Thimble necessary when going through masonry wall?

[Badfish740]

Is any kind of thimble necessary if you're going through a cinderblock wall? If not, can you simply pass a length of pipe through an appropriately sized hole and seal with rockwool, etc...?

 

[Yagminas Masonry and Wood-heat]

In short, yes. Need more info though, is this a liner installation? If so you could get away without it but if its just stovepipe to the wall, then definitely.

 

[jtp10181]

Lots of variables here. Need more info. Consult the pipe manufactures installation instructions also (many can be found online).

 

[savageactor7]

Yup, think about old proverb ...'Fire is a good servant but a bad master'.

 

[Skier76]

I beleive so. The good folks here have helped me out quite a bit. I have an insulated thimble going through a block foundation. When asking about sealing air gaps, they still recomended 2" or so of clearance, so insulation was a no no. That being said, you'll want something designed for going through the block.

 

[rdust]

If you go to youtube and search for chimney liner depot they have a video showing a liner install and one showing a liner termination. I believe they say as long as you're passing through a masonry wall into a liner a thimble is not required and they show either using 2100* high temp insulation or high temp cement to seal the gap.

 

[Badfish740]

Answered my own question (I think):

2. For a noncombustible wall (concrete block or poured
foundation), cut a hole 3/16" greater in diameter than
the outside diameter of the chimney as per Table 4.

If I print the installation manual it should be good enough for the inspector correct?