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Rusted Flashing


Mike Lamb
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What is causing the staining on the shingles above the flashing?

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Thanks for the comments.

There was a downspout above the metal flashing but the staining is mostly from black algae. There were no stains at all on the south side of the roof. 15 year old roof.

This is also an example where I think the dormer valleys should have been cut first even though the dormer has a steeper pitch. This was discussed in another thread recently.

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This is also an example where I think the dormer valleys should have been cut first even though the dormer has a steeper pitch. This was discussed in another thread recently.

Given that those shingles look as good as they do, I'd say that really wouldn't make too much difference. The 15 year old 3 tabs on my house are way worse than those.

Tom

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On occasion, Mike secretes oxalic acid.

It's why his T shirts are stained brown.

Nah, that's not from oxalic acid; that's from when I find myself in a crawlspace and the IBS kicks in and there's no toilet paper handy.

ONE TEAM - ONE FIGHT!!!

Mike

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On occasion, Mike secretes oxalic acid.

It's why his T shirts are stained brown.

Nah, that's not from oxalic acid; that's from when I find myself in a crawlspace and the IBS kicks in and there's no toilet paper handy.

ONE TEAM - ONE FIGHT!!!

Mike

That . . . is gross. Pure and simple.

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