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  #11  
Old 11-16-2012, 01:54 AM
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Default Re: making fire hearth on mobile oven

I meant vermaculite, I'm not familiar with vesuveus. Are you using the steel plate as a reservoir for heat or for structural stability? If you are not using it for heat, I would place the ceramic blanket on top of it to minimize the heat transfer.
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  #12  
Old 11-16-2012, 12:08 PM
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Default Re: making fire hearth on mobile oven

With 100mm of dense refractory castable sitting on top of ceramic fibre blanket it is likely to just compress it, your 100mm of vermicrete should be sufficient insulation on its own. Use a 5:1 vermiculite, cement ratio and let it dry for about 3 weeks before building over it.
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  #13  
Old 11-16-2012, 12:58 PM
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Default Re: making fire hearth on mobile oven

Wouldn't you say "A ton of Bricks", also compresses the ceramic boards, upon which its sit? Isn't the (maxim) here is: Insulate, insulate, and insulate????
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  #14  
Old 11-16-2012, 01:48 PM
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Default Re: making fire hearth on mobile oven

Yes, board might be ok but blanket is too soft. 100 mm vermicrete is sufficient. He's also using castable, not bricks
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  #15  
Old 11-16-2012, 03:58 PM
Peasant
 
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Default Re: making fire hearth on mobile oven

thanks for the healthy debate
I will get some fibre board to go on top of vermaculite before i cast hearth then,
do I really have to wait 3 weeks for vermaculite to dry before I cast floor,because then I will have to wait another 3 for hearth to dry,I want to use it in 4 weeks.
dome has been drying now for 3 weeks.
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  #16  
Old 11-16-2012, 04:07 PM
Peasant
 
Join Date: Oct 2012
Location: new zealand
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Default Re: making fire hearth on mobile oven

people have written vermaculite, cement ratios ranging from 12 to 1 to 5 to 1.
so I went 7 to 1, but will go 5 to 1 for outside dome( I think)
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  #17  
Old 11-16-2012, 04:18 PM
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Default Re: making fire hearth on mobile oven

You don't have to wait three weeks for the under floor vermicrete to dry but it will take longer to dry once it's built over. The underfloor vermicrete should be 5:1 for adequate strength. The vermicrete over thedome should've about 10:1 for adequate insulation.
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  #18  
Old 11-16-2012, 10:53 PM
Peasant
 
Join Date: Oct 2012
Location: new zealand
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Default Re: making fire hearth on mobile oven

thanks david
sigh of relief...
the vermaculite is 7 to 1 on base but i packed it down pretty hard,and it feels solid, plus up against strong walls,I really dont want to take it apart and start over Ha ha which i did with the dome.you may remember my first dome had lime, small river pebbles, sand and refrack concrete, well a friend is using it and it hasnt exploded yet,but glad I made another anyway.
there are so many variables and things to learn with this thing
cheers
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  #19  
Old 11-16-2012, 11:04 PM
Peasant
 
Join Date: Oct 2012
Location: new zealand
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Default Re: making fire hearth on mobile oven

but I can still fire it up for operation 3 weeks after hearth goes down tomorrow?
will do a small fire first, then bigger one next day ,build it up before cook up
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  #20  
Old 11-17-2012, 01:52 PM
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Default Re: making fire hearth on mobile oven

Read the thread on oven curing. If it were mine I'd be doing some lower temp cooking (roasting and baking) for a couple of weeks before attempting pizza temperatures.
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