6" stainless liner into 8"x12" clay lined chimney

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SLOOC1

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Jan 7, 2008
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MA-VT-RI
For about a month now I've been struggling with an wood burning insert install. Seems like everything I get into is a problem! Anyway my latest issue is my chimney size. Chimney is about 22' high lined with 8x12 clay tiles. The insert can be set up two ways #1 is a direct connect from the stove up to the first tile liner and #2 is a full reline from top to bottom. I want to do the full reline. I have attempted to find similar diameter items like a clorox bottle down the chimney. The clorox bottle made it...a can of paint did not. I'm guessing the outside diameter of most flexible stainless liners is 6 1/4" or so. I was looking to buy a 6" M flex kit...but I cannot get a exact outside diameter. Another question I have is regarding stainless rigid. Is there any chance that a 6" rigid is thinner than a 6" flexible liner? I'm also aware of ovalized liners & know that they will fit. However if possible I would like that to be my last option. If anyone can direct me to some info on flexible & rigid dimensions I would appreciate it.


Thanks
 
SLO,

I have the 8x12 Terracotta tiles also and had a similar experience. I was able to get a 6" liner installed the full length, but it was a pain in the a$$. I summized that the main problem that I had was that when the tiles were installed the mason did not do a clean job and left mortar sticking out into the chimney. So when trying to get the liner up or down the chimney it would get stuck on those beads/clumps of mortar. I had to do alot of manuvering of the liner back and forth, up and down to get the liner to it's end point.

There was times in the installation that I thought it was never going to make it to its desired loacation. All in all it took me about 6hrs over two days to feed the liner through the chinmey. The final threading of the liner into the chimney occured from the bottom up and took about 2hrs to complete.

I also had to create a 'cone' on the liner end to aid in its pulling up the chimney.

My chimney does have a zig zag that also added to the complexity of the installation.
 
I just installed a 6" flex liner in my 8" x 12" chimney. Luckily it squeezed through my damper opening without having to ovalize it only after trimming a bit from the damper opening with an angle grinder (2 minutes with cutting disc).

There is about 5' left over from my project, I just measured it, the outer diameter of the flex tube is exactly 6.25", with an ID of 6".

After reading on here, the preference is to run the liner from top to bottom.
 
My installer said my nominal 8x12 clay liner was actually 6x11 on the inside. So does 8x12 refer to the outside dimension of the liner?

He used 6" flexible stainless steel liner installed from the top down. The stack is maybe 22 feet and is straight, and it did not take him long to get the liner in. I asked him about an insulated liner and he said the small size (6x11) of the clay liner precluded using an insulated SS liner. In the future I may pour a vermiculite-based insulation into the void between the SS and clay liners for an added margin of safety and performance.
 
Hi, I installed a 6" rigid liner into an 8" x 12" clay flue about a month and a half ago. The reason I chose rigid over flex is because it is smooth inside and would be easier to clean. The chimney is straight down to a 90* thimble. It was snug, but went in pretty easy. If the clay liners are not lined up almost perfectly, I think it would be difficult to go down. It took about 4 hrs. with lunch and a beer in between. I wouldn't think you could use a rigid liner in a chimney that has any bends. It greatly improved the draftand the stove seems to run better. Hope this helps.

Jim
 
Wow I am in the same boat, don't feel so alone now. I couldn't get my cap off but i measured 7 3/4" x 11 3/4" O.D. so I assume that is 8 x 12? I am too looking into oval liner if my heating guy has trouble with the 6". I wish I would have done all this in September.
 
Ya man I hear ya.... My chimney is in good shape a straight 22'+/-. I just don't want to lug 25 feet of liner up onto my chimney & start putting it in only to find out it won't fit. Then I would be out the $400.00 I just spent for the kit! I also just noticed that the rain cap or whatever it is called has a 13" flat square base....how the hell is that going to fit up & seal properly to a 8x12 clay liner that sticks up 8" +/- from the top of the chimney!
 
Slo, my brother in-law is a metal fabricator and he made a stainless cap to fit. Call a sheetmetal shop and get a price on a custom cap. If it cost more it probably wouldn't be that much more than the 13" x 13" and it will fit better.

Jim
 
My Chimney is about 26-28' tall, I would like to insulate the last 9 or 10' that runs through the trusses and brick top. I think it will be hard to insulate that pipe using 6" in an 8x12 Clay Tile. I will call my stove supplier today to find out about oval 4 x 7.9 so I am able to wrap the top.


Kirk
 
If you ovalize the 6 inch pipe a bit you can get it down the 8X12. You can even wrap it with foil/wool; at least until you hit a bend or something. If you do hit a bend in the flue you then have a problem and are most likely going to need to use rigid flex from that point down and ovalize that a bit as well.
You may also have a problem with getting the T with clean out down there. If it gets hung on the bend, you might have to trim it down a bit and install it through the thimble. (hopefully you have a big enough opening to do so)
 
Thanks again guys! That last link has a lot of what I'm looking for! I wish my supplier had told me that I had the option of getting a cap that would fit my 8x12 clay liner perfectly like yours! It truly is amazing the amount of knowledge shared on this site! I never knew that many people were interested in stoves, chimneys etc... I already have my damper frame loose and I will be able to get the entire frame out with no trouble other than a mess!! My stove has a top mount flange so hopefully it will be an easy connect. Check these pictures out. The stove came with an oddball 7" oval flue collar. I had my local steel shop make up a 6" round to replace the oval. I hope this all works out & I will install this weekend.
 

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my flex liner measures 6.25" as well. mine went down an 8" x 8" chimney, an 8" x 12" sounds too easy. you've got the right idea, find something 6.25" round and lower it down.
 
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