DIY Home Improvement, Remodeling & Repair Forum > DIY Home Improvement > Bricks, Masonry and Concrete > Cracked Fireplace Flue Lining




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Old 03-01-2012, 01:58 PM  
harvman11
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Default Cracked Fireplace Flue Lining

Hello,

I recently bought a home with a brick fireplace (I think the fireplace was built in the 60s or 70s, so 40-50 years old), and today I had it cleaned and inspected. The inspector found cracks in the tile flue (he said evidence of previous chimney fires), and didn't really give me a straight answer about the safety in its current condition. He told me that to cover himself legally he couldn't recommend we use it in its current condition, and went on to talk about replacing the flue with a steel insert.

I don't doubt the intentions of the sweep, I think they were very professional, it was certainly not a high pressure sales situation or anything, I just think he didn't want to say something that could legally get him into trouble, which I completely understand. I'm not opposed to putting in a flue liner, but I'm not in a situation where I can do it now, and I'd like to use my fireplace.

So, my question is essentially this: is it dangerous for me to use my fireplace, in its current, sweeped-but-cracked condition, at least in the short term (the rest of the winter)? I've attached a couple pictures of the damage he indicated, thanks in advance.

Also, if this isn't the proper place to ask such a question I apologize, I'm new here.



chipped.jpg   crack.jpg  
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Old 03-01-2012, 09:45 PM  
BridgeMan
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If $$$ is tight, I'd recommend borrowing on your place's equity if you're in a position to do so, and invest in a properly-installed liner. Having the place burn down because you want to burn some wood won't be any fun, and getting future homeowners insurance will be difficult, all because of a poor decision having been made.

On the other hand, if the only damaged flue sections are near the top, they are a fairly simple DIY-er replacement job. I replaced the top 2 sections of a 25-yr.-old place a few years ago, and extended the chimney 2 more sections for better draft. Took more than a few weekends including the c.i.p. concrete cap, but it was not a difficult project. Had to use a special, heat-resistant mortar to set the tile flues (stuff came in a large can). Finding matching brick for the outside was the biggest challenge.



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Old 03-02-2012, 05:27 PM  
kok328
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Based on the pics shown, I don't see any reason why you could not continue to use the fireplace. Just my opinion and I'm no expert on chimneys.

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Old 03-02-2012, 06:17 PM  
nealtw
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One visiable crack should show the need for a camera inspection, Cracks allow heat to get to the brick and morter which can not take the heat. The brick will crumble from the inside out, and dosn't show up until it is to late. We don't know how long the cracks have been there. I would not use the chimney.

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Old 03-02-2012, 07:18 PM  
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A few cracks don't hurt. If you have big piece of clay liner missing then heat could get to the brick.
Clay flue liners are made not to cement in. They should just set on top of each other.
This way the can expand with out cracking. If you cement them in then they will crack.
The up draft in the chimney stop the heat from going through the cracks. Paul

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Old 03-02-2012, 07:22 PM  
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If you can't get it signed off on by a sweep, I wouldn't use it.

Plus, a fireplace won't give any appreciable heat into your home... you might want to consider a wood-burning insert if you're looking for an alternate heat source. But, then you'd need a liner. Check on hearth.com, lots of good info there.

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Old 03-03-2012, 08:01 AM  
kok328
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It's my understanding that a fireplace will actually suck more heat out of the home than it generates into the home.
Thus the wood-burning stoves were/are very popular.

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Old 03-03-2012, 08:12 AM  
inspectorD
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Bottom line, you need a new liner and a chimney cap. If you are not going to use this I would put a cover on the top to keep the rainwater out for long term.
Fireplaces have a negative effect on your home, heat loss is a big issue. Expecially when you have a fire, you suck all the already heated makup air to burn the actual fire, out of the home. Getting an insert or woodstove is way more efficient.
And yes your sweep is correct. The signs of past fires is evident at that top flue, even some creosote is still visible because it is impossible to get it all off.

Better safe than sorry.

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Old 03-03-2012, 06:30 PM  
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The cracked liner is unsafe to use! The steel liners will make the flue opening smaller if they just insert them in the existing liner. The better repair method would be to remove the existing tile liner and then install the steel liner and pour a special mixture around the liner.
Did you have a professional home inspection prior to purchasing the home? If so, what did the report say? If it was inspected then the inspecter didn't look in the chimney and he may be liable for not finding the damage. I usually recommend further evaluation by a reputable chimney co when I can't see down past the first couple tile liners. This goes into the settlement agreement and puts the seller on notice that there may be damage and may require repair or reimbursement. The seller did not disclose that there was previous chimney damage and you should discuss their liability for failure to report the damage. The seller's insurance company would have paid for repairs had it been reported and you should explore that now even though seller doesn't own the home at present. Your insurance company will not cover the repairs since it occurred prior to your ownership and may not want to cover any damage caused by fire until it is repaired.
Good luck.

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Old 03-22-2012, 01:18 PM  
Michaelolding1
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The purpose of your liner is and a dead ain't space around it is to provide an impervious surface for flue gases to escape along and to prevent heat sink into the surrounding masonry. More importantly though is that a cracked tile can fall in during a flue fire blocking the flue which can create a very dangerous situation depending on hot the fire is.

Either replace the tiles with drop tiles, cast in place system or stainless steel. A 10" round will equal a 12" square. Don't take the chance on a damaged flue system.



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