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Old 08-31-2012, 09:16 PM
Apprentice
 
Join Date: Jun 2009
Location: Westchester
Posts: 126
Default 6" insulation under dome?

I wanted at least 4" of cal sil under the dome, and got two boxes in 1.5" thick boards. Any reason to go over 4.5"? I have enough boards for 6", but I'm concerned about settling under the dome with that much (I think Lee encountered that) and suspect there's a law of diminishing returns after 4.5" of insulation under the dome. Any point to 6"?
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Old 09-01-2012, 08:36 PM
Laborer
 
Join Date: Sep 2009
Location: Harrisonburg, Virginia
Posts: 62
Default Re: 6" insulation under dome?

I am about to close my dome and have four inches of cal sil under my floor. It seems like a lot but I wanted to make it as well insulated as I could. Plus I got the skamol board fairly cheap and sorta close to my home.

I don't think you would have settling or any compression of the board. It is pretty strong stuff compression wise. I am not sure if you would need more than four and a half inches. I am using my left over board to make an insulated door or two.

Good luck with the build.

David
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Old 09-01-2012, 09:23 PM
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Join Date: Apr 2010
Location: Minneapolis, MN USA
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Default Re: 6" insulation under dome?

Quote:
Originally Posted by jimkramer View Post
I wanted at least 4" of cal sil under the dome, and got two boxes in 1.5" thick boards. Any reason to go over 4.5"? I have enough boards for 6", but I'm concerned about settling under the dome with that much (I think Lee encountered that) and suspect there's a law of diminishing returns after 4.5" of insulation under the dome. Any point to 6"?
I have 2.5 vermicrete and 2 FB board and I still see a small rise in temp through the floor after a long burn, We had an afternoon neighborhood party where I kept the oven at over 800 for 5-6 hours, the wood storage bin ceiling got to about 130 at hour 5 with an ambient temp of 80 so there is some heat being lost via the floor. I did not take regular measurements.. I guess I could have added more vermicrete....

Chip
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