SS Chimeny Liner Insulation for Coal???

Ok so my clay flue is cracked and chipped pretty bad I got a good deal on a ss liner my question is do I need to insulate it the chimney is 25 ft so I'm not really worried about that and as far as I can tell from what I read besides that the insulation helps with creosote build up but I'm going to be burning coal so do I need to shell out extra bucks for insulation? Plus the liner is 7 inch and my flue is 7.5 by 7.5 so I don't know if I'd even have the Clarence for insulation please if anyone is well read on this topic or an expert let me know ur advice

Not really worried about DRAFT* SORRY about the typo

Coal country wrote:Not really worried about DRAFT* SORRY about the typo

But you do need to be worried about the acidic vapors condensing and eating through your SS flex liner in a couple few years, my friend.

The insulation helps to hold a higher temperature in the thin metal to keep the vapor to stay a vapor all the way up and out the top of the pipe.

Hardly any warranty ever covers these for replacement. Some will tell you they will warranty them, but it MUST be Professionally Installed and Professional Cleaned each and every season and all must be documented.

If you got a good deal on a Cadillac would you skip buying insurance for it by thinking you'll never have a crash?

BTW: Insulation gets a SS mesh sock fastened over the insulation which cannot help but compress the insulation some (reducing the OD) and does provide a bit of protection from dragging insulated flex down inside the chimney walls.

Even though I like insulation, so little could be placed, as you noted, I would not bother. Sealing it well at top and bottom the trapped air will insulate as well.

If your chimney is inside rather than along an outside wall, then no insulation is best.

Burn only dry coal for least corrosion and start each season with a good hot wood fire and end with one as well.

Keep rain out with chimney cap.

Thanks for the help guys and to add the chimney is inside in the basement through the basment and the first floor then comes out of the first floor roof and runs up the outside of the second story so I'd guess about 60% inside and 40% outside

Sell the thing and forget about it. Unless you have holes in your masonry chimney, you don't need it and the grief you get with it.

There are NO good deals on SS. Chips & cracks won't bother a thing. How does pointing look on chimney?

Well it was 200 for 35 ft so if it'd be any benefit I wouldn't mind installing it. pointing isn't bad it's a cinder block chimney that are full hollow square on top of one another so not manyjoints some have gaps but can't get at the side right against the house anyways

AL29 Stainless Steel is the most corrosion resistant material currently used. I have one that is five seasons old now and it's mint. I get it cleaned immediately after the stove is shut down and disconnect the stove from the chimney so the liner can stay as dry as possible. I'm confident I'll get 10 + years out of it.