Chimney 'Bleeding'

Hopefully someone can help me out on this condition? Any thoughts are appreciated. Brick red bleeding pattern on roof .

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Google red chimney stains, and you will find a plethora of opinions.

I think that the chimney has bigger problems.

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I know this sounds weird, but it resembles a ‘stain’ was applied to the masonry, likely to try and hide it’s many defects.
Many cracks, from the crown on down to the crap flashings. Almost looks like it’s gonna split in half!
IMO, that chimney needs rebuilt or removed/eliminated if no longer needed for an active fireplace.

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Chimney looks terrible. I was going to guess it had a rusty steel rain cap at some point.

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Issues for sure. I’ve never seen ‘staining’ like that, only from rusting flashing and caps. Thanks for your time guys!

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I have never seen anything this big, in all directions from the chimney.

The comments of the chimney condition is what causes this type staining, but not this big.

I suspect that this is the result of a former condition, like a rain cap (there is a line on the tile indicating this). Splash from the cap after it totally rusted and deteriorated from age etc.

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Good observation with the tile flue line. Much appreciated!

what David said,

Wood-burning appliance using, or previously using the chimney? If so, the likely cause is creosote.

The stain is due to flue gases condensing on the metal rain cap and dripping down on the chimney and roof. You can’t clean it off the roof. An inverted cone under the cap helps redirect the condensation back into the chimney.

2023-12-06 14_01_45-Weather Cap,Steel,18 ga Thick,Round - Grainger

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What appliance is using the chimney or is this a wood burning or solid fuel fireplace?
If for an appliance, what energy or energies are being used? Electric and oil fired furnace or boiler?

1: I suspect the chimney has a drafting issue, big time. The flue gases are not hot enough.
2: Possibility, rust stains form a corroded heat exchanger.

By the looks of it there was an ember guard and rain cap at one time exasperating the issue and it was removed to see if the flue gas would travel upwards.

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I should have thought of this before.
Inspectapedia: Guide to Red or Brown Rust Stains on Building Roofs & Chimneys

Randy,

I think I have a problem with flue gases condensing on my roof. I’ve got an old cap on my flue that was there before I moved in 15 years ago. I’ll replace it if I can find one that would solve the problem, though I’m looking around for rectangular flue caps and I don’t see ones with inverted cone diverters - I only see them for round caps. Any suggestions?

Also, is there nothing available to clean that condensation residue off of the roof?

What is the fuel that is being burned?

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Oil furnace, which operates a winter/summer hookup so it’s on year-round to heat the sink and shower water in addition to the baseboards in the winter.

Try this link for a square to round pipe adapter:
famco@famcomfg.com