Thimble question.

[ajbabug]

Installation details..
Brick hearth on brick floor. stone facing on masonry chimney.
Based on interior of chimney, it was originally built as a fireplace as is is wider at the base, smoke shelf and location for damper evident in the construction. Also construction is firebrick as it tapers to the flue tile.
At some time, the fireplace opening looks to have been closed in and an opening through to the chimney opened up 51" above the hearth. The opening is about 30" from the first tile.
From the opening, distance to any combustibles is greater than 24". (26" to sides of chimney, 32" to ceiling)
Opening is appx 9 1/2" in diameter, lined with mortar. (do not believe it is high temp mortar)
Attempted to acquire round clay thimble, have not been able to locate on within 100 miles. (limited distribution in Fl)
Awaiting delivery of Copperfield (type) galvanized thimble.
Specified as 8" X 12". Is the ID actually over 8" allowing the 8" stove pipe tp pass through?
8" pipe coming off the stove.
Anticipating setting thimble into opening using high temp mortar.
Routing stove pipe through thimble and up to first tile in chimney, appx 36" above opening.
Situation is somewhat unique as it is not quite a stove into a fireplace installation, nor is it a stove to chimney flue either as the opening/thimble location is still where the "fireplace" tapers up to the flue tile.
Any comments or suggestions?

 

[begreen]

If the new thimble ID is 8" I don't think stove pipe will pass through it. It sounds like it is designed to take a crimped pipe end inserted into it.

I would consider a full liner, especially if this is a one-story flue in FL. What is the chimney tile ID? What stove is connecting to this setup?

 

[ajbabug]

Tile is 11 X 11, stove 8" round so well over 25% .
Later model Fisher when they transitioned to UL Approved units.

Information on the galvanized thimbles is sketchy.
Descriptions tend to indicate they are sized to allow pipe to pass through.
One seller stated that outright.
Won't know for sure till it gets here. (had to order on line as local supplies are almost non existent)
Most descriptions on thimbles seem to indicate they are 26ga.
Does not make sense to go from 24ga stove pipe to 26ga thimble to pass through to the chimney.
To use the thimble as a "sleeve" for the stove pipe seems more reasonable considering the difference in thickness.
Expect appx 1/2" of high temp mortar around the thimble.

Just curious of the reasoning for a full liner? (draft issue?)

 

[begreen]

26 gauge is lightweight stuff. It sounds more like a form to mortar against than a thimble.