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Post by cannyfradock on Oct 8, 2013 11:37:56 GMT
JSM
Not sure if I've correctly understood the question..let me know if got the q wrong...here's my answer......
I would use the same bricks on the entrance arch as the oven, but cut 5mm strips/slices of cal-cil and place between hearth bricks and entrance bricks. Leave the sliver of cal-cil about 10mm below the surface of the bricks, then fill the gap with fire-mastic ....or some dried clay, sand and ash mixed with a little water to make it "semi-dry".....bricks on the entrance should then stay warm, but not hot to the touch and the hearth bricks shouldn't disapate their heat out too much. (I've also used fire-rope and thin strips of insulation block)
Terry
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Post by jsmythk on Oct 8, 2013 13:33:53 GMT
Hi Terry,
You understood perfectly - Many thanks.
I will get creative when I get back to it this weekend and put in a 5mm thermal break.
I have enough Calc Sil board, but I also have some fireboard and rope kicking about in the garage so lets see what I can come up with.
Thanks again
JAS
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Post by jsmythk on Oct 14, 2013 10:46:11 GMT
Got a fair amount done over this last weekend, but drawings have gone out of the window and its a case of make it up as you go along! I made homebrew and put stuffed it all down inside the thermolite blocks that surrounded the first layer of vertical heater blocks that form the base of the arches of the oven. See pics below Attachments:
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Post by jsmythk on Oct 14, 2013 10:46:56 GMT
this pic shows the first arch up, taken from the back of the oven Attachments:
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Post by jsmythk on Oct 14, 2013 10:47:23 GMT
First arch plus the back wall Attachments:
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Post by jsmythk on Oct 14, 2013 10:51:34 GMT
The homebrew dried out pretty quickly, there seem to be some cracks but when I pulled the former forward for the second arch, it stayed up so I am hoping all is well with the bond. The heater blocks had dried out a fair bit, but I did get them pretty wet before I put them up. For the second arch, I made the homebrew more "runny" (that's a technical term) and it seemed to work fine. I then tried to figure out from my drawing how the entrance to the oven was going to work as I spent a fair amount of time designing it, but when I got around to it, it did not make sense so I just got on with the materials in front of me and made it happen! Attachments:
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Post by jsmythk on Oct 14, 2013 10:55:47 GMT
I put more of the 75mm Calc Sil board under the entrance and then cut a piece of extra strength Thermolite to sit in front of the heater blocks at the entrance of the oven. But just as I was shaping it, one of the sides broke, grrrrr + the odd swear word, but as it will be wedged by the next layer of heater blocks, I am not too concerned about it. Attachments:
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Post by jsmythk on Oct 14, 2013 10:58:00 GMT
Pic of the thermal break from above Attachments:
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Post by jsmythk on Oct 14, 2013 11:00:04 GMT
This pic is of a spirit level on top of the Thermalite block where the first layer of heater blocks will sit at the front face of the oven. Not bad for an amateur! Attachments:
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Post by Breadandwine on Oct 14, 2013 11:12:20 GMT
Jas, As someone who hasn't a clue what anyone on this thread is talking about - I have a chiminea for Christ's sake! ;D - and have NO DIY skills whatsoever, I just want to say what a huge pleasure it has given me, reading this thread! Your workmanship, and your pics, plus the helpful tips and advice you've been given have really warmed the cockles of this poster. Brilliant stuff, and I can't wait to see the finished results - and the first pizza, of course! Thank you for sharing your adventure! Hope you get it finished this year!
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Post by bookemdanno on Oct 14, 2013 12:25:58 GMT
You're doing just fine Jas! Easy innit? I keep seeing glimpses of your house around the edges of your oven photos and it looks mightly fine! A barn conversion?
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Post by jsmythk on Oct 14, 2013 12:52:41 GMT
Paulthebread - thanks for the kind words, fuel to keep me going!
Bookemdanno - thanks as well, it is not easy..... but I love every minute of it, just wish I had more focused time to spend on the build. Yup, it is a barn conversion, marvellous place, but converted by a cowboy so we are picking up the tab...!
I hope to get the rest of the arches built in the evenings this week and then start on the chimney and front arches next week.
Cheers
JAS
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Post by jsmythk on Oct 28, 2013 15:59:30 GMT
I have been busy over the past couple of weeks and no real time to focus on the build, but got a fair amount done on Saturday during breaks in the weather. I got the third arch up and started on the entrance to the oven, but got a little impatient and pulled my former forward too soon, the homebrew had not set and it all cracked, so I had to pull it down and start again. Very annoyed at myself. I have been using the 3:1:1:1 mix, the other arches seem to have set solid but there are a lot of find cracks which leads me think that the blocks were just not wet enough when I put them up. Attachments:
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Post by jsmythk on Oct 28, 2013 16:01:22 GMT
Pic shows the blocks cut to fit the entrance of the oven. Attachments:
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Post by jsmythk on Oct 28, 2013 16:04:24 GMT
this pic is taken from above showing the blocks for the entrance butted up to the thermal gap. I have not quite decided how to close the gap yet, Terry's suggestion above sounds good, but I am a bit concerned that I have made the gap too big! Attachments:
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