#11  
Old 09-30-2008, 04:28 AM
Peasant
 
Join Date: Sep 2008
Location: Melbourne, Australia
Posts: 45
Default Re: Oven base insulation

I used 100mm thick Hebel blocks. It's aerated concrete with great insulation properties....and no mess! It can even be cut with a hand saw!!!
I paid AUD$4 per block of 600mm x 200mm x 100 mm. I used 14 blocks for a area of 1200mm x 1400mm.
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  #12  
Old 09-30-2008, 05:09 PM
Laborer
 
Join Date: May 2008
Location: Howden, Tasmania, Australia
Posts: 62
Default Re: Oven base insulation

Nice idea. Cheap and easy to handle as well. I have already laid the vermiculite witht the Cal Sil boards on top. How did you find out about the insulative properties in Heable blocks? I have seen them at hardware stores but not thought of them for insulation.
Cheers
Jase
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  #13  
Old 09-30-2008, 09:57 PM
Peasant
 
Join Date: Sep 2008
Location: Melbourne, Australia
Posts: 45
Default Re: Oven base insulation

Quote:
Originally Posted by pizzahead View Post
Nice idea. Cheap and easy to handle as well. I have already laid the vermiculite witht the Cal Sil boards on top. How did you find out about the insulative properties in Heable blocks? I have seen them at hardware stores but not thought of them for insulation.
Cheers
Jase
A few friends told me about them, and then I checked out their website:
Hebel : About Hebel

".....It has a unique combination of thermal mass and insulation...."
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  #14  
Old 12-30-2008, 03:43 PM
Serf
 
Join Date: Sep 2008
Location: Australia
Posts: 1
Default Re: Oven base insulation

Quote:
Originally Posted by james View Post
I'll agree with that. The thermal calculations show that 2" of ceramic insulating board (Cal Sil or Alu Sil) is a little better than 4" of vermiculite concrete. The 2" thickness takes a 1000ºF face down to something reasonable at equilibrium -- which works well for a home brick oven that will operate for hours at a time, rather than continuously.

If cost isn't too big of an issue, go thicker.

James
I am at the stage of biulding the dome for a 42" oven and was going to use 40mm calsil board directly on the concrete hearth - maybe i will need to add an extra 1" thick calsil layer. would this be adequate ??

Mike
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  #15  
Old 01-04-2009, 03:03 PM
Laborer
 
Join Date: May 2008
Location: Howden, Tasmania, Australia
Posts: 62
Default Re: Oven base insulation

Hi Mike. I would use more than the 40mm cal sil board. I ended up putting 75mm of vermiculite concrete underneath the 40mm board on my 42" oven and it seems to have worked very well.

Remember, once the dome is built you cannot go back and put more insulation underneath it. It is worth overdoing it now rahter than wishing you had have done it later down the track.

Good luck.
Jase
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