web analytics
hearth slab - Forno Bravo Forum: The Wood-Fired Oven Community

Announcement

Collapse

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.
See more
See less

hearth slab

Collapse
X
  • Filter
  • Time
  • Show
Clear All
new posts

  • hearth slab

    Hopefully someone can answer this, I'm building a bread baking oven that will be in daily use(Sunday excepted), a cross-section of the hearth will be as follows: 4" firebrick.4" thermal concrete reinforced 8" vermiculite mortar. Is this enough insulation and secondly should the vermiculite mortar layer given its thickness also be reinforced with a rebar matrix.

    David

  • #2
    Re: hearth slab

    Hi David,

    I can answer this question! Yes I think it is enough insulation under the hearth.

    My build is a bit of a hybrid, but my hearth is similar:
    115 mm of firebrick (about 4 1/2")
    100mm (4") reinforced concrete (as a "floating" slab, so separated from the surrounding base structure)
    150mm (6") Vermicrete insulation underneath.

    A link to my build: http://www.fornobravo.com/forum/f21/...ula-20323.html

    Admittedly I have only cooked in my oven twice, but on both occasions I had the internal temp up around 500C at the dome and under the Vermicrete it was mildly warm at best (OK to leave my hand there as long as I liked). My dome has no extra thermal mass but is well insulated, and the next day after firing the internal temp is still around 250C.

    I didn't put any reinforcing through the Vermicrete layer, and it didn't need it. I put a few large screws between the vermicrete and concrete layers, and I also put a few short pieces of rebar (3-4") from the sides of the Vermicrete into the blocks of the stand before I core filled them. I was a bit worried about the weight of the Vermicrete layer being held by those crews only. I'm still not sure if this was overkill but it didn't hurt. I think to put rebar all the way through the Vermicrete might detract from its insulating properties?

    Having said all that, I think there are probably better ways to insulate under the hearth slab. On my next build () I think I will investigate polystyrene blocks (eg Foamex) for under the concrete hearth slab. Surely these would be easier to fit and better insulators?

    Hope that helps.

    Andrew

    Comment

    Working...
    X