I also have this single skin steel door that fis on the outside for use when heating up, or for a short term closure. The bar across the bottom pulls out to allow for a strong draw when doing the initial burn.
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Thailand Barrel Dome Build - $400 to completion (my labour free!)
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Nice doors! Let us know how hot your handles get with the use of AAC core. Also my inner door is steel and have found that fitting the outer door can help hold in heat overnight. I don't have any quantifiable measurements but the inner door skin remains much hotter when the outer door prevents direct heat exchange with drafty outside air.My build thread
https://community.fornobravo.com/for...h-corner-build
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So, I said I would report back on temperature...
I closed it up yesterday evening having had it nice and hot for making pizza. I closed it up with both the chunky internal door and my single skin external door. From what I could see before going to bed the outside of the chunky door never got above 65C (150F) and was about 55C (130F) this morning (with the external door fully closed too, so head somewhat trapped in that void, albeit with an open chimey to vent heat).
When cooking pizza yesterday the oven side walls had maxed at about 450C (840F), and were at about 350c (660F) when I closed it up. There was still with a reasonable amount of chunky embers in the oven when I shut it up.
I opened the door 13 hours later to begin baking and side walls were still at 260C (500F). Pretty happy with that :-)
An hour later I opened her up to check on the pork roast and roast potatoes, walls still at 255C (490F) and spuds and roast looking good.
Cake is next, when it has cooled a bit... :-)
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Welcome to the world of multi-day cooking - it's one of the things we love the most about having the WFO!My build thread
https://community.fornobravo.com/for...h-corner-build
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One of the problems of a barrel arch is the inherent instability of its semicircular form. This usually then requires either steel bracing or buttressing of the wall to counteract the tendency of outward thrust on the walls. It appears as though you have not used a hemisphere, but gone for a catenary archeo overcome this problem. Unfortunately to design an oven with its internal height half of its base results in walls that slope in considerably at the base. I see you have made a compromise here by making the oven pretty tall in relation to its base. Many kilns have used catenary arches for the same reason. The end walls for such a structure are better placed under the vault to avoid the outward thrust tending to push them out. To build end walls leaning against the vault like this is not recommended in kiln design, but you may get away with it for an oven as there is around half the maximum temperature to that of a kiln and hence half the expansion. However the same principle still applies.You may have trouble down the track with many heat and cooling cycles and the resulting expansion and contraction. The weak point is the vertical joints at the corners which all line up.
By the way I am a big fan of catenary arches.
https://community.fornobravo.com/for...kiln#post14564Kindled with zeal and fired with passion.
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Originally posted by david s View PostOne of the problems of a barrel arch is the inherent instability of its semicircular form. This usually then requires either steel bracing or buttressing of the wall to counteract the tendency of outward thrust on the walls. It appears as though you have not used a hemisphere, but gone for a catenary archeo overcome this problem. Unfortunately to design an oven with its internal height half of its base results in walls that slope in considerably at the base. I see you have made a compromise here by making the oven pretty tall in relation to its base. Many kilns have used catenary arches for the same reason. The end walls for such a structure are better placed under the vault to avoid the outward thrust tending to push them out. To build end walls leaning against the vault like this is not recommended in kiln design, but you may get away with it for an oven as there is around half the maximum temperature to that of a kiln and hence half the expansion. However the same principle still applies.You may have trouble down the track with many heat and cooling cycles and the resulting expansion and contraction. The weak point is the vertical joints at the corners which all line up.
By the way I am a big fan of catenary arches.
https://community.fornobravo.com/for...kiln#post14564
If you look on the pics of my bare arch you will see it isn't really catenary, but not a true hemisphere either. The outer walls are much more of a catenary shape, designed to allow for even more insulation on the top of the arch - and because I liked the shape!. I am hopeful that with the outer shell of blocks and the glass fibre reinforced render that is coming soon it will all hold up well! The inner fire bricks also have very thin mortar joints and are shaped to fit well - hopefully this will also limit movement. We shall see!
Thank you for your thoughtful comments :-)Last edited by JimShortz; 03-15-2021, 02:37 AM.
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G’day
If you follow the link at the bottom of my post you’ll go to my door construction.
Basically a wood face with a AAC block back stuck on with silastic. The AAC provides plenty of protection for the silastic witch is good for 600C from memory.
The doors now got to be 8 years of service now couple of chips and cracks but still does the job it was made for.
Regards DaveMeasure twice
Cut once
Fit in position with largest hammer
My Build
http://www.fornobravo.com/forum/f51/...ild-14444.html
My Door
http://www.fornobravo.com/forum/f28/...ock-17190.html
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Originally posted by cobblerdave View PostG’day
If you follow the link at the bottom of my post you’ll go to my door construction.
Basically a wood face with a AAC block back stuck on with silastic. The AAC provides plenty of protection for the silastic witch is good for 600C from memory.
The doors now got to be 8 years of service now couple of chips and cracks but still does the job it was made for.
Regards Dave
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Nearly there... AAC blocks rendered with special AAC render with fiberglass strands added, then rendered over the top of this with a more traditional cement and sand render with a waterproofing agent and fiberglass strands added. I'd love to say that this was me, but rendering this dome shape over the top of blocks that by their nature are a series of straight blocks is way beyond me. My good friend did this for me and I am super pleased!
I'm now just waiting for it to dry out properly over the next month, seal it (concrete sealer), paint it (roof paint), install the chimney, and we are back in business!
I'm pretty stoked with how it is looking. My friend is a star!Last edited by JimShortz; 04-14-2021, 07:34 AM.
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That looks good! Well done!My 42" build: https://community.fornobravo.com/for...ld-new-zealand
My oven drawings: My oven drawings - Forno Bravo Forum: The Wood-Fired Oven Community
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