#11  
Old 11-16-2010, 08:01 PM
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Default Re: Newbie Mistake, Will I be Ok?

I found the picture:


I think that I would dig it out. I would not use that fiberglass insulation, it will probably compress and lose it's value. You will be happy in the end for fixing this up front....
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  #12  
Old 11-17-2010, 05:43 AM
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Default Re: Newbie Mistake, Will I be Ok?

Wow! What a great start!! So, you've got 3" of vermicrete?—and you're going to add more of "something" to bring your hearth height up to the desired level? I may not be understanding exactly what you're trying to accomplish.

I wouldn't tear out anything. Sure, you could rip out and add more insulation, but in the overall scheme of things I don't think you'll see much difference in the actual performance of the oven. OK, your thermal loss through the bottom may be a little higher than "Joe's next door," but if your primary use for the oven will be to cook pizza that should not really be an issue.

From the surface of my hearth to the bottom I've got 15 inches of brick, concrete, vermicrete, and more concrete—and after a few hours of firing I still have 130 temps through all that—but the hearth remains 425 for 48 hours after the fire is removed.

I'd just continue to build on top of what you've got. If you need to add more "something" to get additional height for the finished hearth, since you've already got your insulation layer add more concrete, or turn the hearth bricks on their side instead of laying them flat. You can always just continue with more vermicrete on top of what you already have. You'll be adding a little more mass to the hearth than you had intended, but hey, put a fire in there and it will get hot just like the guy next door. I just hate ripping stuff out - especially concrete. Go with it - it'll work just fine. It may take the hearth 30 minutes longer to come up to baking temps, but with the additional mass you can bake more pizza - mmmmm good.

If you decide to add more vermicrete you might go with a lower density mix - say 10:1. I used 9:1 and wish I had gone to the 10:1 (or even a bit higher). It will be softer, but after curing for a couple of days still stiff enough to support the hearth bricks and provide better insulation.

Last edited by lwalper; 11-17-2010 at 07:09 AM.
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  #13  
Old 11-17-2010, 06:37 PM
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Join Date: Oct 2010
Location: Alabama
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Default Re: Newbie Mistake, Will I be Ok?

lwalper, man, 15 inches and still gets 130F to the other side. Well I did take out the brick today and (get this) the place I went give me the ceramic board! 12 sqare feet 2 1/2 inches thick so the problem is taken care of.
I did buy my ceramic blanket (50 sq.ft.) as well and he even gave me 25 pounds of ceramic fire clay.
I don't know if I should post this in another section but this supply house also had high duty fire bricks that were 9 pounds each. I told him that the brick would take to long to heat. Is this right? If they would work he only wanted 2 dollars each. He also had some white honey comb brick that were light weight and tappered that had a 2300F duty temp. I think they hold heat in and not take in heat but they to were only 2 dollars each as well. Should I stick with light fire bricks or try out the high duty bricks? Thanks for all of the help so far.
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  #14  
Old 11-17-2010, 06:58 PM
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Default Re: Newbie Mistake, Will I be Ok?

Read this before you buy bricks: Brick Oven Design | Choose the Right Brick Oven Brick
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  #15  
Old 11-17-2010, 07:19 PM
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Default Re: Newbie Mistake, Will I be Ok?

I agree that it is a pain to pull out and more of a pain to mix perlcrete again. But the hearth of the pompeii is already twice as thick as some of the ovens they sell at Fornobravo, and this would add 50% more thickness. It would also be difficult to remedy the problem after the dome was built (if it turned out to be a problem at all)...

If you want extra mass in the oven, I think it is better to add it to the dome. I added an inch of mass to my dome, and I have killed myself trying to use it all the heat in the oven after a long pizza burn...

http://www.fornobravo.com/forum/f11/...read-5456.html (32 lbs of bread)
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Old 11-17-2010, 07:26 PM
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Default Re: Newbie Mistake, Will I be Ok?

Lol we cross posted...great news about the board! Careful cutting it (wear a mask). How much do the low duty firebricks weigh? That is usually what you want...
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