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Cast concrete chimney vent - 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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Cast concrete chimney vent

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  • Cast concrete chimney vent

    I'm getting towards the end of my build and having had enough of cutting firebricks I've decided to make a cast concrete vent for the chimney connecting plate which will be the male part of the connection.

    This will of course get very hot, so can anyone please tell me what's the best recipe to use for the concrete?

  • #2
    Re: Cast concrete chimney vent

    This will of course get very hot, so can anyone please tell me what's the best recipe to use for the concrete?
    You want to use a castable refractory product for this use, reinforced with stainless steel needles. Regular concrete will spall and crack, and shouldn't be used unless you line it with refractory flue liner, and provide an expansion space between the concrete and the outer chimney.

    Once you get a quote on refractory concrete, you may think twice about cutting more bricks.
    My geodesic oven project: part 1, part 2


    • #3
      Re: Cast concrete chimney vent

      Do a search on KS-4, the castable refractory I used to see comments.

      It was not very expensive and for a vent transition you will need only 1, 55lb bag/bucket. I bought it here;Empire Refractory Specialists Shopping Cart
      Wade Lively


      • #4
        Re: Cast concrete chimney vent

        Portland cement based concrete is susceptible to heat. It will start giving up its strength if it reaches about 650 degrees.

        Successive heating cycles will cause it to deteriorate.


        • #5
          Re: Cast concrete chimney vent

          I would put a liner in the chimney to reduce the heat deterioration.
          Looking for chimney liners in Canada.


          • #6
            Re: Cast concrete chimney vent

            Due to the unique shape of my vent I'm thinking of casting my vent as well.
            I could also use the castable for the shallow landing as well, where it meets the oven floor.


            My 34" WFO build

            Weber 22-OTG / Ugly Drum Smoker / 34" WFO


            • #7
              Re: Cast concrete chimney vent

              check out the link by lcripe just below your post. He did an excellent job of casting a chimney vent transition.