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Yahoo-Archive 04-11-2005 01:22 PM

Insulating Blanket
I am posting this in both places -- here and fornobravo/forum, where
we will make it sticky.

Using a ceramic insulating blanket is a good idea, for both brick
ovens and refractory ovens, because they are efficient, don't use a
lot of space, and keep loose insulation from ever getting into your
oven. And they aren't that expensive. Would folks agree with that?
Unless budget is a serious issue, you should consider using it. (We
include a large 6#, 1" blanket as part of our refractory ovens.)

If you are looking for a place to buy a ceramic insulating blanket,
contact They are in Atlanta, and
ship UPS. Tell them to give you the price for Forno Bravo customers.

If you find a better source, or a good regional source, let us know.


Yahoo-Archive 04-11-2005 01:22 PM

Try this E-bay seller.* He is in*Portland *He has some interesting stuff*regarding refractory materials and blankets






Yahoo-Archive 04-11-2005 01:23 PM

hi james,

o.k., i am sold on using a insulating blanket, but how much
pumice/vermiculate insulation can we save that way ?(what would be the
ratio, e.g 1inch insulation blanket equals 3 inches of vermiculate as
an example???)
i really would like to have a super insulated oven, yet like to get
down in thickness..., since i also like to have as much space on the
side of the dome for putting things down while using the oven.


Yahoo-Archive 04-11-2005 01:24 PM

The rule of thumb is 1" blanket and 4" vermiculite. I had an insulation engineer run a test, and conclude that the blanket replaces 2" of loose vermiculite. We had them run a simulation where they added 1" of insulfrax, and reduced 1" of vermiculite. 1":4", 2":3", etc. over a 24 hour 1000F exposure. The outer face tested consistently dropped by adding 1" more insulfrax and 1" less vermiculite.

1" Insulfrax Blanket 6#, 4" Vermiculite 1000F** 172F

2" Insulfrax Blanket 6#, 3" Vermiculite 1000F** 161F

3" Insulfrax Blanket 6#, 2" Vermiculite 1000F** 151F

4" Insulfrax Blanket 6#, 1" Vermiculite 1000F** 142F

5" Insulfrax Blanket 6# ******* 1000F** 135F

Thinking about it, I should ask him to add 1# insulfrax, and drop 3" of vermiculite and re-run the test. I would note that after 24 hours of 1000F, (which you will not approach), the outer face is barely warm.

I agree that you want the oven well-insulated, but think that you have some wiggle room. My oven here has 1" of low-tech blanket insulation (I don't even know the name of it, but it can't be close to Insulfrax in efficiency), and 2-3" of vermiculite, and I have never felt heat in my stucco walls. This is an extreme example -- I did it intentionally to see how it would work, and I think we can take a small lesson from the experiment.

Long answer to a short question -- but some interesting background info.


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