Liner install questions - How to insulate?

[southland]

I purchased a used Buck 51 wood burning insert that I want to install in a masonry chimney. I had the chimney checked and it is in good shape, but the clay liner is 8"x12", with the small side inside width of 6.5". The insert is designed for a 6" flue. I want to line the chimney for safety. If I use a 6" liner, I don't think that I will be able to wrap it in insulation. Should I use a smaller liner (maybe 5.5"), don't insulate, use an oval liner (higher cost), or something else? The chimney is about 15' tall and I live in northern Alabama. I want the install to be safe, but at a reasonable cost.

Thanks.

 

[mellow]

ID of my flue was 11.75 x 6.75 and I was able to fit a 6" flex with 1/2 inch thick insulation. It was VERY tight, but with a pull cone we got it down without having to ovalize.

 

[southland]

ID of my flue was 11.75 x 6.75 and I was able to fit a 6" flex with 1/2 inch thick insulation. It was VERY tight, but with a pull cone we got it down without having to ovalize.

How tall is your chimney? I wonder if the insulation is still effective when it's compressed?

 

[begreen]

If this is for an interior chimney I'd go for the uninsulated liner Southland.

 

[mellow]

ID of my flue was 11.75 x 6.75 and I was able to fit a 6" flex with 1/2 inch thick insulation. It was VERY tight, but with a pull cone we got it down without having to ovalize.

How tall is your chimney? I wonder if the insulation is still effective when it's compressed?

25 ft. Its only compressed where the flue tiles meet, you will probably notice with yours they are uneven and stick out quarter of an inch. Thats the only reason it was a tight fit for me. Liner should still work fine compressed or you would see warnings stating it can not be done.

 

[southland]

If this is for an interior chimney I'd go for the uninsulated liner Southland.

I forgot to state in my original post that it's an exterior chimney.

 

[n6crv]

Just a thought but what about filling the void with Vermiculite ? I used the coarse and it was a easy way to go.
Don

 

[mellow]

With that tight of a fit I do not see how you could work the Vermiculite around the entire liner, but then again I have never used Vermiculite before.

 

[n6crv]

With that tight of a fit I do not see how you could work the Vermiculite around the entire liner, but then again I have never used Vermiculite before.

It does come in different sizes. The corse that I used is at the most pea size. It comes in a 40lb bag and that is a big bag as it is very light. Just pour it in then give the liner a shake to kind of move it around. It is the stuff they put in potting soil to keep it from getting hard. The nice part is it is fire proof.
Don