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TOPIC: I Have An Existing Metal Roof and Have A Question

Rust on edge of standing seam metal roof.

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I have several panels with rust on the bottom edge, one very badly rusted. What went wrong?picture1.pdf

Robert Wyckhuyse

4/26/2020
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What sort of environment is this installation in?

Todd Miller
Todd Miller
Isaiah Industries, Inc.

4/26/2020
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I live in Oregon, west side of the Cascades. Winter is mostly wet and rainy.

Robert Wyckhuyse

4/26/2020
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I live in Oregon, on the west side of the Cascades. Winter is mostly wet and rainy.

Robert Wyckhuyse

4/26/2020
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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.

Todd Miller
Todd Miller
Isaiah Industries, Inc.

4/26/2020
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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?

Robert Wyckhuyse

4/26/2020
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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.

Todd Miller
Todd Miller
Isaiah Industries, Inc.

4/26/2020
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How old is that roof?

Eric Novotny
Eric Novotny
An informed customer is the Best Customer!

4/26/2020
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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?

Robert Wyckhuyse

4/26/2020
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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.

Todd Miller
Todd Miller
Isaiah Industries, Inc.

4/26/2020
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