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  #21  
Old 10-14-2012, 08:25 AM
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Default Re: Joint finish ?

Quote:
Originally Posted by jim81147 View Post
David is correct , the extra thermal mass is what I am calling cladding . My 2 resources are this forum and "the bread builders" book
To quote others on this forum "Alan Scott is a great baker but not a great Oven Builder"

What do you plan to use the oven for? Bread, Pizza, All around cooking? And how often do you intend to fire it? Daily for mass production? or home use.

The reason I ask these questions is, Thermal mass = more wood and time to get it hot.

The oven will stay hot for long periods of time with lots of mass and lots of insulation but if you are not a production baker. 20 - 40 loaves of bread a day it is overkill. If you have lots of mass and little of no insulation under and over the oven I hope you own your own forest.

You would be much better off using more insulation and forget the 4 extra inches of mass. And ditch the foil it is a really bad idea.

If you primarily bake bread you may want to stand your bricks on their side to get a 4+ inch thick floor to match the thickness of the dome. but that is the only thermal mass I would add.

My Two cents.

Chip
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  #22  
Old 10-14-2012, 09:59 AM
Peasant
 
Join Date: Oct 2012
Location: colorado
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Default Re: Joint finish ?

My plans are for mostly bread baking at this point with the occasional pizza or general cooking . I dont see myself using this oven every day , probably more like once every 7-10 days during summer months with a bit more frequency in the winter months . I have more time in the winter so thats when i would use it more . I see from looking at some of the build threads here that cladding ( thermal mass ) does not seem to be standard , or even important ( other than the mass of the bricks themselves ) but my brain just does not seem to understand this concept I guess .
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  #23  
Old 10-14-2012, 10:26 AM
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Default Re: Joint finish ?

Put the book on the shelf and do not reference it for an oven unless you plan on making multiple batches per day every day.
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  #24  
Old 10-14-2012, 10:50 AM
Peasant
 
Join Date: Oct 2012
Location: colorado
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Default Re: Joint finish ?

So what kind of heat retention could i expect with just the firebricks sitting on 5 1/2 inches of perlcrete with 7 inches of perlite covering the sides , back and top?
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  #25  
Old 10-14-2012, 10:59 AM
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Default Re: Joint finish ?

If I fire mine on Sunday evening for 2 hours to 1000 degrees and door it off after cooking, it will take it until Thursday or Friday to reach ambient, and is usable for cooking through Wednesday. You should be able to do the same.
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  #26  
Old 10-14-2012, 11:12 AM
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Default Re: Joint finish ?

Hi Tscarborough,

Your oven will maintain usable heat that long, with the door off? Mine with the door off and there a breeze or a windy day will be sapped of heat within 1 1/2 days. With the door on I can cook for a week.
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  #27  
Old 10-14-2012, 11:37 AM
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Default Re: Joint finish ?

No that is with the insulated door on.
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  #28  
Old 10-14-2012, 01:04 PM
Peasant
 
Join Date: Oct 2012
Location: colorado
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Default Re: Joint finish ?

Tscarborough , what kind , and how much insulation do you have? And does it make a difference being a vault instead of a dome? Thanks.
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  #29  
Old 10-14-2012, 02:09 PM
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Default Re: Joint finish ?

It is a built up door of heatstop refractory cement and perlite. Vault vs dome, no. I put this in 4 hours ago after a low fire to 300 degrees:
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  #30  
Old 10-14-2012, 02:16 PM
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Default Re: Joint finish ?

This is what it looks like now, I closed the tinfoil over it and it has a couple more hours to go. The oven is at 275 degrees.
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