chimney liner - will 15' be enough?

Pellet_Pete · Mar 1, 2015

Now that I'm in possession of a stove (a great craigslist find - blue/black enamel Jotul F3), it's time to fine-tune the rest of my installation. I need to line the chimney, and I've got exactly 17 ft. from fireplace floor to top of masonry. Centerline of the flue outlet, rear-vented, is 22.5" up - add 3" for pipe diameter and that puts me at 25.5", leaving me with 14' 10.5" to the top of masonry. I'm not sure, but it seems like a 15' liner would maybe be a tad bit short...but then again, does the tee add a couple inches vertical, and is 2 or 3 inches enough at the top to secure the cap? Getting a 20' liner isn't that much more expensive, but I'd hate to cut 5' off of it when I might just have a perfect setup. Advice?

And the obligatory stove pic.

begreen · Mar 1, 2015

Sounds like it's going to be close. I would order 20'. As the saying goes, an inch short is the same as a mile short. If you choose to go with the 15', it might be ok with the tee. That will add about an inch and you want an uphill slope away from the stove. On top I'd want at least 3" above the top of the chimney. Measure again to be sure if you choose the 15' length.

If you decide to go for the 15' and find yourself coming up short you could splice on additional liner with a coupler if needed. But that will probably cost more than just ordering the 20' to start with.

Pellet_Pete · Mar 1, 2015

begreen said:
Measure again to be sure if you choose the 15' length.

Good call - once I can get on my roof again, that is!

begreen said:
If you decide to go for the 15' and find yourself coming up short you could splice on additional liner with a coupler if needed. But that will probably cost more than just ordering the 20' to start with.

Very good point. I think the extra 5' of liner is only $50 and the coupler is $40 or thereabouts. Better to have one piece. So, my plan is to default to the 20', unless I discover a few inches upon re-measuring from the top down. Thanks again begreen. ==c

Follow-up question - Jotul recommends minimum 14' chimney for the F3. With 15' & rear vent with an insulated liner, is it worth considering a smooth wall product?

begreen · Mar 1, 2015

No, I think you should be ok with the regular insulated liner. Our F3CB was on a 12ft straight-up chimney and it burned well. Word is that the 2 ply smooth wall stuff does not stand up. If you are going to spend more money go with a heavier gauge liner.

jeffesonm · Mar 1, 2015

Is it a straight shot to the top? Mine is a single story and only 14' from T to top of masonry... I went with rigid DuraLiner and have it sticking up another 2.5' or so out or the masonry for like 16' total.

anthonyj124 · Mar 1, 2015

I'm not sure where you were looking to buy liner from, but I've got a couple good feet of 6" chimneylinerdepot flex king left over from my install. Your profile says Franklin City, which I THINK is the same Franklin near Foxboro. If so, we're neighbors.

If you ordered the 15', I've got a short length you could use if you wound up short. Though the difference between 15' and 20' of liner probably isn't much different than the cost of a coupling.

Pellet_Pete · Mar 1, 2015

anthonyj124 said:
Your profile says Franklin City, which I THINK is the same Franklin near Foxboro. If so, we're neighbors.

Lol, I'm in Franklin County, the poorest & most rural county in Mass, worlds apart from the town of Franklin. Thanks for the offer though!

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chimney liner - will 15' be enough?

Pellet_Pete

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begreen

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jeffesonm

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