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TheBigC 05-22-2013 01:43 PM

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.

Reg 06-03-2013 08:01 PM

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?

TheBigC 06-04-2013 12:27 PM

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.

TheBigC 06-04-2013 12:33 PM

Re: New Guy needs help
 
1 Attachment(s)
Here is a picture of the oven floor and first course.

TheBigC 06-04-2013 12:34 PM

Re: New Guy needs help
 
1 Attachment(s)
Here is the just poured insulation layer

TheBigC 06-04-2013 12:37 PM

Re: New Guy needs help
 
1 Attachment(s)
Here is a close up of the dried insulation layer.


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