Pro and cons of chimney insulator mix ?

[Dmitry]

I installed the 6-inch liner wrapped in a blanket in a 13-inch square terracotta flue.
There is some gap left between the liner and the flue. The original idea was to stuff some Roxul to make even more insulation.
Now looking at the installation I think about pouring in insulation mix since it will be more effective. Is it liquid enough to get past the offsets? The chimney length is 15 feet and offset in the middle. I can't get Roxul past that offset, wondering if pouring insulation will do the job.
Are there downfalls? I understand it’s getting somewhat hard after curing.
Is it possible to remove the liner once it is set in the future? What other downfalls I don’t see?

 

[begreen]

Skip it. There is no real gain vs more cost, mess, and a big pain in the but if the liner needs to be removed. Also, you don't want the kaowool liner wrapper to get wet from this mix.

 

[bholler]

I installed the 6-inch liner wrapped in a blanket in a 13-inch square terracotta flue.
There is some gap left between the liner and the flue. The original idea was to stuff some Roxul to make even more insulation.
Now looking at the installation I think about pouring in insulation mix since it will be more effective. Is it liquid enough to get past the offsets? The chimney length is 15 feet and offset in the middle. I can't get Roxul past that offset, wondering if pouring insulation will do the job.
Are there downfalls? I understand it’s getting somewhat hard after curing.
Is it possible to remove the liner once it is set in the future? What other downfalls I don’t see?

I agree with begreen nothing to gain there. I use it sometimes on old unlined chimneys to help stabilize them from inside. Also on gas or oil liners. But if it's wrapped dont bother.