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  #81  
Old 09-04-2012, 12:12 PM
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Default Re: Oven Build in SC

Does anyone have an opinion on how long you need to wait before starting to build on top of the hearth pad after it's been poured? I know I waited a week+ after the foundation slab was poured but I wasn't sure on the hearth pad.
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  #82  
Old 09-05-2012, 03:36 AM
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Default Re: Oven Build in SC

Thanks Pompeii7dc and dvm.
I'm thrilled to get this far and even more excited now that things will get interesting with starting the oven!! I don't think I could have gotten this far or had the confidence to start this project without this forum and its members. The knowledge and experience are the most important tools in the bag!!
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  #83  
Old 09-05-2012, 07:35 AM
dvm dvm is offline
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Default Re: Oven Build in SC

Quote:
Originally Posted by videts38 View Post
Does anyone have an opinion on how long you need to wait before starting to build on top of the hearth pad after it's been poured? I know I waited a week+ after the foundation slab was poured but I wasn't sure on the hearth pad.
Videts38
I would not try to drill any holes in that slab this week but you can certainly start laying down your insulation forms (for v-crete) or cutting ceramic board any time. Are you planning the walls on the floor, or the walls on the insulation?
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  #84  
Old 09-05-2012, 11:25 AM
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Default Re: Oven Build in SC

I'm planning to maintain the igloo shape and not have it enclosed. And from what I've been reading in this forum it suggests to have the floor inside the wall if your keeping the igloo shape. Maybe because of thermal expansion? I'm not quite sure of the correct reason. In that case I'm trying to figure out how to do a circular form for the v/crete portion. I was going to experiment and make a v/crete form up and see if it was possible to cut into it after it has set up because if I can do that then I would just create a square form to the size I need then trace out the circular part of the form and cut away.

Anyone have thoughts of this?
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  #85  
Old 09-05-2012, 11:43 AM
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Default Re: Oven Build in SC

You can make a circular form from pressboard (pegboard without holes) and many other thin sheet materials that are flexible. Just rip the sheet to your desired height and calculate the necessary length based on your chosen diameter of your wfo to the outside surface of the walls. So a 36" oven (internal) plus standard brick of 4.5" x 2 sides = 45" diameter Use pi x dia = circumference. in this example, 141.4" circumference. most sheets are 8' length, so rip two and overlap to get the desired circle. you can attach the two with screws facing toward the outside.

I wouldn't try to cut the vermicrete. It is very crumbly and i think you would have a mess. I would do the circle form and add a section for your entry like the FB plans show. After you have poured the vcrete, i would go back with a mortar/sand/fireclay mix and slather around the exposed edge to control the crumble. HTH

The floor inside the dome allows for separate expansion/contraction of the dome and floor. be sure and leave an 1/8" gap between the dome wall and floor.
Look at Gulf's post #66 on your thread. He has a good pic of the form for the vcrete.
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Last edited by texman; 09-05-2012 at 12:09 PM. Reason: explain
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  #86  
Old 09-06-2012, 06:54 AM
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Default Re: Oven Build in SC

Thanks Texman on your advice. I will go for the flexable masonite board (peg board minus the holes) and create a circular form for the v/crete. And I like the idea of the mortar/sand/fireclay for the edge of the v/crete layer to give a little added strength to the edge seeing how I'll probably be nicking it up a little when I’m standing all over the hearth pad area.
I traced out the ID of the oven form template last night. It feels good now to have moved on from the stand portion temporarily. Every time I asked my wife to take a look she was always saying “It doesn’t look much different than the last time I saw it.” She doesn’t notice all the little things that need to be done to get from point A to point B. Maybe the next time she tell me “It look’s like your making progress. (LOL)

Just took a look at Gulfs pic that you attached and that is exactly what I'm trying to do. That's the nice thing about this forum, anything you try to do has already be tried and tested by someone, somewhere.

Excellent, thanks for the help.

Last edited by videts38; 09-06-2012 at 06:57 AM.
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  #87  
Old 09-09-2012, 05:25 AM
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Default Re: Oven Build in SC

Insulation layer under floor question.
I'm putting 4" of vermiculite/portland mixture under the floor at a 5:1 ratio. I can't remember and can't find if you need to keep this layer wet for a few days after pouring to help it "cure" or if you just let it dry out on it's own. If anybody has some advise I would appreciate it.
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  #88  
Old 09-09-2012, 06:13 AM
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Default Re: Oven Build in SC

I would not keep it wet, if that means spaying it down with a mist each day. I would keep it covered with some plastic for about a week, though. After that you could just keep it shaded from the sun for another week or two. 28 days is the max for curing portland. I dont think it will get any stronger after that if it is kept wet. Natural aging of concrete, after 28 days of curing, will increase in strength for about 50 years. I would hope that the portland in vcrete responds the same as portland in concrete. I continued keeping my vcrete wet by shading it with firebrick after about two weeks. I will probably pay for that when I do my curing fires .
One thing that I think that you should do, if at all possible, is to keep your forms up for as long as possible. Vcrete will chip on the corners no matter how long you cure it. Building the dome and entry can take a toll the edges of vcrete.
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  #89  
Old 09-09-2012, 07:46 AM
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Default Re: Oven Build in SC

Thanks for the insight Gulf. I will keep it plastic wrapped for a week before building upon it.I planned on keeping the forms around it for as long as possible. Also Texman suggested to "slather" a mortar/sand/fireclay mixture to the edge to keep the edge from crumbling and added strength This made some good sense to me considering previous posts of the weakness of the v/crete edge.
Again, thanks for the input and advise. Onward!!!
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  #90  
Old 09-10-2012, 08:54 AM
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Default Re: Oven Build in SC

correction: i used portland/sand/fireclay to firm up the edges. Mortar would work too, i think. I told you wrong, sorry about that. I just added the fireclay to prevent heat breakdown, but if you are using FB board or something like it, the heat on the vcrete wont be a concern.
Keep up the good work.
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