web analytics
need help with dome render cracking - 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

need help with dome render cracking

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

  • need help with dome render cracking

    Hi all i have put on 3 coats of render and have just made beer can chicken
    all went great,exept the cracks running over my dome about 8 in total
    about 3mm wide,i have a coffee cake in there now,as the dome is cooling i can see some of them closing i want to move it out of the shed soon,
    any idea how i can water proof the dome or should i bight the bullet and build a roof over it?.The render{stucco}is about 15/20mm thick amd i fired it with the first coat on hoping to finish the cracking process.
    thanks for any ideas.ps i used comercial acrylic render from bunnings warehouse.
    Peter
    Last edited by toyota08; 10-26-2008, 01:35 AM.

  • #2
    Re: need help with dome render cracking

    I'm doing my firing prior to the render coat, so if there are any cracks in the vermicrete layer, the render will fill them. I'm half way through my firing process and there's only a couple of very fine hairline cracks where the vermicrete meets the refractory castable at the door arch. The render coat will easily fill these. No other cracks anywhere. It's been two weeks since I cast the dome and one week since the vermicrete layer so it's had some time to cure already.
    I'm going to use an external weatherproof acrylic/sand render called "Multitex"(they're in Preston).

    What insulation have you used and how long have you let your oven sit before firing? What was your firing procedure?
    Last edited by Balthazar; 10-26-2008, 04:21 AM.

    Comment


    • #3
      Re: need help with dome render cracking

      Hi mate i hade the oven sit a couple of weeks before firing at that time it had no render
      and for insulation it has 1.5"vermiculite 7-1 then 1/2" ceramic blanket chicken wire then 4" approx vermiculite 7-1.i then slowly fired it over 2 days left it a week did the same thing 4 weekends in a row.I then did the first render layer fired twice to get the cracks then added 2 more colored layers of rendar.I may just grind the cracks larger and cover them with mastic to keep the rain out.
      cheers Peter

      Comment


      • #4
        Re: need help with dome render cracking

        I think you need mesh in the final render shell. I tried using fibre instead of mesh to save time but it didn't work- cracked anyway so I rendered over it with another layer 15mm of render but this time with mesh. No cracks. If using a cement based render you should use lime as well because lime has some elasticity. The brew is 4:1:1 sand /lime/cement. If using an acrylic make sure you use one that is elastic or it will crack too.
        Kindled with zeal and fired with passion.

        Comment


        • #5
          Re: need help with dome render cracking

          Originally posted by david s View Post
          I think you need mesh in the final render shell. I tried using fibre instead of mesh to save time but it didn't work- cracked anyway so I rendered over it with another layer 15mm of render but this time with mesh. No cracks. If using a cement based render you should use lime as well because lime has some elasticity. The brew is 4:1:1 sand /lime/cement. If using an acrylic make sure you use one that is elastic or it will crack too.
          As I mentioned in my previous post, I'm using an acrylic(felixible) render called Multitex: Multitrowel
          Then I'm going to go over that with Wattyl Solaguard Stone Finish or Porter's Limewash which will fill any fine cracks....well that's the plan at least

          Comment


          • #6
            Re: need help with dome render cracking

            Thanks guys i was looking at the Bondall site they have a fine plastic mesh that you lay under thier pondtite flexible membrane i may look into it,i may also cut a expansion joint around the chimney area as some cracks seem to come from this area.
            cheers peter

            Comment


            • #7
              Re: need help with dome render cracking

              If using a cement render you should keep it damp for a week to allow it to achieve max strength. I find that wrapping it in cling wrap works really well. But then allow another week to let it dry out before firing again.
              Kindled with zeal and fired with passion.

              Comment


              • #8
                Re: need help with dome render cracking

                Also, adding some plasticiser and/or lime into the mortar will make it a bit more flexible. Are you rendering with sharp sand or soft sand?
                Matt S, Cambs, UK
                42" Pompeii

                Pizza oven pictures - WIP!

                Pizza oven costs (so far!)

                Comment


                • #9
                  Re: need help with dome render cracking

                  Hi Matt im using a commercial acrylic render but i think the fault is coming from the stainless flange warping on my chimney mount that is causing the cracks mate.
                  cheers Peter

                  Comment


                  • #10
                    Re: need help with dome render cracking

                    Look into lime only mix 3-1 mix we had good results with it and we put it on while the stove was warm.

                    Comment


                    • #11
                      Re: need help with dome render cracking

                      An expanding steel flue can crack the render around it. I use vermicrete around the flue to act as an expansion joint.
                      Kindled with zeal and fired with passion.

                      Comment

                      Working...
                      X