#11  
Old 10-20-2007, 08:29 PM
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Default Re: Italian, Australian Oven

So just the chimney needs to be bricked up a little more and some finishing touches, but other than that this time next week we will be curing it.



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  #12  
Old 10-21-2007, 07:57 AM
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Default Re: Italian, Australian Oven

Looks good. One question, you are going to make the opening to the chimney larger than one brick aren't you?
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  #13  
Old 10-21-2007, 04:03 PM
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Originally Posted by Unofornaio View Post
Looks good. One question, you are going to make the opening to the chimney larger than one brick aren't you?
Thats what i told my dad at least 2 bricks, he's convinced 1 is enough since his mother's old wood oven (made mainly for bread) is the same. I still dont understand the real reason for making it larger? anyone care to explain?
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  #14  
Old 10-21-2007, 05:25 PM
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Default Re: Italian, Australian Oven

Well, the larger the opening the more room smoke and hot gasses have to go up the chimney.. With a one brick width all your smoke and fire is going to lick the inside and front of the arch center and blacken it. It would be interesting to know if the front of the other oven is like that, I'm sure it is, it has to be.
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Old 10-21-2007, 08:13 PM
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Default Re: Italian, Australian Oven

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Originally Posted by Unofornaio View Post
Well, the larger the opening the more room smoke and hot gasses have to go up the chimney.. With a one brick width all your smoke and fire is going to lick the inside and front of the arch center and blacken it. It would be interesting to know if the front of the other oven is like that, I'm sure it is, it has to be.

Ok i asked my dad and finally got a reason. He said its a small 1 brick hole on the opening but then opens up further (not sure how much) as the chimney is built. He said it acts as a suction which is better (he has built many more chimneys than i have).

The only way to really know is use the oven for a couple of months and see the effects.

Thanks for the heads up thow
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  #16  
Old 10-21-2007, 09:13 PM
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Default Re: Italian, Australian Oven

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Originally Posted by Ageo308 View Post
He said its a small 1 brick hole on the opening but then opens up further (not sure how much) as the chimney is built. He said it acts as a suction which is better
It's a venturi. Bernoulli's Principle.
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Old 10-21-2007, 09:29 PM
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It's a venturi. Bernoulli's Principle.

Is it? lol i dont even know.
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  #18  
Old 10-21-2007, 10:31 PM
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Default Re: Italian, Australian Oven

Way to go guys. That's excellent.

I see that you built the shape for your oven enclosure with wire, but not rebar. How did that work? Also, how are you going to waterproof the oven?

Looking good.
James
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Last edited by james; 10-21-2007 at 10:58 PM.
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  #19  
Old 10-22-2007, 01:18 AM
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Way to go guys. That's excellent.

I see that you built the shape for your oven enclosure with wire, but not rebar. How did that work? Also, how are you going to waterproof the oven?

Looking good.
James
James, when rendering we always use chicken wire (recommended by the field furnace guys also). Has worked for 100's of ovens (over the years).

As for waterproofing do you mean the dome? (im assuming yes) if yes water doesnt penetrate render (a mixture of builders clay, sand and cement). Its like when you cement render a house, water doesnt penetrate the walls. And it wont affect the heating of the oven because of the insulation (the blanket is over 2 inch's thick and in some areas we are doubled up). So the heat from the oven will be absorbed by the bricks/mortar and then the rest is soaked up from the insulation.

To be honest this is a 1st for building 1 but we have seen many been built and have gotten advice from people that have built many for years. The only way to really know if its good or not is too actually use the oven for 2 months and then see.

hopefully everything should be fine

A good example was today, outside today it reached 37 degrees Celcius (98.6 degrees F). But inside the dome it was really cool as the insulation kept the heat out (which would work vica versa, meaning it will keep the cold out when raining).

Lets wait and see
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  #20  
Old 10-22-2007, 07:46 AM
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Default Re: Italian, Australian Oven

Very interseting..well, if he has built many than I'm sure its a proven method. Please try to document the chimney building with photos I'm very interested in seeing this and I'm sure others are as well.
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