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Homebrew castable build, Newcastle UK

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  • Mullster
    replied
    mesoiam congratulations!!! I can almost taste it

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  • mesoiam
    replied
    Pizza at Last! Pretty pleased with the results, had two friends of ours round last night for the debut. Didn't take very long to get the oven up to temperature, (maybe just over an hour and the floor was 400), as it was already nice and warm from all the other fires. The first pizza was a bit burnt at the bottom but tasted good enough, nice and light and well risen with a nice thin crunch. I let off on a fire a little and let the floor get down to just below 300 and it seemed much more manageable, the next pizzas were excellent and everyone loved them, a bit of a relief as I had felt a bit of pressure to perform.
    Homemade pizza sauce, thanks to Mullster for the inspiration to actually make my own sauce, definitely an improvement over the random pasta sauce we were using before.
    These guys running their ovens crazily hot, how are you not burning the bottom? Now that I think of it my dough was a bit cold, as it had been in the fridge, maybe should have let it get up to temperature for longer.
    Anyway I'm a happy boy now, having a few more friends around tomorrow for more pizza and the littluns 1st birthday. Thanks to the great help from all on this forum. A friend of a friend has expressed interest in building one, I'll be sending him this way.

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  • Mullster
    replied
    mesoiam That looks great!!! Congratulations on making it so far - bet you can’t wait for that first pizza and I bet it is so satisfying when it comes enjoy!

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  • mesoiam
    replied
    Hello all, had a bit of time this weekend to start my curing fires and build a bit of a temporary roof until I can get it rendered. Into day 4 of curing fires now and it's going well. Oven is retaining heat quite well over night. Had the floor to 200 degrees C last night, it was about 100 C in the morning and about 70 by the evening. While waiting for the oven to dry I made a door out of two sheets of steel with the edges folded back, then filled the gap with about 50mm of 10:1 vermicrete. Door is functional but a bit crumbly so I'll probably fill round the edges with a bit of a stronger mix to keep the vermiculite in.
    Tonight I made my first bit of food as a tester, I had already had my dinner so I just got a potato waffle and put it in the skillet with a bit of cheese, 'Waffle Surprise', it was very nice and cooked in no time. Roll on pizza in a few days! Thanks to everyone for their advice and support, I'm chuffed with it so far. It was very nice just admiring the flames on a summer evening and thinking about all the nice food I'm gonna make in it.

    edit: I expected to see some condensation coming off my insulation onto the underside of the plastic sheet, haven't noticed any so far which I guess is OK. Insulation is doing well, can barely detect any heat on the outside.
    Last edited by mesoiam; 07-14-2020, 02:46 PM.

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  • WoodywWun
    replied
    Just going back to the earlier discussion about breathers/valve to release pressure under the final render coat, does the idea of a bent copper tube have any disadvantages (other than some folks don't want to leave something in for appearance reasons)? A bit of spare copper tubing and a plumber's spring and there is a cheap and effective solution? Does it need to be high tech and one-way?


    https://community.fornobravo.com/for...w-some-options

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  • Mullster
    replied
    Alomran that is so helpful - thank you!!!!

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  • Alomran
    replied
    Originally posted by Mullster View Post

    UK guys that find good materials (valves, caps, etc) for achieving this please share the info.
    Try https://www.ebay.co.uk/i/29276960597...CABEgKTjfD_BwE
    or
    https://www.ebay.co.uk/i/12263131235...iABEgJLB_D_BwE

    or

    https://www.ebay.co.uk/i/15201330389...SABEgK1ifD_BwE

    or https://www.ebay.co.uk/i/33332646255...CABEgKSM_D_BwE

    or https://www.ebay.co.uk/p/248565222?i...SABEgL3MfD_BwE

    City plumbing has
    http://www.flowfitonline.com/mintor-...CABEgJDEvD_BwE
    & https://www.cityplumbing.co.uk/Kings...?gmcpid=994214
    there few models in https://www.flowfitonline.com/search...&name=MA01.pdf

    If not available you can get the smaller one for a motor Harley's !!
    https://www.ebay.co.uk/itm/Motorcycl...sAAOSwD5teLqnV


    You can buy any trailer's fuel or oi tank valve.

    For all the aforementioned, you are advised to contact the seller to ensure that the valve is

    1- Metalic
    2- the valve is a one-way valve allowing air out (BUT NOT IN).

    You can search for any odd truck's fuel vent valve
    I got a bus's fuel tank valve for my oven!

    good luck
    Mustafa
    Last edited by Alomran; 07-03-2020, 03:30 AM.

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  • sergetania
    replied
    Does that breather valve need to be itself protected from the elements? Will rain, oxidation, dust mess up its ability to release moisture? Thanks!

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  • UtahBeehiver
    replied
    In the UK it is called a Breather Valve, all types, bottom line you want something that lets the moisture out but not let the rain or water in.

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  • Gulf
    replied
    ......The copper tube was then bent over slightly to stop rain getting in.....Is this still a viable method as it seems the most simple?.....
    It is in my opinion. That was the first design that I saw. I believe that cobblerdave did this. I like any threaded design that allows the vent to be removed and plugged once the oven is dry. It's not necessary to remove it, but some don't like the look of it there all the time.

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  • Hattori-Hanzo
    replied
    I'm starting to think about this stage myself and read a post where copper tube was inset into the render that pasted through to the ceramic blanket layer. The copper tube was then bent over slightly to stop rain getting in.

    Is this still a viable method as it seems the most simple?

    It was suggested that one copper tube near the top of the dome would suffice but could I also add some near the bottom as David suggests to help moisture release further?

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  • Mullster
    replied
    As always, awesome information DavidS andGulf - really helpful.

    As I said - UK guys that find good materials (valves, caps, etc) for achieving this please share the info.

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  • mesoiam
    replied
    Thanks all, some good detail on this thread

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  • Gulf
    replied
    Here is an old cross section of my oven.

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  • david s
    replied
    Around a decade ago we received a new kiln at the school where i was teaching and it required firing to service temperature (1180 C), empty apart from kiln furniture. I was surprised to see at 400C (750F) water dripping from the front righthand bottom corner of the kiln making a puddle of around 100 ml on the floor. I was surprised that this was happening at such a high temperature. I surmised that the water was being pushed out of the insulating firebricks condensing on the inside of the cooler outer casing and running down to exit at the bottom.

    So perhaps a 4th alternative would be to make a few weep holes near the base of the dome, but higher than at the slab level, so water won't enter there. This could be a good location because as the top of the dome dries out first and steam gets driven out to hit the inside of the cooler outer shell where it condenses then falls down, the wettest part is going to be at the base of the dome. Steam pressure from the top of the insulation space in this case will act to force moisture to exit at the lower vent holes.

    Click image for larger version  Name:	IMG_1112.jpg Views:	0 Size:	464.5 KB ID:	425156

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