Question regarding pouring loose vermiculite into enclosure. I can get a bag of vermiculite that is 4 cubic foot. If my enclosure is 4 feet wide by 4 feet long and 4 feet high, I should only need one bag, is this correct? What are the recomendations for using loose vermiculite in an enclosure? I can not get the ceramic blanket locally and do not wish to pay the high price of shipping. Your guidance is appreciated.
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Re: Insulation
Originally posted by benny8 View PostQuestion regarding pouring loose vermiculite into enclosure. I can get a bag of vermiculite that is 4 cubic foot. If my enclosure is 4 feet wide by 4 feet long and 4 feet high, I should only need one bag, is this correct? What are the recomendations for using loose vermiculite in an enclosure? I can not get the ceramic blanket locally and do not wish to pay the high price of shipping. Your guidance is appreciated.Check out my pictures here:
http://www.fornobravo.com/forum/f8/lesbuild4207.html
If at first you don't succeed... Skydiving isn't for you.

Re: Insulation
Les is correct on a pure volume of a cube, if you factor out the space of your oven it will be less volume than a pure cube. The volume of a 1/2 sphere is 2 times pi times radius squared. So if you use the cube volume and subtract the 1/2 of a sphere volume and add a fudge amount there you go.
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Re: Insulation
Originally posted by UtahBeehiver View PostLes is correct on a pure volume of a cube, if you factor out the space of your oven it will be less volume than a pure cube. The volume of a 1/2 sphere is 2 times pi times radius squared. So if you use the cube volume and subtract the 1/2 of a sphere volume and add a fudge amount there you go.Check out my pictures here:
http://www.fornobravo.com/forum/f8/lesbuild4207.html
If at first you don't succeed... Skydiving isn't for you.
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Re: Insulation
Originally posted by Les View Post4x4x4 is 64 cubic ft. You need 16 bags...
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Re: Insulation
That's okay, we all get brain cramps once in a while.
BTW R value for loose fill vermiculite is about 2.0 per inch thickness vs CF super wool being about 7.0 so take it for what it is worth. So if your oven dome gets near your enclosure you may want to look at these areas closely.
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Re: Insulation
Originally posted by benny8 View PostOh my godI just read what I wrote earlier today. DUH!!!!!!! It has definitely been a MONDAY. Wow, do I feel stupid. Ok, I'm good now. If I want to insulate with loose vermiculite, will this be sufficient if I fill the enclosure? Thanks for the replies guys.Check out my pictures here:
http://www.fornobravo.com/forum/f8/lesbuild4207.html
If at first you don't succeed... Skydiving isn't for you.
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Re: Insulation
Originally posted by Les View PostBenny  how big is your oven? I went with the blanket but I would think you want at least 4 inches of loose vermiculite on the sides. You should be very well insulated on the top.
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Re: Insulation
That's going to give you 7 inches of insulation on the sides  no need for the blanket. The vermiculite will be less expensive and a whole lot easier to work with.Check out my pictures here:
http://www.fornobravo.com/forum/f8/lesbuild4207.html
If at first you don't succeed... Skydiving isn't for you.
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Re: Insulation
Originally posted by UtahBeehiver View PostLes is correct on a pure volume of a cube, if you factor out the space of your oven it will be less volume than a pure cube. The volume of a 1/2 sphere is 2 times pi times radius squared. So if you use the cube volume and subtract the 1/2 of a sphere volume and add a fudge amount there you go.
If you do the surface area calculation, it appears that your dome will be roughly 12.5 square feet, and in principle one roll of blanket will stretch to a 4" layer.
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Re: Insulation
Sphere volume is 4/3 phi rxrxr. Halve that for a hemisphere and deduct it from the enclosure volume (length x height x depth)
You can fill the corners with something cheaper like free fibreglass off cuts because you don't need the insulation so thick in the corners anyway.Last edited by david s; 04232013, 01:35 PM.Kindled with zeal and fired with passion.
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