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  #21  
Old 02-11-2010, 10:28 PM
david s's Avatar
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Join Date: Mar 2007
Location: Townsville, Nth Queensland,Australia
Posts: 4,824
Default Re: Poll: How hot is the outside of your igloo?

We've had a deluge of rain up here, rain gauge over flowing daily. I fired my oven for the first time in a few months and the outside was hot to touch (it's normally just a bit warm at the top.) Obviously some moisture has got in and the insulation is not so effective. It's also very very humid here in the tropics, so even though the exterior is weatherproof moisture has got in. It took me 2 hrs to get to temp which is way slower than usual. The wood was also damp which doesn't help.
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  #22  
Old 06-08-2010, 10:52 PM
Apprentice
 
Join Date: Oct 2009
Location: Seattle, WA
Posts: 121
Default Re: Poll: How hot is the outside of your igloo?

Useful information.

I'm still debating between 2" and 3" of insulation - looks like it would be about $100 per 50 sq ft. roll locally for some 8lb Superwool insulation (Superwool - 1 In Thick - 24 In Wide Synthetic Vitreous Fiber - 8 Lbs Per Sq Ft). Sounds like 50 sq ft equals about 1 layer, so $200 for 2" or $300 for 3".

I'm thinking I will probably start with 2 rolls and see how far I get and then maybe add a 3rd if necessary.
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  #23  
Old 06-09-2010, 12:20 AM
BackyardPermaculture's Avatar
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Join Date: Mar 2010
Location: Brisbane, Australia
Posts: 151
Default Re: Poll: How hot is the outside of your igloo?

tfasz,

My oven is reasonably small and is not an igloo - it's enclosed. But my insulation worked out significantly cheaper than that:

- A 25 sq ft roll of insulation easily covered my dome/arch once, with enough to cover the top twice.
- Insulation is "Tombo" brand rockwool, made in Indonesia. It has an operating temp of 650c (1200F)
- 2" thick roll, so my dome top has 4 inches over it

The whole roll cost me about $50 from an industrial insulation guy - not sure if it's available where you are, but it works really well and was a great price.
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  #24  
Old 06-09-2010, 06:14 AM
Apprentice
 
Join Date: May 2009
Location: Austin, Texas
Posts: 102
Default Re: Poll: How hot is the outside of your igloo?

I used the insulation offered by Forno Bravo, bought three boxes and laid down 4 layers with some left over. My oven may get over 900 degrees F but the outside has always remained the same as the ambient air temperature. I can see how much I have left over and if you'll cover shipping I will send it to you for free?
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  #25  
Old 06-09-2010, 08:46 PM
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Join Date: Oct 2009
Location: Seattle, WA
Posts: 121
Default Re: Poll: How hot is the outside of your igloo?

@DimTex - Thanks for the offer - would certainly be interested. Someone else in the Seattle area mentioned they might also have some Superwool left over. How much do you think you have left? Send me a PM or e-mail me via Gmail at toddfas. Thanks!
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  #26  
Old 06-10-2010, 08:21 AM
Banned
 
Join Date: Feb 2010
Location: Bend, Oregon
Posts: 131
Default Re: Poll: How hot is the outside of your igloo?

My oven is 100 F when my oven on the inside is 1000+ and it takes about 1 hour to 1 hour and 15 mins to heat up

This is the BEST PLACE TO BUY all your insulation..... They have scrapes and it is cheap...

http://hightempinc.net/

Last edited by 100million; 06-10-2010 at 08:25 AM.
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  #27  
Old 06-29-2010, 08:42 PM
ksm ksm is offline
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Join Date: Jul 2008
Location: Rhode Island
Posts: 39
Default Re: Poll: How hot is the outside of your igloo?

I have a Toscana from Forno Bravo; the outside only gets up to 100F even after three hours of high firing prior to bread baking (the laser gun maxes out at 974F and the dome is hotter than that for the last two hours) . The underneath gets very warm to the touch as well. I've never bent down to aim the laser at it to get a specific temp, though. This Toscana is built from the older Casa 100, with an extra inch of mortar over the dome and an extra layer of insulation under the hearth. It would have the "FB standard" insulating blanket over the dome.
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  #28  
Old 06-29-2010, 10:17 PM
Apprentice
 
Join Date: Oct 2009
Location: Seattle, WA
Posts: 121
Default Re: Poll: How hot is the outside of your igloo?

Chris - thanks for the tip on HIGHTEMP INC.. I ordered some Superwool insulation from them Monday morning and it was on my doorstep Tuesday afternoon. No tax, and even with shipping was still less than from my local supplier.
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  #29  
Old 10-10-2010, 05:32 AM
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Join Date: Jan 2010
Location: brisbane australia
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Default Re: Poll: How hot is the outside of your igloo?

I'll throw this in the pot
My wfo has 55mm 21/4in Hebel cemmet block layer under the hearth. Dome insulation is 1200 C ceramic insulation 1in thick all over and extra inch over the top down to 8in from bottom then this is covered with Fiberglass insulation 4in.
Wire and cement render over this. Works... seems to. Gets warm on top but you can comfortably hold you hand on it. Junction of dome and brick chimney does get noticabily warmer. perhaps the heat travels up the brick. the cement slab remains cool with a warm spot in front.im sure this is because the hebel stops and the hearth bricks continue past them.
before I forget the fire bricks are "lighter" 29 per cent silica.

regards dave

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  #30  
Old 10-10-2010, 10:49 PM
eprante's Avatar
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Join Date: May 2009
Location: El Cajon CA
Posts: 282
Default Re: Poll: How hot is the outside of your igloo?

I cooked pizza tonight, the inside of the dome was hotter than my HF infrared thermometer could read ( 1000 F) and the outside of the dome was 89 degrees, about 10degrees above ambient temp. I used the ceramic blanket (2 rolls) sold by FB, then stucco over the top of it. I think James has a winner with this insulation, and his price was better than than I could find for comparable products- no this doesn't mean you should raise your price James!
Here is a picture of some San Marzano tomatoes I picked today to make the sauce.

Eric
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