#1  
Old 09-21-2012, 08:55 AM
Serf
 
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Default Perlite Ratio

Hello everyone

What is the ratio of perlite, cement, and sand to build a pizza oven dome?
What is the thickness required to build the dome before the layer insulation?



Thanks
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  #2  
Old 09-21-2012, 04:10 PM
david s's Avatar
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Default Re: Perlite Ratio

Quote:
Originally Posted by Shay View Post
Hello everyone

What is the ratio of perlite, cement, and sand to build a pizza oven dome?
What is the thickness required to build the dome before the layer insulation?



Thanks
If you build the dome with perlite in the mix it will not be dense enough to store heat.
Generally the dome thickness is between 2-4" thick depending on the materials used.
Suggest you download the free plans or read lots of build threads to get a better idea of design principles.
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  #3  
Old 09-22-2012, 05:30 AM
Serf
 
Join Date: Sep 2012
Location: israel
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Default Re: Perlite Ratio

Thanks

I have just design and built the first arc already (attached a picture)
Now I have to build the rest of the oven and I wanted to build from perlite and cement
But I do not know about the right ratio
Attached Thumbnails
Perlite Ratio-cid_d19a2cef-3b8c-4577-b93b-57668701d048.jpg  

Last edited by Shay; 09-22-2012 at 05:34 AM.
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  #4  
Old 09-22-2012, 05:46 AM
brickie in oz's Avatar
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Default Re: Perlite Ratio

Like David said, you cant build an oven out of perlite and cement, it just wont work.
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  #5  
Old 09-22-2012, 06:10 AM
Serf
 
Join Date: Sep 2012
Location: israel
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Default Re: Perlite Ratio

if so what are my options instead if I do not want to
build from bricks?
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  #6  
Old 09-22-2012, 01:24 PM
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Default Re: Perlite Ratio

Use a dense castable refractory. Search the forum for this material and read all you can. You can buy the stuff from a refractory supplier.
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  #7  
Old 09-26-2012, 10:20 PM
Journeyman
 
Join Date: Jun 2008
Location: Melbourne Australia
Posts: 399
Default Re: Perlite Ratio

Perlite and its neighbour Vermiculite are insulators, and wont hold heat. As David S mentioned use a Refractory dense castable, a 1350c grade is most likely the easiest and cheapest option. approx $25-$30/25 kg bag.Dont know the size of your oven, but if you calculate the volume of the prefered dome, you can use the 80 bags/m3 figure to work out your requirement, or if your old like me, 2 bags/Ft3. THEN use your Perlite mix over that dome to keep the heat in.
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