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  #91  
Old 09-10-2012, 10:21 AM
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Join Date: Apr 2012
Location: South Carolina
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Default Re: Oven Build in SC

Understood texman, actually that's what I thought meant, but thanks for clarifying.
Made a little more progress over the weekend. I cut the insulating firebrick. and started the form for the v/crete. My plan is for 4" v/crete topped with the insulating firebrick. The plan is to place the IFB on the wet v/crete to get a little bond so they are a little stable. then a little slather of the portland/sand/fireclay on the edges to keep things from getting nicked up during the build. I also found the center of the hearth to start figuring out placement.
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  #92  
Old 09-11-2012, 10:44 AM
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Location: Amarillo, Texas
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Default Re: Oven Build in SC

Nice setup, looking good.
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  #93  
Old 09-11-2012, 11:07 AM
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Join Date: May 2012
Location: Salt Lake City, Utah
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Default Re: Oven Build in SC

v,

I used FoamGlass and CaSi for my hearth insulation and during the build I figured out that I could reduced the damage to the FoamGlas and CaSi from my feet by using the excess home brew as I was doing the courses. You will have extra mortar........ just slather on the excess and it helps with minimizing damage by your toes. Nice start by the way.
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  #94  
Old 09-11-2012, 07:01 PM
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Join Date: Apr 2012
Location: South Carolina
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Default Vermiculte layer??, Oven Build in SC

Thanks for the advise and compliments all. It is exciting getting to the oven and all!

I finished the forms for the insulating layer/insulating firebricks and am ready to stat mixing the v/vcrete layer, I thought!
I was checking the vermiculite tonight and opened a bag to find the finer vermiculite- not the coarse.
My question is, is this the stuff needed(Sawdust size) vermiculite or do I need to find the coarse stuff. When I bought it and I saw the size of the bag(very large) I pulled an "assume" then I talked to the guy selling it at a Feed and Seed and he said it was the coarse stuff. I've never seen the stuff before so maybe this is the coarse stuff? Again, it's like sawdust maybe a little bigger.
Next, is this stuff tamped down in the forms or just screeded, or would tamping defeat the insulating purpose of this layer by compacting it?


I have pics of the forms but forgot my card reader at work, pics tomorrow.
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  #95  
Old 09-11-2012, 07:31 PM
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Location: Townsville, Nth Queensland,Australia
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Default Re: Oven Build in SC

I tamp it down a little. By doing this it will increase its strength, you don't want it to fall apart. You need to add more water to the finer stuff than the coarse stuff, but I think you get a more consistent mix with the fine.
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  #96  
Old 09-12-2012, 07:06 AM
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Default Re: Oven Build in SC

thanks David for the info on the fine vermiculite. Hopefully it has the same insulating properties as the coarser stuff.
Here is the form for the v/crete and insulating firebrick layer. Weather permitting, I should be mixing it tonight!
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  #97  
Old 09-13-2012, 05:08 AM
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Join Date: Apr 2012
Location: South Carolina
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Default Re: Oven Build in SC

Morning All,

Got the insulating layer mixed poured and topped with insulating firebrick last night. I was little nervous of the mixture and all. After reading many posts of the amount of water needed I was careful not to have excess water. I mixed till I had a wet sand consistency, no water in the bottom of the wheel barrel and if I grabbed a palm full, only when I squeezed extremely tight did I see moisture. hopefully I did this right. After topping with the insulating firebrick I found out my leveling of the vcrete was not perfect. I have less than an 1/8" divot in toward the center. Hopefully this won't be too big of a concern, from what I've read on FB forum, I plan on leveling again with a fireclay under the firebrick floor.

Can I get some opinions on what exactly goes down under the firebrick floor; is it straight fireclay or a fireclay mixture that should be put down to level the floor?
Also, I haven't read about a wait time for when I can start building the floor/dome on top of the vcrete insulating layer; does anybody have thoughts about this?
I appreciate any opinions on the process so far.
Oh yeah in the last pic you can see the building inspector stopped by and gave me an "attaboy". Felt good!
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  #98  
Old 09-13-2012, 05:43 AM
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Default Re: Oven Build in SC

There is discussion on this topic on the thread "vermiculite insulation" under Pompeii oven construction.
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  #99  
Old 09-13-2012, 07:06 AM
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Default Re: Oven Build in SC

Looks very nice, nice form work. I used a half and half mix of fire clay and sand slurry using a 1/4" notched trowel to level my fire brick floor/insulation. Some people use a dry mix of the same proportions. Vcrete/insulating fire brick too, great job.
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  #100  
Old 09-13-2012, 07:19 AM
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Join Date: Apr 2012
Location: South Carolina
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Default Re: Oven Build in SC

Thanks Russell, I'm pretty happy the way it turned out.
As far as the forms, I have Texman and Gulf to thank for that. Texman led me to Gulf's build and it was pretty much what I want to do and it was nice to see it before I attemped it. Not having a clue or prior experience on this type of work. I tend to kringe everytime I attemp to do something and hope for the best....so far so good. And now it should get more interesting for me now that I have moved on to the dome!!!!
I have to say though this is a fun and interesting and wild project to do.
As long as my pizzas don't come out with bricks on them I should be fine!!!
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