#1  
Old 06-29-2011, 11:01 AM
Peasant
 
Join Date: Jun 2011
Location: NE-PA
Posts: 35
Default Insulating slab premix?

Hi all, I have some premix left over (4-5 bags) from my reinforced slab pour, before I begin on my insulating slab, I was wondering if I could use the premix and perlite/vermiculite to create the slab, or will the sand and stone take away from the insulation properties.
thanks
Forgeblast
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  #2  
Old 06-29-2011, 07:40 PM
Apprentice
 
Join Date: Jan 2011
Location: Perth, Wesern Australia
Posts: 178
Default Re: Insulating slab premix?

Forge,

You are correct in your assumption that is will reduce the efficiency of the insulation.

All you want in the vermiculite (5 parts) and pure cement/concrete (never knew the right term).. in 1 part.

one little tip if i may,

presoak the vermiculite in water.. this will make your life a whole lot easier.
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  #3  
Old 06-29-2011, 07:44 PM
mrchipster's Avatar
Il Pizzaiolo
 
Join Date: Apr 2010
Location: Minneapolis, MN USA
Posts: 1,261
Default Re: Insulating slab premix?

Pure Portland Cement is the correct term,

Concrete is the mixture of Portland Cement/sand/and rock - sometimes a little lime is added.
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Old 06-29-2011, 07:53 PM
Apprentice
 
Join Date: Jan 2011
Location: Perth, Wesern Australia
Posts: 178
Default Re: Insulating slab premix?

Thanks Mrchipster for clarifying.. I always get them the wrong way around.
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  #5  
Old 06-29-2011, 09:29 PM
Peasant
 
Join Date: Jun 2011
Location: NE-PA
Posts: 35
Default Re: Insulating slab premix?

Appreciate the fast replys, Ill pick up a bag of portland.
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  #6  
Old 06-30-2011, 02:21 PM
Peasant
 
Join Date: Jun 2011
Location: NE-PA
Posts: 35
Default Re: Insulating slab premix?

I was able to mix and pour it today. I wet the perlite first, and then dumped it into my mortar tub, added the portland and mixed well, then added some more water and mixed again. I then put it into the form and check for level. It was actually real easy to do, no stress and adding the water to the perlite first helped the portland coat it better.
Thanks all for the help.
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  #7  
Old 06-30-2011, 07:32 PM
Apprentice
 
Join Date: Jan 2011
Location: Perth, Wesern Australia
Posts: 178
Default Re: Insulating slab premix?

Glad to hear it all worked out ok.. wetting defintately makes a world of difference.

I dry mixed it on a cement mixer.. man was that a bad idea.. All that happens is the vermiclite/perlite sucks the water from the cement and turns it rock hard..

pics?
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  #8  
Old 06-30-2011, 08:05 PM
Peasant
 
Join Date: Jun 2011
Location: NE-PA
Posts: 35
Default Re: Insulating slab premix?

Ill post some as soon as I pull the forms. I got a mouth full of dust when I was pouring out a bag, the water seemed to keep the dust down nicely.
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