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  #181  
Old 11-29-2013, 11:59 AM
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Default Re: Insulation Efficiency

Organic material is not a good idea.
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  #182  
Old 12-01-2013, 03:38 PM
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Default Re: Insulation Efficiency

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Originally Posted by stonecutter View Post
Organic material is not a good idea.
Gudday
How very true, organics rot or burn either way they return to the carbon of which it was made. You can use this characteristic you you advantage though to make a low tec insulation.
Chopped straw, rice husk, sugar cane mulch whatever and use enough watery clay to bind it will give you an insulating material. Even in the absence of oxygen the heat will break down the particles and if not it will break down over time anaerobic. It make an insulation that will go over an oven. If you pack it into glass jars and pack them together with something around to contain them it will be strong enough to support a small oven.
Efficient ... No not really but better than nothing at all.
But efficiency is what you think it is. A home oven is not really efficient as much of the heat is wasted. I'm guessing here but it would probably take 5 or 6 kg of wood for each kg of bread (food) cooked. It would be more efficient to keep it flashed up permanently and feed a number of households
Anyway that's my take on that
Regards dave
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  #183  
Old 05-22-2015, 06:04 AM
Serf
 
Join Date: Mar 2015
Location: Milton Keynes/Uk
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Default Re: Insulation Efficiency

Hi there guys. Searching through this thread but can't find what ratio mix people have used for the vermiculite concrete that you put around the insulation blanket around the dome?
Is it purely just a vermiculite/cement mix?
Also what method have people used to apply it onto the dome?
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  #184  
Old 05-22-2015, 06:49 AM
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Default Re: Insulation Efficiency

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Originally Posted by FrankHawkins View Post
Hi there guys. Searching through this thread but can't find what ratio mix people have used for the vermiculite concrete that you put around the insulation blanket around the dome?
Is it purely just a vermiculite/cement mix?
Also what method have people used to apply it onto the dome?
According to my notes, I used 8: 1 vermiculite: portland around the lower third or half or so, then 4: 4: 1 vermiculite: perlite: portland for the next third or quarter or so, and then 5: 5: 1 for the top layer. I then hydrated it approximately 3: 1 mixture: water. There's pictures and videos somewhere in my account's albums, in my account's primary build discussion thread, and on my website (and on youtube):

Brick Pizza Oven Models and Photos
(Each picture has some notes below it, so expand the pictures at the vermicrete stage for details.)
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  #185  
Old 05-22-2015, 07:59 AM
Serf
 
Join Date: Mar 2015
Location: Milton Keynes/Uk
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Default Re: Insulation Efficiency

What is perlite? And what is its difference to vermiculite? As I have bought vermiculite to do all of the outer dome with. Will it be ok to do it that way?
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  #186  
Old 05-22-2015, 02:14 PM
kebwi's Avatar
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Default Re: Insulation Efficiency

Quote:
Originally Posted by FrankHawkins View Post
What is perlite? And what is its difference to vermiculite? As I have bought vermiculite to do all of the outer dome with. Will it be ok to do it that way?
Don't worry about it. It's very similar to vermiculite and used for similar purposes. I used it because I had a limited supply of vermiculite and could obtain perlite more easily when I ran out. Treat them as identical for the purpose of making insulating concrete.
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