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  #41  
Old 10-04-2009, 06:41 AM
dmun's Avatar
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Location: New Jersey USA
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Default Re: Insulation Efficiency

I'm so glad you insulated under the floor. You want your oven to be enveloped in insulation except for the opening. This is particularly important in cold weather use, when fire wood is damp, and it's harder and longer to get up to temperature anyway. I keep a couple of armloads of smaller wood in the basement so it's warm and dry to get the oven started in the winter.
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  #42  
Old 10-05-2009, 06:50 AM
Serf
 
Join Date: Jun 2009
Location: usa
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Default Re: Insulation Efficiency

Getting wood is on the horizon. Fortunately, the is a tree remover in my neighborhood who has lots of cord wood. He's always let me have what I want, and I live in a wooded area, so I can go wood hunting once I get to that point. My main concern is getting everything done before it gets too cold. wish me luck.
thanks for the input.
Dom
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  #43  
Old 10-05-2009, 06:03 PM
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Join Date: May 2009
Location: Austin, Texas
Posts: 102
Default Re: Insulation Efficiency

I purchased 3 boxes of the FB blanket and it was more than enough to swath the entire dome and entry of my 36 inch oven in four layers of the stuff with some leftover. After a few firings where the dome was well over 900 degrees I can safely say the top and back of the stucco dome conducted barely any heat from the heat inside the dome. The stucco dome felt about the same as the ambient air temperatures outside. After wrapping the dome and blanket with chicken wire I can say my first ever attempt at stucco came out pretty good and it was quite easy. I don't know if I had tried the vermiculite path whether I would have had the same results.
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  #44  
Old 10-13-2009, 05:52 PM
Serf
 
Join Date: Oct 2009
Location: Phinny Ridge Seattle
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Default Re: Insulation Efficiency

Quote:
Originally Posted by DimTex View Post
I purchased 3 boxes of the FB blanket and it was more than enough to swath the entire dome and entry of my 36 inch oven in four layers of the stuff with some leftover. After a few firings where the dome was well over 900 degrees I can safely say the top and back of the stucco dome conducted barely any heat from the heat inside the dome. The stucco dome felt about the same as the ambient air temperatures outside. After wrapping the dome and blanket with chicken wire I can say my first ever attempt at stucco came out pretty good and it was quite easy. I don't know if I had tried the vermiculite path whether I would have had the same results.
say, how many inches of FB blancket did you end up with on your 36"?
Since you used 3 boxes did you get 4" of insulation out of it?
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  #45  
Old 10-13-2009, 06:54 PM
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Join Date: May 2009
Location: Austin, Texas
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Default Re: Insulation Efficiency

Yes, I did
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  #46  
Old 10-14-2009, 10:13 AM
philiph4@ameritech.net's Avatar
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Join Date: Aug 2009
Location: Farmington Hills, MI
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Default Re: Insulation Efficiency

I had 1 box of 50 sf of koawool and got 2 inches over my dome. I fired the oven and it got to at least 700 degrees because the dome went clear. Without a door the oven was still quite warm in the morning. The top of the dome was warm but not hot. I am going to cover the dome this weekend with vermiculite cement (Igloo design). But I am feeling pretty good that I already have enough insulation and the vercrete will be a bonus.

Phil
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  #47  
Old 10-14-2009, 03:39 PM
Il Pizzaiolo
 
Join Date: Mar 2009
Location: USA
Posts: 1,436
Default Re: Insulation Efficiency

having too much insulation is like having too much money... is that possible ??

It sounds like you'll be fine

Cheers
Mark
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  #48  
Old 10-14-2009, 10:16 PM
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Join Date: Apr 2009
Location: UK
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Default Re: Insulation Efficiency

guys the overall thickness of my dome is just over 6 inches nearly 7 on the top after cooking that is mainly lamb n potatos rubbed in foil burried under the ash that is after at least an hour burning n maybe up to 2 hours cooking the top of the dome is hardly warm the sides are fairly hotish i used alltogether two bags of vermiculite but of course i used a lot more on the top n half the bag was used under the bricks i feel am using more heat than i need as after not to waste heat i dry logs in the oven n it keeps the heat till at least 18 hours later also it fires almost as good without FLUE finally what is the best material to use on the 35mm stone door as that get HOT n what's best to use for sealing the door without having to use clay everytime i cook i used vermiculite on the door but eventually it came off CAN I USE SYNTHETIC ASBESTOS ROPE AS USED ON BOILERS TO SEAL THE DOOR TO THE OVEN? were the door fits its also cut from the same thickness paving stone just need to be able to seal the heat in without using plaster or clay everytime but what material can i use?
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  #49  
Old 10-15-2009, 03:01 AM
Il Pizzaiolo
 
Join Date: Mar 2009
Location: USA
Posts: 1,436
Default Re: Insulation Efficiency

Havefun,
I have a wooden door, 2 inch hard maple with 2 pieces of 18 gauge sheetmetal on the side that faces the oven.. I also had to wrap the edges with aluminum foil otherwise they started burning.. I will change the foil to aluminum angle iron, You can also make a door out of FB Board, Some have cast theirs out of refractory cement.. I thought about the synthetic rope seal as well, but found with my wooden door I was able to shape it to an almost exact fit.. and had very little heat loss, I cooked a 13 lb turkey in a little over an hour and a half... Cant beat that with a stick... The wood door can also be soaked in water to keep it from burning and the steam released into the oven is very good for baking bread ( I believe it helps the crust) My next door, will not be hard maple though as it is very dense and doesnt allow it to soak up much water... Hope I helped you and not confused you
Cheers
Mark

Last edited by ThisOldGarageNJ; 08-16-2010 at 05:50 PM.
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  #50  
Old 10-15-2009, 05:49 PM
Serf
 
Join Date: Apr 2009
Location: UK
Posts: 10
Default Re: Insulation Efficiency

Hi Mark thx for your reply u not confused me just reinforced what i was thinking to do accually i just got hold of some off cuts from a mate builder here they are called peltex its a 4 inch insulation some are 5 with fairly thickish aly tape like linning on one side n about 3/8 ply on the other n i was about to cut it to shape over the stone door but overlap it about couple of inches,

then was thinking to use a 4x2 timber between the two shelter supporting timbers so as it presses hard against the door hopefully it will push the insulation into shape n give me a good seal

so now i will try it just have to shape it round the door handle as i don't fancy the handle been secured on the ply, as the door is at a small angle the more i push the timber down the harder it will push the door against the oven opening (that is also made from stone) overlaped with clay mixure if i still lose heat i'll try some rubber on the overlapping peltex as its far less hot there
next i got to work out how long to get the oven hot i think now am getting it hotter than i need to n i really hate waste even the timber is free CO2 its NOT!
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