I have searched the web and went through the suggested liner posts and could not find anything related to my issue. What are the ramifications to having a flexible stainless steel 6” liner inside of an existing 8” rigid chimney liner? We pulled the 6” liner trying to find out why the previous owner had done this and after running a camera through the 8” rigid liner we found separated sections. My stove only requires a 6” liner my other question is should I insulate the 6” liner? I have a wood burning lopi stove republic 1750.
Chimney liner within a liner
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mellow
Resident Stove Connoisseur
Can you pull the 8" liner out? Insulated 6" liner won't fit in it, maybe 5.5" insulated liner would. How tall is your chimney?
Agreed. Is this a proper 8" stainless rigid liner? If the sections are separated why not pull them out and correctly rivet them together with ss pop rivets?
I could probably pull the 8" liner out but I just found on the lopi website the install instructions for my stove using the Duravent 1777 stainless steel liner. This is supposed to be used when installing in a non-masonry chimney and it actually shows running the flexible liner through the rigid existing liner without an insulation blanket. My big concern has been the chimney technician told me I should not have a liner within a liner.
tfdchief
Minister of Fire
xtrordinair
Member
theres nothing wrong with putting a liner in another liner .if the 8 inch is coming apart i would try to get it out just so i could insulate the 6 inch properly.
Oregon aloha
Feeling the Heat
I would think the 8" would act as insulation for the 6" pipe. The only down side I can see is overkill with both liners, unless the separations in the 8" are large enough to cause too much heat loss.
The air space outside the 8" liner will help to keep the cold out and the air space between the 6" and the 8" will heat up and keep your liner warm.
The air space outside the 8" liner will help to keep the cold out and the air space between the 6" and the 8" will heat up and keep your liner warm.
Mellow, I don't like resurrecting an old thread, but I was wondering why the 6" insulated liner wouldn't fit. It look like there are at least some options out there that show an outside diameter of 7.25". Maybe the 7.25" OD is new and older insulated liner was thicker? I hate to order new stuff and have it not fit.
I have an 8" ss flex liner with insulation that was poured in. The insert we have is old and needs to be replaced, so I am looking at ways to install the 6" liner inside the 8" while having the option to remove the 6" if desired.
Thanks,
Tony
double-d
Feeling the Heat
The 6" Flex Liner is 6.25" on the OD, adding the 1/2" Insulation Blanket, adds about 1.5", because of the insulation overlap, making it 7.75" OD going into an 8" liner, in theory it should fit. There is always the option of using the 1/4" insulation blanket, it does not make it UL1777, but it does give you added insulation, if that is what you are looking for.
Well I can tell you I have put insulated 6" liners inside 8" liners before with no issues. We do use heavy wall liners that are a little smaller outside diameter so that may help. But regardless if your 8" is properly insulated you can just run the 6" inside the 8 without insulation.
Thanks for the reply guys. The 8" is properly insulated and only about a year old. If I use an non-insulated 6" liner, are there any issues with stabilizing it? Meaning, should there be some kind of spacer to fill the gap between the two liners so the 6" doesn't move around. Not sure if it would make a difference other than while cleaning.
Tony
Tony
No nothing is needed it will move around some when you clean but it wont hurt anything
For some reason, my last post doesn't show up (I posted right after you did).
I will give it a go. Edit: with just dropping a new 6" liner down.
Is there a reason to go with 304L vs. 316Ti? 316Ti seems to be more versatile, but 304L more durable? Google...provides just enough information to be dangerous.
I will give it a go. Edit: with just dropping a new 6" liner down.
Is there a reason to go with 304L vs. 316Ti? 316Ti seems to be more versatile, but 304L more durable? Google...provides just enough information to be dangerous.
No 304 is not more durable both will work the same for wood. But if there is any chance of you running coal oil or gas through the chimney then you need 316. But if all you will ever use it for is wood go with the cheaper alloy which is 304Is there a reason to go with 304L vs. 316Ti? 316Ti seems to be more versatile, but 304L more durable? Google...provides just enough information to be dangerous.
I know I have been asking a lot of questions and I really appreciate the help. I am hopefully down to my last one.
I have all the parts I need and will be putting the new liner in soon. The new Armor Flex liner has all the top cap parts with the clamp, etc. My concern is with the 8" heavy liner that is still there. It won't be supported at the bottom any more and to put the new 6" top cap/plate on, I will have to cut it flush with the flue tiles, right? If I do that, it won't be supported from the top anymore either. Is there a proper way to keep the 8" liner from sliding down?
There is a block off plate at the top of the smoke chamber with insulation poured on top of it. It is up so far, I can't reach it or tell if the liner is somehow attached to it (I doubt it).
I have all the parts I need and will be putting the new liner in soon. The new Armor Flex liner has all the top cap parts with the clamp, etc. My concern is with the 8" heavy liner that is still there. It won't be supported at the bottom any more and to put the new 6" top cap/plate on, I will have to cut it flush with the flue tiles, right? If I do that, it won't be supported from the top anymore either. Is there a proper way to keep the 8" liner from sliding down?
There is a block off plate at the top of the smoke chamber with insulation poured on top of it. It is up so far, I can't reach it or tell if the liner is somehow attached to it (I doubt it).
Any thoughts on how to support this from my question above (post #16)? I figure I could find a way to screw some angle brackets to the liner, but I am not sure if it is worth it or not. Maybe the poured in insulation will hold it in place?
Okay, nevermind. I just pulled some parts and it looks like it is a TherMix type insulation, so the liner won't move. I thought is was some kind of loose fill like vermiculite.
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