Installing Insulated SS Liner in Metal Chimney?

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CJRages

CJRages

Member
Oct 20, 2009
248
Mid Missouri
Has anyone had experience installing an insulated ss liner down a metal chimney? Ours is a tri-walled, air cooled metal - ZC fireplace chimney built 30 years ago. The pipe is 8 inch - we would run a 6" liner. One dealer said that he flat will not install a liner that is insulated b/c it gets snagged/stuck on the metal chimney sections and is too difficult to install. Another dealer (30 miles further away and $250 more expensive) said he would do it, but has had some difficulty installing an insulated liner in ZC metal chimneys.

I appreciate any thoughts or comments. :)
 
It's done every day. Many folks with triple wall opt for an uninsulated liner anyway. The chimney would have a ss 2100 degree liner surrounded by a second ss pipe (air cooled) surrounded by a 3rd pipe(air cooled or wool insulated) all encased in a 4th galvanised one. I don't think much is going to get through that with or without insulating the ss liner.
Joe
 
Do we know of anyone that has installed the InsulFlex product yet? I'm sure it's a great product, but I'd like to hear some feedback on what users have experienced.
 
An insulated liner in an 8" ZC chimney is a huge PITA. If there are any offsets it increases the difficulty, if there are two offsets, just give up now.

If you read the install manual for your insert it probably state the liner system must meet UL1777 when installed in a prefab flue. No single wall SS liner meets UL1777 by itself. This is why it should not be installed without insulation.
 
CJRages said:
Do we know of anyone that has installed the InsulFlex product yet? I'm sure it's a great product, but I'd like to hear some feedback on what users have experienced.
Click to expand...

I have one in my garage waiting for time to install it. Maybe this weekend as I will be on vacation.
 
jtp10181 said:
An insulated liner in an 8" ZC chimney is a huge PITA. If there are any offsets it increases the difficulty, if there are two offsets, just give up now.
Click to expand...

jtp10181 - what is your definition of an "offset"? The idea I'm getting is maybe where the pipes connect, the angle of the metal chimney changes slightly from joint to joint? I have looked down from the roof and up from below the chimney and it appears straight. I agree with you though... it would likely be a pain to install once I'm actually up there trying to force a 7-7/8" sized liner down an offsetting 8" pipe.

jtp10181 said:
If you read the install manual for your insert it probably state the liner system must meet UL1777 when installed in a prefab flue. No single wall SS liner meets UL1777 by itself. This is why it should not be installed without insulation.
Click to expand...

Yes you are correct about the manual. In fact...
"A full stainless steel rigid or flexible flue liner meeting type HT requirements (2100°F) per UL1777(U.S.) or ULC S635 (Canada) must be used for both safety and performance. The liner must be securely attached to the insert flue collar and the chimney top."

So the only way to achieve UL1777 or 2100* with a SS liner is to have it insulated. Correct?

Thanks!
 
Offset would be an elbow, like a 30 or 15 deg elbow kit. Straight is good.

And yes, for a single wall SS Liner you need insulation to meet UL1777

You could probably fit simpson duraliner round rigid pipe (double wall pre-insulated) down easily but its more expensive.

You could do a 1/4" insulation wrap instead of 1/2" which technically does not make it meet UL1777 but something is better than nothing.

You could do a 5.5" or 5" liner which saves you a little room, a lot of stove are not "approved" for them yet, but reports on here have been that they seem to work fine.
 
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