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Old 03-12-2013, 05:25 PM
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Default Insulation: The more the merrier. But how much more?

So im slowly getting ready to pick up rolls of Ceramic fiber insulation for my igloo style oven. I am going to install as much insulation as needed and skip V-Crete. I understand that CF blanket is more efficient than V-Crete and i just don't want to deal with V-Crete. I have a game plan for shaping the dome so im not worried about the shape. What i am concerned about is the overall bulk of the dome. I don't want to have a "fat-head" dome. So how many inches of insulation would you guys recommend i use?

Thanks for your help.
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Old 03-13-2013, 06:31 PM
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Default Re: Insulation: The more the merrier. But how much more?

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Originally Posted by V-wiz View Post
So how many inches of insulation would you guys recommend i use?
Three inches is the standard for ceramic blanket. There's a thread kicking around the board concerning diminishing returns of insulation, but I don't recall where it is.
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Old 03-13-2013, 06:40 PM
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Default Re: Insulation: The more the merrier. But how much more?

I went 3 " of blanket, then topped that with 3" of vermic-crete, what I found in research from other member and posts was that obvious heat loss is realized more at top, and more is truly better in this instance. I had no trouble with blanket compressing, actually the vermic was so light it helped shelter it and really helped dome final shape. I have a make shift metal door, not nearly tight nor is in insulated, working on that now, and given that i reach working temps of 950 plus, the next day its around 400-500, day after that still in 250 range. good luck!
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Old 03-13-2013, 09:54 PM
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Default Re: Insulation: The more the merrier. But how much more?

three to four inches of CF blanket is plenty

to irelande's post, I think that it is better to invest in a good door and a heat break than to add insulation beyond that. It is $50 a roll or something like that, after all...
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Old 03-14-2013, 12:19 AM
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Default Re: Insulation: The more the merrier. But how much more?

Thanks for the respond all. 3" is assuming that vermiculite will be used right? since im not planning on using Vcrete i should technically be using more CF insulation right? about 4-5 inches worth? Thanks again.
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Old 03-14-2013, 12:46 AM
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Default Re: Insulation: The more the merrier. But how much more?

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Originally Posted by V-wiz View Post
i should technically be using more CF insulation right?
Wrong.
CF has more insulating properties that vermiculite.
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Old 03-14-2013, 12:50 AM
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Default Re: Insulation: The more the merrier. But how much more?

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Originally Posted by brickie in oz View Post
Wrong.
CF has more insulating properties that vermiculite.
Right, im aware of that as i pointed that in my OP, but would 3 inches still be enough?
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Old 03-14-2013, 12:56 AM
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Default Re: Insulation: The more the merrier. But how much more?

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Right, im aware of that as i pointed that in my OP, but would 3 inches still be enough?

If you lived in the Arctic that would be more than enough.

Edit:
I just saw that you live in LA, 3" is way too much, how cold does it get there?
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Last edited by brickie in oz; 03-14-2013 at 12:58 AM.
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Old 03-14-2013, 08:22 AM
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Default Re: Insulation: The more the merrier. But how much more?

Coldest it would get is probably 37F
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Old 03-14-2013, 09:03 AM
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Default Re: Insulation: The more the merrier. But how much more?

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Originally Posted by V-wiz View Post
Right, im aware of that as i pointed that in my OP, but would 3 inches still be enough?
I agree with brickie. That's enough by itself w/o any vermiculite.
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