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Old 04-23-2013, 07:33 AM
Join Date: Apr 2012
Location: Washington, DC
Posts: 200
Default Re: Insulation

Originally Posted by UtahBeehiver View Post
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.
Actually, 2 pi times the radius squared is surface area of a half sphere (another useful quantity for ovens), not volume. Volume is 2/3 pi times radius cubed, or in your case 17x17x17x0.66xpi = ~10300 cubic inches, about 6 cubic feet. Even if your enclosure goes up 48 inches, filling the whole box would be overkill--getting up to a height of 24" would give you a 7" layer. So you want 4x4x2 - 6 = 26 cubic feet, or 7 bags.

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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Old 04-23-2013, 09:35 AM
Join Date: Mar 2013
Location: New Hampshire
Posts: 51
Default Re: Insulation

Thanks guys-really appreciate the info. Looks like I will be going with the loose vermiculite due to availability, price, shipping, and not having to monkey screw with blanket. Hoping to have my project completed before Memorial Day weekend.
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Old 04-23-2013, 11:52 AM
UtahBeehiver's Avatar
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Join Date: May 2012
Location: Salt Lake City, Utah
Posts: 1,552
Default Re: Insulation

I did make an error, you are right, this was the formula I was using to determine the square inch surface area of my dome for calculating the amount of blanket coverage. So we all get a brain cramp once in while......
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Old 04-23-2013, 01:30 PM
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Join Date: Mar 2007
Location: Townsville, Nth Queensland,Australia
Posts: 5,163
Default 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; 04-23-2013 at 01:35 PM.
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