#1  
Old 07-23-2009, 04:42 PM
Apprentice
 
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Location: saugerties, ny
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Default vermiculite/cement 5:1 question

Sorry if this one is old. I can't find it.
I keep reading about mixing vermiculite or perlite with cement at 5:1. What are we measuring? 5 what to 1 what?
Thanks
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  #2  
Old 07-23-2009, 05:24 PM
Neil2's Avatar
Il Pizzaiolo
 
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Default Re: vermiculite/cement 5:1 question

By volume.

For example, five shovel fulls of perlite and one shovel full of cement.

And just enough water to make it "workable".
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Old 07-23-2009, 05:26 PM
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Default Re: vermiculite/cement 5:1 question

mixing of materials is always assumed by volume unless otherwise specified, such as by weight
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Old 07-27-2009, 03:50 AM
Apprentice
 
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Default Re: vermiculite/cement 5:1 question

so for example if I know it took so many bags of cement to make my structure slab, I can just sort of estimate how many bags it takes to make a slab of a certain size and apply that to the verm/cement mixture? So if I want to replicate the area of the slab, all I have to do is replace some of the cement with the vermiculite for the same total?
Thanks
Kim
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Old 07-27-2009, 09:34 AM
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Default Re: vermiculite/cement 5:1 question

For all practical purposes the volume of the vermiculite (say, a four cubic foot bag) will be the volume of your vermiculite concrete. The portland doesn't take up that much room.
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  #6  
Old 07-27-2009, 10:04 AM
Apprentice
 
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Default Re: vermiculite/cement 5:1 question

Thanks. Very helpful. How did we ever get by before the Internet?
Kim
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  #7  
Old 07-28-2009, 01:55 PM
Apprentice
 
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Default Re: vermiculite/cement 5:1 question

Before the internet I think we ordered out for pizza.

I poured my insulating layer last Friday and found for the 36 inch oven it took all of 3 four cu. ft. bags of Perlite to fill my forms to the 4 inch level.
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  #8  
Old 07-28-2009, 06:11 PM
Apprentice
 
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Default Re: vermiculite/cement 5:1 question

I'm finding it won't take much too. Maybe four or five - tops. And I think $8.75/ 4c.f. bag is probably reasonable.
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