Putting in a bigger thimble

Putting in a bigger thimble

PostBy: szembek On: Thu Jul 12, 2007 9:16 am

I'm replacing my thimble through my foundation, and I have to make the opening bigger. The old cracked thimble was 5" and I am putting in a new 6" thimble. Anybody have any advice for the easiest way to enlarge the opening? The foundation is cinder block and I think chiseling away at it would knock off too large of chunks. I was going to take a grinder and grind away at it. It will create a lot of dust, but so far this is my best idea.
szembek
 
Stove/Furnace Make: Keystoker
Stove/Furnace Model: A120

PostBy: WNY On: Thu Jul 12, 2007 9:46 am

Get a small concrete drill bit and drill a bunch of holes around the perimmeter, then knock it out with a hammer/chisel. may not be too bad.
WNY
 
Hot Air Coal Stoker Stove: Keystoker 90K, Leisure Line Hyfire I
Coal Size/Type: Rice
Stove/Furnace Make: Keystoker, LL & CoalTrol
Stove/Furnace Model: 90K, Hyfire I, VF3000 Soon

PostBy: szembek On: Thu Jul 12, 2007 9:48 am

Yeah I might try that to get it close to the right size, and then use the grinder if I need to when it's close. That would cut down a lot of dust.
szembek
 
Stove/Furnace Make: Keystoker
Stove/Furnace Model: A120


PostBy: Yanche On: Thu Jul 12, 2007 10:08 am

I use the series of holes method, but with a helper board. I first drill holes in a piece of plywood in the pattern I want. Then I fasten it to the block. Then it's much easier to get the masonary drill started where you want it. The template also allows to drill the holes closer together so that next step, shaping to size is easier.
Yanche
 
Stoker Coal Boiler: Alternate Heating Systems S-130
Coal Size/Type: Anthracite Pea

PostBy: szembek On: Thu Jul 12, 2007 10:21 am

That's a very good idea, I'll be using a template for sure. Why I didn't think of that I don't know!
szembek
 
Stove/Furnace Make: Keystoker
Stove/Furnace Model: A120

PostBy: szembek On: Fri Jul 13, 2007 11:26 am

Ok one last question, i got the hole through the foundation big enough now, but I have to enlarge the hole into the chimney/flue too. I'm a little worried though, because the flue itself is 6" wide x 5" long. The opening to the thimble is 6" across, but the entire thing is about 7" across. I'm not sure that this size thimble is appropriate. Do I just get it inside the thimble and flush with the hole in the flue? Or should I be using a smaller thimble?
szembek
 
Stove/Furnace Make: Keystoker
Stove/Furnace Model: A120

PostBy: WNY On: Fri Jul 13, 2007 1:09 pm

Found this on the internet for stove (I think wood) but should apply to any type of aux. device hooked to a chimney. Hope this helps.
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WNY
 
Hot Air Coal Stoker Stove: Keystoker 90K, Leisure Line Hyfire I
Coal Size/Type: Rice
Stove/Furnace Make: Keystoker, LL & CoalTrol
Stove/Furnace Model: 90K, Hyfire I, VF3000 Soon

PostBy: WNY On: Fri Jul 13, 2007 1:09 pm

double post. Sorry.
WNY
 
Hot Air Coal Stoker Stove: Keystoker 90K, Leisure Line Hyfire I
Coal Size/Type: Rice
Stove/Furnace Make: Keystoker, LL & CoalTrol
Stove/Furnace Model: 90K, Hyfire I, VF3000 Soon

PostBy: Yanche On: Fri Jul 13, 2007 1:43 pm

Ideally in new masonry chimney construction one of the vertical clay flue liners would have been purchased with a opening for the thimble. Then it's a easy job for the mason. Many don't make it easy for themselves. They just cut, grind or chip a hole in the side of the vertical clay liner. The thimble should extend slightly beyond the interior of the chimney's flue liner. Again ideally the mortar used for the clay tile joints should be refractory cement. Many masons just use ordinary brick or block mortar, hopefully Type S.

If your replacement thimble outside diameter is larger than the inside width of the clay liner you have a problem. The only choice is to go with a smaller size that will fit. Be careful cutting or sizing the clay tiles. It's easy to crack it. A abrasive wheel works the best.
Yanche
 
Stoker Coal Boiler: Alternate Heating Systems S-130
Coal Size/Type: Anthracite Pea

PostBy: szembek On: Mon Jul 16, 2007 9:58 pm

That's what I thought. It didn't click until I actually put the thimble up to the flue though. So it seems that the only appropriate thimble I could use would be a 5" diameter thimble. Is this too small for an anthracite furnace? The chimney I have measures 6" x 7" on the interior. It appears to be in good physical condition with no cracks in the flue. If I did use a 5" thimble I would also need 5" stovepipe coming out of the stove, correct? Thanks for all your help.

I forgot to mention, it is an exterior chimney single story.
szembek
 
Stove/Furnace Make: Keystoker
Stove/Furnace Model: A120

PostBy: Yanche On: Tue Jul 17, 2007 12:29 am

I see you were considering a Keystoker A-120 or a Koker. Given that you will only have a 5-inch thimble the A-120 will not work because it has an 8-inch flue requirement. The Koker has a 6-inch flue. You would use 6-inch stove pipe to the thimble use a reducing adapter there to step down to 5-inch. I'm not familiar with any of the Keystoker products but are you sure they will work with your single story chimney. I'd measure your chimney's draft with a draft guage or inclined manometer and compare it to what Keystoker says is needed.
Yanche
 
Stoker Coal Boiler: Alternate Heating Systems S-130
Coal Size/Type: Anthracite Pea

PostBy: szembek On: Tue Jul 17, 2007 7:18 am

Yeah I'm going to have to get in touch with keystoker to determine what I need for certain. The A120 has been purchased, if needed I'll tear the old chimney down and put up an appropriate one.
szembek
 
Stove/Furnace Make: Keystoker
Stove/Furnace Model: A120