Odd sized masonry thimble?

[arngnick]

I am struggling with connecting to my thimle. I have a standard 8 inch masonry chimney that is outside. My thimble seems to be an odd size 6.5" inside and slightly larger than 8 on the outside diameter.

Is this an odd size thimble that I should replace with something that would be more accepting? Or is there a good way to adapt to this...(6" is to small 7" is slightly to large and 8" almost fits on the outside of the thimble)

 

[begreen]

Do you know what brand pipe this is? If not, can you post a picture? It might be designed to use an adapter for the connector pipe.

 

[arngnick]

I cannot get a picture. I am currently hooked to it using a flashing adapter (my flue temps stay low) It is a clay thimble run through a poured wall. the inside measurement is 6.5" and the outside is slightly more than 8".

 

[arngnick]

I cannot get a picture. I am currently hooked to it using a flashing adapter (my flue temps stay low) It is a clay thimble run through a poured wall. the inside measurement is 6.5" and the outside is slightly more than 8".

For clarification: By inside and outside I mean inside diameter and outside diameter.

 

[begreen]

In that case I think I would just pack around the connector pipe with some stove gasket material for a tighter seal.

 

[arngnick]

What I have is working, I just want to know the correct way it should be done. I have an 8 inch pipe going almost around it with flashing that bridges the gap. I may just find something that fits and weld a flue box with the proper size pipe that fits inside. Or I could always replace the flue with something that is more standard. Just seems to be odd size no standard size pipe will fit.

 

[begreen]

Hard to say. It doesn't sound like an intended connection. Again, a picture is worth a lot here. There could be issues that are not ok that we are not seeing. Is this single wall pipe? If so how are clearances to combustibles?

 

[arngnick]

My flue temps run 400 on the high side. The thimble is clay and I have an 8" single wall pipe goint to it. Combustables are at least 30" away.

 

[arngnick]

\

It is one of these through a poured wall with the measurementslisted above.

 

[Tehvine]

Did you ever find a solution to this? I have the exact same problem. My only other issue is that the stove has an 8" outlet. When I came into this, the 90deg elbow was just jammed into the thimble and leaky as can be. I have made it a little better by undoing a section of 8" stove pipe and sliding it into the wall. I have an 8" to 6" reducer that pokes into that for a much better seal. I just need something that will work better until we run a new chimney straight out of the roof.

 

[arngnick]

I have not...I plan to do some more research and replcae the timble soon. Let me know how you make out.