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How to fix this chimney flue

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  • Jun 11th, 2022 4:51 pm
[OP]
Member
Sep 23, 2019
294 posts
348 upvotes
Toronto

How to fix this chimney flue

I have a chimney with 2 flues that are not in a good shape. Both flues are not used at all - one fireplace was converted to an electric fireplace (not insert, just an electric fireplace), and the second flue was never ever used/set up since the house was built.
I would like to fix this to stop deterioration so that water would not go into the flue?
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12 replies
Member
Feb 24, 2018
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Toronto
Thanks OP , I have to same question.. I have 1 flues. waiting for suggestion from other member
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Oct 6, 2010
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Take them both down.
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Oct 12, 2007
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koffey wrote: Take them both down.
Unless the goal is to maintain the system just in case the current or future owner decides to use it again for wood-burning, I agree with you wholeheartedly. If they do want that option, I would recommend that they get the entire system inspected from fireplace to cap by a WETT certified technician as it's possible that there's more than this repair needed and it's best to know the entire bill before they tackle this one thing. The estimate could be the tipping point to encourage them to pull them down and capping the chimney.

FWIW, I've used this product in the past with acceptable results: Refractory Cement
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Apr 26, 2003
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I called up A1 Quality Chimney Cleaning & Repair to clean the chimney and repair a loose tile on my chimney last year. I got a quote to rebuild the entire thing, but the guy who came said it was still intact and just repaired the loose stone and saved me about $7K.

Oct 13.jpg
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exrcoupe wrote: I called up A1 Quality Chimney Cleaning & Repair to clean the chimney and repair a loose tile on my chimney last year. I got a quote to rebuild the entire thing, but the guy who came said it was still intact and just repaired the loose stone and saved me about $7K.


Oct 13.jpg
Did he inspect inside the flue and firebox itself? If so, you got great advice and did well.

I had to replace our chimney from the roofline up - it just wasn't going to look good being patched. But before I did, I had the entire system inspect and a few repairs done inside the firebox and flue. Now, I have the system inspected every ~5 years and cleaned out at about the same frequency.
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Yeah, had the entire thing inspected and cleaned. It wasn't used for like 30 years before we bought the house, so I wanted to ensure that it was in still good working condition before using it. Thinking of investing in a good insert though. Love the wood burning fireplace, but we got smoked out a few times and it wasn't good. There was a backdraft on the chimney for some reason and I couldn't get the flow working properly. It was perfect the night before.
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exrcoupe wrote: Yeah, had the entire thing inspected and cleaned. It wasn't used for like 30 years before we bought the house, so I wanted to ensure that it was in still good working condition before using it. Thinking of investing in a good insert though. Love the wood burning fireplace, but we got smoked out a few times and it wasn't good. There was a backdraft on the chimney for some reason and I couldn't get the flow working properly. It was perfect the night before.
Best way to prevent that, is to use a hair dryer to push the air up before starting your fire.
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koffey wrote: Best way to prevent that, is to use a hair dryer to push the air up before starting your fire.
Hmm... not a bad idea. I have a heat gun that would speed that up. I tried to prime the flue with some newspaper, but it kept on getting blown out by the downdraft. Hoping to get in one more fire before the weather gets too warm.
[OP]
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Sep 23, 2019
294 posts
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Toronto
CaptSmethwick wrote: Unless the goal is to maintain the system just in case the current or future owner decides to use it again for wood-burning, I agree with you wholeheartedly. If they do want that option, I would recommend that they get the entire system inspected from fireplace to cap by a WETT certified technician as it's possible that there's more than this repair needed and it's best to know the entire bill before they tackle this one thing. The estimate could be the tipping point to encourage them to pull them down and capping the chimney.

FWIW, I've used this product in the past with acceptable results: Refractory Cement
Thanks for the link to this "Refractory Cement", but instructions says: "Not for exterior use"
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RedFlagAlias wrote: Thanks for the link to this "Refractory Cement", but instructions says: "Not for exterior use"
Look up the company's website - they have exterior grade products.
I always upvote respectful/helpful posts wherever I encounter them.
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exrcoupe wrote: Hmm... not a bad idea. I have a heat gun that would speed that up. I tried to prime the flue with some newspaper, but it kept on getting blown out by the downdraft. Hoping to get in one more fire before the weather gets too warm.
On a windy day, I need to crack upon a window nearby the fireplace or I get some smoke coming back in - in those case, it's an air pressure effect.
I always upvote respectful/helpful posts wherever I encounter them.
[OP]
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Sep 23, 2019
294 posts
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Toronto
Just a follow-up:
I ended up using Air-Dry modeling Clay Terra Cotta color, about 16$ per 1kg on amazon: https://www.amazon.ca/gp/product/B001GAP4Y0
It does not look very good when inspecting from close by, but from far away looks OK and after few days this clay hardened very well and I was able to cover few small holes in the chimney liner and crackes in the chimney crown (you might want to use white clay for that).
I have no idea how this will hold over winter freezing cycle, but now it looks better than before.

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