOPIC: I Have An Existing Metal Roof and Have A Question
Return to I Have An Existing Metal Roof and Have A Question
Return to Forum
I have several panels with rust on the bottom edge, one very badly rusted. What went wrong?picture1.pdf
What sort of environment is this installation in?
I live in Oregon, west side of the Cascades. Winter is mostly wet and rainy.
I live in Oregon, on the west side of the Cascades. Winter is mostly wet and rainy.
I was wondering whether you were in a salt or brackish water environment. It sounds like you probably are not. There are a lot of things that could have contributed and one is inferior raw material -- metal or coating issues. I am also unsure whether the panel was cut at that end or folded around but a fold may have been too tight or a cost could have been poorly done such as with a saw. There also could have been leak problems higher on the roof.
We’re located 100 miles + from the coast. The ends were cut at the manufacture and not folded. The roof 7 1/2 years old. Is this a common type failure?
I would say this is not a common occurrence. It probably will require, at least, a site inspection from the manufacturer to determine what has happened.
How old is that roof?
I read some about cut edge corrosion, where possibly edge was not coated after cut, or shear was dull. Most of that information from the UK. Is that something seen here stateside?
Edges are almost never coated after cutting. In most cases, factory edges as you have said this is have very clean cuts which do not promote cut edge corrosion. In a site inspection, I would look for any sort of corrosive run-off that has been on the roof, or any reason moisture has been trapped against the edge of the roof. Barring those things, I would want to get samples of the metal to understand the quality of the metal and whether something went wrong perhaps with the paint pre-treatment. Of course, other things could be discovered along the way as well. Have you contacted the manufacturer? Unfortunately, there is just no way for me to diagnose this further without inspection.
If you would like to reply to this thread, please
If you do not have an Ask the Experts forum user account,