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Does anyone have thoughts on how much heat loss is "acceptable" through the insulation board and into the hearth? I am considering a material that, according to the manufacturer's calculations, will reach about 206 degrees F on the side opposite an 1100 degree heat (assuming that heat is direct and constant). Does anyone know how FB Board compares to that? Is 1100 too high a number to use? I could have them recalculate it, but what's a realistic number (i.e., how hot does the base of the oven floor get)?
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Re: Heat loss thru insulation board
What is the material? What kind of cost range are you talking about? Is it easily obtainable?Do not meddle in the affairs of dragons, for you are crunchy and taste
like chicken...
My 44" oven in progress...
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Re: Heat loss thru insulation board
I don't think your floor will hit that temp.
I could be wrong.
But the losses you are describing seem normal and acceptable to me.Comment
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Re: Heat loss thru insulation board
The material is Insblok-19, which others here have used. The numbers I quoted were based on 2" panels. With 3", the outside will reach 171 degrees @ 1100 degrees inside.Comment
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Re: Heat loss thru insulation board
Reading other posts (which I should have done earlierOriginally posted by asudavew View Post
), it seems like 800 degrees may be more reasonable for the oven floor. At that temp, the manufacturer says the 2" board will reach 163 degrees on the outside (at 80 degrees ambient temp). That's more reasonable. Thanks for the input!
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Re: Heat loss thru insulation board
Maybe one of our thermocouple users can help in this.
In using my IR, the face temp of my hearth bricks goes off the scale (over 1050 degrees) directly under the fire, how much of that bleeds all the way through the bricks an into the insulation - I don't know. I used 4" of vermiculete as my insulation under the hearth. The highest temp I have seen through the insulation and through the support slab and 1/2" backerboard is around 125 degrees (after firing for 3-4 hrs).
RTComment
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Re: Heat loss thru insulation board
Just giving ya a heads up.Originally posted by dbhansen View PostReading other posts (which I should have done earlier ), it seems like 800 degrees may be more reasonable for the oven floor. At that temp, the manufacturer says the 2" board will reach 163 degrees on the outside (at 80 degrees ambient temp). That's more reasonable. Thanks for the input!
I think the insulation boards are the way to go, if you can afford the expense.
Take pics of your build.
We are all voyeurs here!
DaveComment
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Re: Heat loss thru insulation board
Dave, links to my pics are in my signature line. I have definitely decided to go with the boards; I just need to decide which ones and how thick!Comment
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Re: Heat loss thru insulation board
Oh!! I didn't notice the link.Originally posted by dbhansen View Post
If I had a do over.... 4 inches of board at the minimum....Comment
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Re: Heat loss thru insulation board
These would be great for insulating the hearth.
Check out the 2 lb bricks.
Bailey Ceramic Supply - Kilns & Acc. - Kiln MaterialsComment
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