Non Combustible wall ideas for stove pipe pass-through to chimney

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Juniperlynn
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Post by Juniperlynn » Sat. Dec. 08, 2018 1:39 pm

Hi all,
We had a new Hitzer 354 installed in our lower level. The previous homeowner had a wood stove in the same location at one point, but removed it and covered the opening through the block to the chimney and then dry-walled the wall. We removed the drywall and any combustibles in that area, found the original access to the chimney flue and had a professional install the stove, 8" stainless chimney liner, and 8" single-wall stove pipe. Photos below show the area in question.

We are a bit puzzled as to what we can use to cover the wall area per fire code. We've asked the place where we purchased the stove as well as the chimney guy with no real answers. We know that we need 18" of clearance to non-combustibles. We thought about using hardie board siding since it is non-combustible, but would need to paint it (we assume painting it would deem it combustible). We were told that a thimble will not work with our set-up, so any ideas on what would be a safe (and hopefully aesthetically pleasing) solution to the wall?

(The lower portion of the wall directly behind the stove is limestone which is set about 4" away from the block wall. We would love to finish the whole wall with the limestone, but it's not in the budget at this point).
Thanks in advance for your suggestions!

Attachments

Pipe.jpg
.JPG | 289.6KB | Pipe.jpg
Stove.jpg
.JPG | 337.7KB | Stove.jpg
Wall.jpg
.JPG | 319.3KB | Wall.jpg

 
titleist1
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Post by titleist1 » Sat. Dec. 08, 2018 2:23 pm

I'm not sure why you cant use something like this wall thimble to give the clearance you want? Use metal studs if you prefer. If you don't want to paint the cement board within the 18" of the stove pipe then use a larger decorative metal ring.

https://www.northlineexpress.com/8-duratech-wall- ... gL8__D_BwE

 
CapeCoaler
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Post by CapeCoaler » Sat. Dec. 08, 2018 10:04 pm

They should have run the insulated pipe thru the wall...
Then you would be able to use a small metal thimble...
The Thimble must be installed with DuraTech Chimney pipe horizontally through the wall and extend 6" into the room beyond the interior wall.
cement board with a tile or stone veneer will work...
Brick too but not a good visual pairing to the limestone...

 
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McGiever
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Post by McGiever » Sat. Dec. 15, 2018 1:08 pm

Was the previous wood stove set up in some kind of violation? Or was this thimble idea borne by the guy who sold you the needless chimney liner?
Your present coal setup is far less hazardous in all areas of concern now compared to what that wood stove ever was.

Chimney fire will be non-existent and temperature of flue at that location will be a fraction of what a wood fire would be.

I'd adjust shims on all four sides to accept or allow a piece of 5/8" drywall and then tape and mud the four seams, add some paint and maybe a decorative trim ring and call it done...

FYI: 5/8" drywall has a 45 Min fire rating and paint is a non-issue...but common sense should apply here too.


 
CapeCoaler
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Post by CapeCoaler » Sat. Dec. 15, 2018 10:19 pm

The fire rating on dyrwall is burn thru time...
The paper WILL burn...
Cement board and a skim coat...
Coal does not burn as hot as a wood fire...
But if there were to be any problems...
Insurance may be jeopardized if install is improper...

 
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McGiever
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Post by McGiever » Sun. Dec. 16, 2018 10:41 am

Whatever allows you sleep well at night, go for it...

 
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PFrank
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Post by PFrank » Tue. Jan. 15, 2019 7:31 pm

I'm with CapeCoaler.

 
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lsayre
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Post by lsayre » Wed. Jan. 16, 2019 7:40 am

This fire rated wall board comes in 4' x 4' and 4' x 8' sheets:

http://www.homasote.com/products/ncfr-homasote

I have no real idea as to its suitability here. It is 1/2" thick.


 
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Riddlerlloyd
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Post by Riddlerlloyd » Wed. Jan. 16, 2019 1:02 pm

It’s too bad that thimble is offset and not centered. If it was centered the hardi board and some of those mosaic concrete tiles would have looked nice.....not sure if cost or labor is an issue but I’d take out all the drywall and put in stacked stone veneer for the whole wall. Having something different in that one offset area would bother me too much....you could get unpapered or fire rated drywall and build it up even then skimcoat and paint it to match too

 
CapeCoaler
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Post by CapeCoaler » Wed. Jan. 16, 2019 8:24 pm

This fire rated wall board comes in 4' x 4' and 4' x 8' sheets:

http://www.homasote.com/products/ncfr-homasote

I have no real idea as to its suitability here. It is 1/2" thick.
Fire rated means it will burn...
Non-combustible = does not burn...
You could also tint UGL drylock masonry paint...

 
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Post by Bubbalowe » Thu. Jan. 17, 2019 10:19 am

OP is constrained by budget and their original idea of hardie backer is most feasible, IMHO. Question is which coating to use considered non-combustible to paint upper wall?

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