#11  
Old 07-17-2010, 04:01 AM
david s's Avatar
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Join Date: Mar 2007
Location: Townsville, Nth Queensland,Australia
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Default Re: vermiculite

Dolf,
your observation about entrances is also correct
In fact most ovens have no insulation between the inner parts and the outer arch which by conduction must also be a good path for heat loss and resulting temp differential and potential for crack development. sorry this is one of my little theories/innovations that I believe can improve the efficiency of our ovens. A small break to prevent conduction to the outer arch with vermicrete also provides some cushioning to prevent outward expansion pressure on the outer arch.
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  #12  
Old 07-17-2010, 05:29 AM
Apprentice
 
Join Date: Jan 2010
Location: South Africa
Posts: 107
Default Re: vermiculite

Relief!! :-)

Thanks Dave
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  #13  
Old 07-17-2010, 05:53 AM
Apprentice
 
Join Date: Jan 2010
Location: South Africa
Posts: 107
Default Re: vermiculite

Dave
Not sure if you saw my other posts. In
http://www.fornobravo.com/forum/f8/r...ney-13335.html (Raised/insulated chimney)
Here, I checked my logic with you guys and then the pics on my execution/progress on the plan is at
http://www.fornobravo.com/forum/21/d...n-12810-2.html (Dolf's Bushveld Oven)

In essence I gathered from (amongst others your own :-)) postings that the insulation is an issue and am now inserting insulating bricks to do the trick, while pillars and lintels then carry the chimney.
Perhaps the mix between what I gain here will further compensate for what I lose at the bottom :-)
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  #14  
Old 07-17-2010, 03:00 PM
david s's Avatar
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Default Re: vermiculite

Excellent plan. You will be amazed at how much heat is captured by this thing.
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  #15  
Old 07-17-2010, 10:57 PM
Apprentice
 
Join Date: Jan 2010
Location: South Africa
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Default Re: vermiculite

Glad you think so - the plan may be mine, but it was through folks like yourself that I became aware of the need and could still do something about it. I guess (will check :-)) that most folks here builds only for themselves & thus needs to do it right first/only time round :-)
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