Looking at a liner

[RnG17]

Been looking at some liners for my external chimney. Just built this past fall. I have a totally new set up, chimney, stove, etc.


Just looking for guys that have an external chimney, and then put a liner in and what were the results?

My chimney drafts great, usually get around the 8hr burn time, things seem ok, but I'm sure I would benefit from a liner.

Also if I do get a liner, I'm guessing from my readings I should insulate it as well?


Thanks guys!

 

[EatenByLimestone]

I have a 25 foot external block chimney that has a terracotta liner. My father burnt coal in it for years through the 8x14{?) flue. When I inherited the house I yanked the old Shanendoah that was warped and worn out and installed an Englander attached to a new, insulated 5.5" liner. I also stuffed extra kaowool around the air space between the liner insulation and the terracotta on the top. Any heat that escapes I'd like to stay in the chimney as long as possible to keep temps up. It drafts in the middle of summer without a fire in it now.

Matt

 

[Fsappo]

Id line it, as far as insulating goes, what are the inside dimensions of the tile? I'm guessing your looking at a 6" liner or so based on your sig.

 

[RnG17]

Yeah right now the chimney is 7"x7". So a 6" liner should work, not sure how much room will be left to try and insulate it, but like the post above said maybe just insulate the top to keep some warmth in the chimney area.

 

[gpcollen1]

You say your chimney drafts great but you cannot really quantify it until you compare it to when it drafts like it is designed. A 7x7 flue is quite large as compared to 6" round. I bet you will enjoy the difference..

I would just install the liner and not worry about the insulation - or insulate the top of the block off plate and be done.

 

[RnG17]

Thats what I'm thinking, with a smaller and round liner it should draft even better and better draft is always a good thing.

 

[pen]

if your flue tiles are very straight, a 6 in liner is still a tight fit. My tiles aren't bad and I had a 7 1/4 by 7 1/4 in opening and it was a shimmy to get a 6 in SS flex liner down it (remember it's 6 in inside diameter). No chance of you getting an insulated 6 in liner down it. How tall is your chimney? If it is a tall chimney, I'd definately go w/ a 5.5 in liner to ensure you have no headaches. My chimney only holds 16 feet worth of SS so I didn't want to go 5.5 in unless I really had to so I purchased the 6. Boy was I sweating that decision for a while. If you do go w/ a 5.5, I'm still fairly certain you won't have room for a fiberglass insulated liner. Instead you'll have insulate w/ something like vermiculite or perlite.

Here are a bunch of topics you may consider perusing regarding chimney lining.

https://www.hearth.com/econtent/index.php/forums/viewthread/57940/

https://www.hearth.com/econtent/index.php/forums/viewthread/58412/

https://www.hearth.com/econtent/index.php/forums/viewthread/48957/

https://www.hearth.com/econtent/index.php/forums/viewthread/44852/

https://www.hearth.com/econtent/index.php/forums/viewthread/22360/

https://www.hearth.com/econtent/index.php/forums/viewthread/59325/



pen

 

[RnG17]

Thanks Pen good info. Yeah your right mine is 7 1/4 as well. Its 25ft high, straight as an arrow.

I think I'll do a few months research and make a decision in spring. I feel like I am going to have to do this eventually why just not do it now and enjoy the better draft.

 

[leeave96]

My chimney has a terracotta liner in it that had an ID of 6-5/8 square and an OD of 8 x 8 square. I wanted a 6 inch liner in it. Before the liner install, I thought my draft was OK. I had a sweep knock out the terracotta liner to make room for a 6 inch rigid liner with 1/2 inch insulation.

With the new liner, my draft is much much stronger to the extent that my damper settings had to be re-learned as a result. My stove burns much better and I am a happy camper.

If you have a straight shot, go with a rigid liner. Also, simpson duravent liner, 6 inch, has an OD of less than 7 inches and is zero clearance that may just fit down your chimney without knocking out your terracotta liner.

Bottom line is a new 6" liner ought to improve your draft.

Good luck,
Bill