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  #31  
Old 08-19-2013, 01:12 PM
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Default Re: Building my 1st oven on Tickfaw River in La.

Appears that he has 4-5 inches of vermicrete under the oven, no? Am I misinterpreting? Seems like that should be sufficient.

I would be more concerned about the potential for that base to absorb water in those torrential LA rainstorms, as I think other builders have experienced this when they recessed their insulation. But I guess that depends on how it is covered/sealed.
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  #32  
Old 08-19-2013, 01:19 PM
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Default Re: Building my 1st oven on Tickfaw River in La.

Quote:
Originally Posted by deejayoh View Post
Appears that he has 4-5 inches of vermicrete under the oven, no? Am I misinterpreting? Seems like that should be sufficient.

I would be more concerned about the potential for that base to absorb water in those torrential LA rainstorms, as I think other builders have experienced this when they recessed their insulation. But I guess that depends on how it is covered/sealed.
Correct, i have 4-5" of vermicrete underneath the floor
The insulation will be totally encased.
I found this image on the site and my outer shape will be similar to this.
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Building my 1st oven on Tickfaw River in La.-image.jpg  

Last edited by Crawfish fest; 08-19-2013 at 01:22 PM.
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  #33  
Old 08-19-2013, 01:20 PM
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Default Re: Building my 1st oven on Tickfaw River in La.

Hi DJ,

It's under the slab as per the Scott's design, not under the hearth and wall. So in essence he has a heat sink. That design works fine for someone that use the oven day in day out and it consume a great deal of fuel, but for casual users like most of us, it takes forever to heat up and maintain temperature. So, placement of the insulation is vital.
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  #34  
Old 08-19-2013, 01:22 PM
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Default Re: Building my 1st oven on Tickfaw River in La.

"A lental of 3" angle iron will be used as a suport over the door opening."

Because of its much higher thermal conductivity, it is wise to leave a 5 mm gap on each end of the angle iron to allow it to expand without creating stress on your brickwork. The steel gets hotter way quicker than the bricks.
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  #35  
Old 08-19-2013, 01:25 PM
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Default Re: Building my 1st oven on Tickfaw River in La.

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Hi DJ,

It's under the slab as per the Scott's design, not under the hearth and wall. So in essence he has a heat sink. That design works fine for someone that use the oven day in day out and it consume a great deal of fuel, but for casual users like most of us, it takes forever to heat up and maintain temperature. So, placement of the insulation is vital.
We changed our design somewhat, after reading so much here on the board.
The insulation is on top of the slab.
I do appreciate your thoughts
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  #36  
Old 08-19-2013, 01:26 PM
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Default Re: Building my 1st oven on Tickfaw River in La.

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Originally Posted by david s View Post
"A lental of 3" angle iron will be used as a suport over the door opening."

Because of its much higher thermal conductivity, it is wise to leave a 5 mm gap on each end of the angle iron to allow it to expand without creating stress on your brickwork. The steel gets hotter way quicker than the bricks.
Good tip, thanks!!!!!
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  #37  
Old 08-19-2013, 01:29 PM
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Default Re: Building my 1st oven on Tickfaw River in La.

ah. Perhaps I have misunderstood. If the way it is built (from bottom to top) is vermicrete --> Concrete --> Firebrick then I totally agree - Laurentius' advice is spot on. Should be Concrete --> Vermicrete (or CF Board) --> Firebrick - which is what I thought you'd done.


Cover looks good. I've experienced some of your rain showers down there, and Seattle has nothing on you. We get mere sprinkles.
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  #38  
Old 08-19-2013, 01:31 PM
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Default Re: Building my 1st oven on Tickfaw River in La.

Quote:
Originally Posted by deejayoh View Post
ah. Perhaps I have misunderstood. If the way it is built (from bottom to top) is vermicrete --> Concrete --> Firebrick then I totally agree - Laurentius' advice is spot on. Should be Concrete --> Vermicrete (or CF Board) --> Firebrick - which is what I thought you'd done.


Cover looks good. I've experienced some of your rain showers down there, and Seattle has nothing on you. We get mere sprinkles.
No, concrete is on bottom
I think we are all on the same page now.
We were very careful not to make the base into a heat sink.
M
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  #39  
Old 08-19-2013, 01:34 PM
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Default Re: Building my 1st oven on Tickfaw River in La.

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Originally Posted by Crawfish fest View Post
No, concrete is on bottom
I think we are all on the same page now.
We were very careful not to make the base into a heat sink.
M
Cool. Probably feels like a nanny-state with all the comments - but there have been quite a few builders with finished ovens who come here complaining that they can't get them hot, and it turns out they haven't used any insulation. Not much you can do that that point except for start over.
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  #40  
Old 08-19-2013, 01:43 PM
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Default Re: Building my 1st oven on Tickfaw River in La.

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Originally Posted by deejayoh View Post
Cool. Probably feels like a nanny-state with all the comments - but there have been quite a few builders with finished ovens who come here complaining that they can't get them hot, and it turns out they haven't used any insulation. Not much you can do that that point except for start over.
I appreciate people who have dome this before looking over my shoulder.
I have read thru many threads on here to learn more. Of what to do and not to do. I do not mind learning from others.
This is going to be my last oven, i want it done right the 1st time.
I can't stand the idea of a do-over.
If nothing else, i have the fb mantra, insulate, insulate, insulate.
I am hoping to post more pics next sunday.
Thanks
Michael

Last edited by Crawfish fest; 08-19-2013 at 01:47 PM.
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