Do I need a Thimble?

[Fishcakes]

Hello again all. Taking your advice, I've purchased a drolet colombia 2 and plan on installing it and a 6" liner tomorrow. My chimney is clay lined, but the liner is cracked in a few places. I took out the old 8" x6" smoke pipe reducer to find that the crock ends approx 1" before the end of the brick with no gaps. Crock has no cracks or damage.

My question is, do I need to install a thimble if the are no combustibles within 5 ft considering the piping will go through the preexisting clay?

Apologies if this has been asked before, but I spent about an hour searching the site for this specific scenario and couldn't find anything. Thanks

 

[begreen]

If there is 18" or more of masonry to any combustibles in all directions, then an insulated thimble is not needed, but the 6" tee snout is going to be a bit sloppy with 1" + clearance around it.

 

[Fishcakes]

If there is 18" or more of masonry to any combustibles in all directions, then an insulated thimble is not needed, but the 6" tee snout is going to be a bit sloppy with 1" + clearance around it.

ok good news! I mean, it's an 8" crock but I'm running 6" pipe inside it to the tee.

the slop was my other concern, but I figured at least I could cover the gap with a collar. I figure no one should be touching the pipe anyway(cause it's hot!)

 

[begreen]

I would at least pack around it with 1" stove rope gasket.

 

[Fishcakes]

I would at least pack around it with 1" stove rope gasket.

I was thinking about using furnace cement around the 6" where it goes into the chimney, but I wasn't sure if it would pass inspection

 

[stoveliker]

The furnace cement can easily crack when the pipe is taken off. Something more flexible is better. I.e. rope gasket.

Can roxul be stuffed in too?

 

[bholler]

I was thinking about using furnace cement around the 6" where it goes into the chimney, but I wasn't sure if it would pass inspection

What is behind that brick facing?

 

[Fishcakes]

What is behind that brick facing?

As far as I can tell, nothing. That is the chimney

 

[bholler]

As far as I can tell, nothing. That is the chimney

View attachment 301228

Ok as long as you can be sure it is solid masonry you shouldn't need a thimble