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-   -   Rust from chimney (http://www.diychatroom.com/f2/rust-chimney-182434/)

scottb88 06-24-2013 07:11 PM

Rust from chimney
 
Had rust stain on shingles coming down from chimney to gutter for years. Finally had replaced with faux brick veneer and new flashing. But rust has returned. Anyone know what's causing this? I've heard that there are some acids that work well on rust but I need to fix this. Please help, thanks.

PoleCat 06-24-2013 07:44 PM

Probably have some old galvanized flashing under the shingles that's past its life.

joecaption 06-24-2013 08:07 PM

Who flashed it? Unless this was repair 20+ years ago someone left some of the old flashing in place. It needs to go or the rust going to just come back.

scottb88 06-24-2013 08:23 PM

A "professional" chimney guy flashed it last year, and allegedly removed the old. So you're saying its possible to leave some of the old and just go over the top of it?

TarheelTerp 06-24-2013 09:39 PM

Quote:

Originally Posted by scottb88 (Post 1206666)
A "professional" chimney guy flashed it last year, and allegedly removed the old. So you're saying its possible to leave some of the old and just go over the top of it?

rust = ferrous steel
Chimney flashing is either aluminum or copper

PoleCat 06-25-2013 06:08 AM

Quote:

Originally Posted by scottb88 (Post 1206666)
A "professional" chimney guy flashed it last year, and allegedly removed the old. So you're saying its possible to leave some of the old and just go over the top of it?

That was certainly the case on my roof. Everything put up there since it was first built was still there. Had two complete sets of galvanized flashing in there.


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