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Post by rivergirl on May 24, 2015 21:44:52 GMT
Good one Dave!
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Post by yorkshire on May 24, 2015 22:41:23 GMT
Ok, so just been thinking, I am a little tight for space around the edges of the dome for insulation. I have seen that the vermicrete option is not as good an insulator as the blanket, so would I be better to have 75 mm of blanket, then render or 50mm blanket and then vermicrete 50mm on top of that (could be a little tight for this) Then a render coat. I am guessing that the vermicrete gives a solid base for the render, or is the render strong/tough enough just over blanket?
Hmm thoughts if you have them please........
thanks Adam
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Post by cobblerdave on May 25, 2015 9:54:34 GMT
G'day Once you have a piece of ceramic blanket in your hands you'll soon see it's not like domestic fiberglass insulation. It's quite stiff in comparison. Once pushed into position it stays where it's put by itself. You can sit on it without it squashing down unlike a fiberglass bat. My own oven has ceramic and a top coat of rockwool then render. I'm not discouraging pearlite/ cement either buy the way. It's fairly cheap and avaliable. It's a bit of a learning curve to use but once in position and dry it does the job of containing those temps. And if push comes to shove a good layer of well trodden cow poo, clay and straw will do the job. Regards dave
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Post by cobblerdave on May 25, 2015 10:24:10 GMT
G'day Sorry got of the point a bit forgot about thickness. Most precast ovens come with 25 mm of ceramic insulation. Of course it works otherwise they would sell many. Most brick home oven makers use 50 mm of ceramic or 100mm of pearlite vermiculite cement. Anything over that is extra Your safe Regards Dave
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Post by yorkshire on May 27, 2015 11:27:04 GMT
Cheers for the information Dave, will see how much space I have and work around it somehow, definitely with the fibre, as I have it and then possibly a layer of the vermiculite then the render..... Still a little way off this yet, but planning and ordering material where I can keep ahead of the build...
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Post by yorkshire on May 30, 2015 19:42:24 GMT
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Post by yorkshire on May 30, 2015 19:43:51 GMT
So next question. ? i will put a tarp over it to keep dry, but when do I start the drying fires..... Starting to get a bit giddy!!
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Post by yorkshire on May 31, 2015 8:58:39 GMT
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Post by oblertone on Jun 1, 2015 8:43:09 GMT
Very nice finish on the dome ! I used my oven for a year before insulating it, but a more common route is small fires for a week at least increasing in intensity; some have started the drying process using halogen lighting or even tea lights ! I totally agree that you should dry it out before insulating it as otherwise you're just trapping moisture.
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Post by yorkshire on Jun 1, 2015 10:56:48 GMT
Cheers oblertone for your comments and advise. There is something very satisfying about creating something like this for the first time. Now got to scratch my head on the chimney, as trying to make it removable so it does not weather too much in this lovely British climate..... And making the outside look nice!
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Post by yorkshire on Jun 6, 2015 16:28:55 GMT
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Post by yorkshire on Jun 20, 2015 22:43:14 GMT
So been a couple of weeks since the last update as was away last weekend. now added a chimney and laid the entrance. Also mocked up how it should all look once complete. Just need a good day or so to start and finish the render. Also so made a start to the door. But..... Managed to get pizza tonight, as well as some chicken wings! Wow wow wow... .pizza was great!
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Post by cobblerdave on Jun 21, 2015 7:14:59 GMT
G'day Very neat looking oven, you've ever right to be proud of you efforts. Well done. What are you planning for you door? Regards dave
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Post by smagsmith on Jun 21, 2015 8:21:34 GMT
Great progress. Much faster than me. Once you finished your thermo blocks, what did you use to bed the hearth on? Sand or mortar or just straight on the thermos with nothing?
Cheers Smag
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Post by yorkshire on Jun 21, 2015 10:23:18 GMT
Dave, thanks for the comments, it has been a very satisfying experience, as I have mentioned before, without this site and the comments from the members, it would have been very difficult and long drawn out process with lots of mistakes, so thank you. What did we do without the internet!!!
For the door I have a block of oak that I will face on the heat side with a metal baking tray filled with ceramic blanket. I just rested the door last night against the opening and I still had 180c this morning,
When I got the oven up to temp, 450c ish at the top there was either steam of smoke coming from the dome, I hope that it was just residual water being driven off, and not smoke, which means cracks......I guess I will see when I have rendered and then have the next Fire.
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