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  • sergetania
    replied
    Originally posted by Daveholdn View Post
    sergetania cheers, aye not too far off, just put up the pizza cover so going to start the 7 days of fires as suggested by david s in his previous posts. I've read your posts and the build looks amazing, did you render straight after the curing fires?
    Dave
    ​​​​​
    I have waited a couple of weeks before rendering to let the vcrete dry while also doing the curing fires. The vcrete has become gray, you could tell there's much less moisture in it.

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  • Daveholdn
    replied
    david s thanks again, I've ordered some AR fibres, just in case.

    First fire yesterday, 1 newspaper sheet, a firlighter, handful of beads and about 6-7 tinder sticks, big event, next door neigbours and family round think they expected more than a wee 5 minute flame, but internally the oven has no cracks and all good on the outer. My friend brought his super expensive structural engineering thermal imaging camera round and reckon it got to around 230-250 degrees celcius at the top of the dome. Flue worked well and happy, just gutted my pristine smooth round grey internal is now black and carbon

    Do most people use a normal thermometer when cooking or is it OK to presume once it clears at the top from smoke your ready to cook?

    Also with doors, has anyone had any issues or pointers, I'm thinking a cement board backer with a moulded homebrew mix secured to it and some fire rope on the lip to ensure good contact and insulation?

    Angain any advice greatly appreciated.

    Cheers

    Dave
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  • david s
    replied
    You might as well throw in the fine polypropylene fibres, but for strength the thicker and longer AR fibreglass fibres are better. The fine fibres require more mixing than you'd think in order to disperse adequately.

    The best wood is free wood, but never use treated timber.

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  • Daveholdn
    replied
    Hi david s, hope your well mate and thanks for the reply. Aye the flue extension is coming today, I mismeasured how high the roof would actually be so a 5 inch extension peice has been ordered. The neighbours seem on board with it and said they don't care as long as there is pizza thrown their way!
    Just one on the render once the fires have finished, I've a ready mixed one coat render in bags, would this be OK to use? I read somewhere you add fibres? I've still a bag of fibres here from the homebrew stage so wouldn't be problem.

    just can't wait to start the fires, but methodically!

    Also I've read bits and bobs on the best logs for burning, has anyone had any experience with any particular log is better over another?

    Cheers

    Dave

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  • david s
    replied
    I presume you going to penetrate that roof with the flue pipe? You will need a double flue to ensure the inner pipe is well away from any flammable material.

    Also cultivate good relations with your neighbour as smoke issues and their resulting complaints have killed some WFO enthusiasts passions. All new ovens are pretty smoky until they're properly dry.

    It's looking great.

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  • Daveholdn
    replied
    Pizza cover done, time for the curing fires starting tomorrow once the flue is extended above the roof Click image for larger version

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  • Daveholdn
    replied
    sergetania cheers, aye not too far off, just put up the pizza cover so going to start the 7 days of fires as suggested by david s in his previous posts. I've read your posts and the build looks amazing, did you render straight after the curing fires?

    Leave a comment:


  • Daveholdn
    replied
    Kris S the opening is 43cm which then drops to 40cm with the lip for the door.

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  • sergetania
    replied
    Looking great! Not that far from pizza time!

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  • Kris S
    replied
    Looking good!

    I was just wondering what size is your oven opening?

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  • Daveholdn
    replied
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ID:	437146 Also completed the polished arch (adding rebar, a few bits of SS needles and a bit more cement strengthened it) completed the vermiculite layer and rendered the stand. Click image for larger version

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  • Daveholdn
    replied
    So I'm back after a long winter and crazy work time, I inspected the oven over the winter and it's held well but had been kept well covered. I've now added the ceramic blanket and covered in chicken wire. Click image for larger version

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  • Gulf
    replied
    I'm curious how you created the coloured marbling effect in the concrete. It looks really effective.
    Thank you very much. Note that the form is upside down. I mixed 3 colors of concrete pressing them in to the form randomly. I placed a small ridge of loose black sand into all borders before adding the next color. (The trial run in the first pic is looks a little thick) I just wanted to create a very slight void between the colors at the very surface. The last pic is after the piece has been removed from the form and cleaned. Most of the loose black sand has been removed from the borders creating thin tapered voids. These voids along with all the other purpose made and natural occurring voids are later filled with a charcoal colored slurry before polishing.

    I hope that I am not hijacking the thread but, the middle pic does show ladder wire reinforcement....... and my beautiful helper..... She is almost as tall as me nowadays


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  • bamforp
    replied
    Originally posted by Gulf View Post
    +1 on the reinforcement. I think that you really need it. I'm not sure if the aggregate was the problem. But, for a reverse concrete form you can make the bottom of the form the front. Placing already smooth surfaces toward the bottom will make polishing the face much easier. I broke and used the smooth side of some already broken colored glass panels that I got free from a glass company. I placed (glued) them in the form where wanted. With that you can use what ever type conrcete and aggregate you want for strength.




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    I'm curious how you created the coloured marbling effect in the concrete. It looks really effective.

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  • david s
    replied
    Originally posted by Daveholdn View Post
    Ah gutted, even left my arch for a couple of days longer just in case. I think the problem is I used my decorative glass as my gravel for the mix, it's really smooth stuff so I don't think it binded. My mix was 1 cement:2sand:3gravel(decorative aggregate). Has anyone had anything like this, or should I have put rebar through it?
    Cheers again.

    ​​​​@david s, thanks for the flue advice there, it does rota Click image for larger version

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ID:	428611 te so all good to go, just gotta get this arch sorted first
    That’s a pity. 3:2:1 not all that strong, especially for a tin casting, add a bit more cement or some thin (5 mm) steel bar and some AR glass fibres.
    Also wrap the casting up for a week to damp cure.
    you only need the fancy aggregate in the surface you are polishing. Also the aggregate size should not exceed 1/3 of the casting thickness.

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