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cracking in hearth slab - Forno Bravo Forum: The Wood-Fired Oven Community



Photo Galleries are back! Instructions below.

Dear forum users,
Thank you for your patience with the Photo galleries. We've got your galleries online!
We have finished writing a custom script to migrate the PhotoPlog to vBulletin5’s albums.

Unfortunately V-Bulletin killed the "Photoplogs" in their software upgrade which was unforeseen and we're the first development group to have written a script for getting the galleries back... that said, it took some time to reverse engineer the code and get the albums to move over seamlessly!

Forum users will be able to access their “PhotoPlog” images through their user profile page by clicking on the “Media” tab.
They will also be able to browse other albums by going to the albums page. (On the forum site, there is a link in the black bar beside “Forums” to the albums.)

In order for users to create an album please follow the steps below.
1) Go to user profile page and click “Media”
2) Click Add Photos
3) Enter Photo Gallery Title in the first field
4) Click Upload or Select from Photo Album to add photos
5) Click Post
6) Once posted, the album will be created as a “Topic” on the albums page for the public to see. The topic title will be the “Photo Gallery Title” they created before uploading their photos.

To create this migration path we used vBulletin5’s default album structure. Unfortunately, it won’t work like the “PhotoPlog” but is an album/gallery component on the forum now.
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cracking in hearth slab

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  • cracking in hearth slab

    After running the oven for a few days, today up to 400C, some hairline cracks developed at the edges of the hearth slab at the middle of each side. So, four small cracks, one on each side. Has anyone had this happen?

    It seems to be due to expansion of the centre of the slab directly beneath the oven relative to the cooler edges. These cracks are not a worry but probably could have been prevented by placing additional reinforcement along each edge of the slab.

    The oven is sitting at 300C at the moment and the underside of the slab shows 60C. Is this high? Are we getting too much heat leakage through the 50mm CaSi and 40mm perlite insulation?


  • #2
    Only time is going to reveal the significance of the cracks...

    In my view, the significance of your cracks is likely very small. The cracks could be serious if; 1) You didn't use a good recipe for the concrete, 2) Didn't cure the concrete properly, or, 3) didn't use proper steel reinforcement. The plans are designed to support more weight than your oven, so, you can make several variances to the plans and still have adequate support.
    Lee B.
    DFW area, Texas, USA

    If you are thinking about building a brick oven, my advice is Here.
    Our One Meter Pompeii Oven album is here.
    An album showing our Thermal Breaks is Here.

    I try to learn from my mistakes, and from yours when you give me a heads up.


    • #3
      Re: cracking in hearth slab

      60C is pretty high. Sounds like a wet oven to me. A bit too late to back off with the fire now. Keep firing it will fire better and the bottom of the slab will be cooler as you drive out the moisture. The water under the floor is about the hardest to eliminate.
      Kindled with zeal and fired with passion.