#1  
Old 05-22-2013, 12:43 PM
Serf
 
Join Date: May 2013
Location: Dayton, Oregon
Posts: 5
Default New Guy needs help

Greetings all,

I am building a 42" Pompeii. I poured the insulating layer of concrete. I followed the instructions mixing 5 to 1 vermiculite to Portland cement. Thoroughly mixed it dry, mixed it wet and poured. I screed it off. It has been poured for 4 days now. It set up well and is very firm BUT the surface has some give if I press my finger on it. Is that normal or have I done this wrong?

Advice please! Thanks in advance.
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  #2  
Old 06-03-2013, 07:01 PM
Reg Reg is offline
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Join Date: Apr 2013
Location: Texas
Posts: 1
Default Re: New Guy needs help

BigC,

This is Reg, I just poured my insulating layer of concrete today and I'm experiencing the same level of uncertainty: that layer gives a little when pressed with finger. What did you finally discover after after your pour?
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  #3  
Old 06-04-2013, 11:27 AM
Serf
 
Join Date: May 2013
Location: Dayton, Oregon
Posts: 5
Default Re: New Guy needs help

Hi Reg,

I found out the the finished insulation layer should feel a bit like a cork. It give a bit when you press on it. It's edges also flake of and the top is easily gouged or marked. I used the mud (sand and fire clay) to even out the marks and lay a level floor. It has high compression strength. It's wired but it sounds like you are doing it right.
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  #4  
Old 06-04-2013, 11:33 AM
Serf
 
Join Date: May 2013
Location: Dayton, Oregon
Posts: 5
Default Re: New Guy needs help

Here is a picture of the oven floor and first course.
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New Guy needs help-image.jpg  
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  #5  
Old 06-04-2013, 11:34 AM
Serf
 
Join Date: May 2013
Location: Dayton, Oregon
Posts: 5
Default Re: New Guy needs help

Here is the just poured insulation layer
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New Guy needs help-image.jpg  

Last edited by TheBigC; 06-04-2013 at 11:38 AM.
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  #6  
Old 06-04-2013, 11:37 AM
Serf
 
Join Date: May 2013
Location: Dayton, Oregon
Posts: 5
Default Re: New Guy needs help

Here is a close up of the dried insulation layer.
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New Guy needs help-image.jpg  
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