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Wood Stove, any point in adding fire brick?  RSS feed

 
Michael Young
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I just bought a wood stove. The woodstove has no firebrick. It's just a burn chamber and then it looks like there's an air chamber around that to trap heat. Will I get better performance out of this stove if I install fire brick to add some additional thermal mass?
 
Mike Cantrell
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Thermal mass? No.

BUT most stoves DO have a brick floor to keep from burning through. The heat of the coals right on the steel stove floor year after year degrades it; the bricks protect the floor.
 
Michael Young
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Mike Cantrell wrote:Thermal mass? No.

BUT most stoves DO have a brick floor to keep from burning through. The heat of the coals right on the steel stove floor year after year degrades it; the bricks protect the floor.


This stove has no fire bricks on the floor. Should I add fire brick to the floor? And does it need some sort of metal grate like you have in a fireplace - to hold the wood? or do I just chunk the wood in there and set it on fire? It's been fifteen years since I've had a wood stove. I don't remember much
 
Mike Cantrell
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Yep, put firebrick on the floor. But no need for a grate. The stove should be designed so that air gets to the wood just fine.
 
Jeremiah wales
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I looked at at least 100 used stoves this year and finally found the one I could afford and wanted. I saw NONE that had firebrick only on the floor. Most all were just steel. (and the bricks were not removed).
My Wood Furnace has an air gap completely around the fire chamber. It has Firebricks on all sides. Even the back. But None on the Floor. That is where my fresh air comes in and also ashes fall thru the floor and go into my Ash Chamber. I pull out the ash drawer which is far below my floor grid. The top of my fire box has another protective welded panel and then two more walls. Hot air blows all around the second wall and out into duct work which is far above the furnace. I really see the need for the fire brick on the sides and back. Those coals get very hot and protect the steel walls.
I would put firebrick on all three sides just for protection, If you can. Just my opinion. Good Luck
 
Michael Young
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Mike Cantrell wrote:Yep, put firebrick on the floor. But no need for a grate. The stove should be designed so that air gets to the wood just fine.



Well I reckon I'll be picking up some fire brick tomorrow.

any idea what to use to make the bricks stick to the metal? is there some sort of high temp mortar, or will it work just fine to use some of that red high temp silicone caulk to glue them on??

Can't wait to get this sucker fired up
 
Glenn Herbert
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Why glue the bricks to the floor? Aren't they contained by the sides of the firebox and held down by gravity? Even the firebricks on the sides of the firebox can probably be held in by proper fitting instead of trying to fasten them to the steel (which will expand very differently from the brick when heated, stressing any rigid connection). You might try putting side bricks in vertically and then fitting (and cutting if necessary) the floor bricks to wedge them in place.
 
John Pollard
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Never seen them on the floor. You should always leave about an inch of ash on the floor. Firebrick on the sides not only protect the steel but make the stove run at a more constant temp and adds just a bit of thermal mass. Same fire in identical stoves, one with brick, one without and the sidewalls on the one without will be a lot hotter. Maybe dangerously so. The kind of hot that can melt or ignite things close by. All dependent on the thickness of the steel and the extremity of the fire of course.
 
Judith Browning
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Michael Young wrote:I just bought a wood stove. The woodstove has no firebrick. It's just a burn chamber and then it looks like there's an air chamber around that to trap heat. Will I get better performance out of this stove if I install fire brick to add some additional thermal mass?


I had to go look in our wood stove to be absolutely sure...no fire brick on the floor or anywhere except lining the door. If you have never used your stove before I think I would hesitate to modify it any before first trying it out. I wouldn't want our fire box any smaller...we put a big log in at night. I can only dream of a rocket mass heater and hint strongly to our sons
 
Michael Young
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Thanks for all the input Permies

I've got to do a little chipping to make this sucker fit.

Another 1-1/2" fighting with it and this woodstove is installed (Callooh! Callay!). Can't wait to get it fired up
 
Jeremiah wales
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Whats the latest Michael? How is it going with Firebrick?
 
Michael Young
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Thanks for asking Jeremy.

wood stove is installed and running good. When I get a good fire in there, I'm getting temp readings of 200. But I need to buy a more accurate thermometer because this one only goes up to 200

I sometimes have a little problem with draft. When I'm first lighting it, and sometimes when I open the front to add more wood, I'll get some smoke inside the house. I was expecting, with good draw, there would be suction to pull smoke up and out. So not sure why I'm having the problem.

The blower is position poorly. So at the end of the season I'll be taking it to a welder and having the blower port moved so I can fit a bigger blower. I found one of those old cast iron tea/coffee pot looking things at a garage sale for $5-bucks. I recycle citrus peels by dropping them into water in that cast iron kettle thing. So I get a light orange aroma which is kinda nice.
 
Jeremiah wales
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Years ago. I had a regular chimney in the house . It always worked great. Now Chimney was removed in this house. I set up my furnace going out the window area, until I get it fine tuned. I had to make several changes to get good draft in mine. Now it works too good. But I am still not happy, I use black stove pipe noninsulated. I feel that is my shortfall. But the draw is great. No More smoke back into the house.. No buildup in the stove either. After this season. I will replace some of the firebrick. Some of it is original and has cracked pretty well. But I will repair and reinstall to get it right for next season.
 
Tom Connolly
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RE: smoke, what kind of wood and kindling are you using?
 
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