web analytics
Perlite or Vermiculite insulation ? - Forno Bravo Forum: The Wood-Fired Oven Community

Announcement

Collapse
1 of 2 < >

New Forno Bravo Forum Feature

Forno Bravo Forum Community,

You will notice a new forum at the top of the main page called, "Ask Me Anything". This forum will be used for live one hour "Ask Me Anything" (AMA) sessions hosted by people who are knowledgeable in different areas pertaining to wood fired ovens. How it works:
- Each AMA will have a "sticky" thread where the community can post questions they would like answered during the live session. This will allow everyone to participate even if you can't be online for the live session. These questions will not be answered by the host until the live AMA; if you need an answer quickly, you should post it in the appropriate Forum area for the community to respond.
- Another thread will be posted for the live AMA. Registered users who are logged in during the live session can interact with the host by asking questions and receiving responses.
- The live thread will remain in the AMA forum to view after the session.

To kick off our AMA feature, we have invited author, chef and master bread maker and host of Pizza Quest, Peter Reinhart, to be our first host! Peter will be in the Forum on Monday, February 15th, from 7:00 - 8:00 pm EST. If you are unable to be online during the live session, you can post your questions in the sticky post. Peter will answer those questions during the live session on February 15th. You can view Peter's answers to your questions as well as what happened during the live session in the session thread.

We hope you enjoy this new feature! Please let us know if there is a topic that you'd like to have as an AMA and we'll look for a host!

Forno Bravo
2 of 2 < >

Dome Installation Video - Casa / Premio / Modena

Hello,

For many of you who bought a modular oven, you may have asked how we put the domes together when we build them. For those of you considering one of our ovens, we shot a video to make your install easier.

Check it out on our You Tube Channel.

https://www.youtube.com/watch?v=-7q7...jSniYogfUra06Q

If the link doesn't work, simply go to You Tube and type Forno Bravo Channel. The video title is How to Set your Forno Bravo Oven Dome Pieces.

Thanks for participating in our Forum. We will have more video content available soon.
See more
See less

Perlite or Vermiculite insulation ?

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

  • Perlite or Vermiculite insulation ?

    I am currently waiting for the oven cladding to dry. Its about 5" thick in most places, a little thicker round the top. I am not sure if I should now add Vermiculite insulation, mixed in 6:1 with Portland cement, or loose Perlite.
    I have both available, they cost exactly the same per bag, and I could use loose or a cement mixture, since I already build a outside wall, and now have a gap of about 4-5" between outside wall and oven cladding.
    Any pros or cons of either. What insulates better ?
    Thanks for any suggestions.

    Christian

  • #2
    Re: Perlite or Vermiculite insulation ?

    I was talking to the owner of a refractory business today, and I mentioned the use of vermiculite or perlite. He was quite emphatic that perlite wouldn't perform as well as the vermiculite, but I didn't think to ask him why.

    Steve

    Comment


    • #3
      Re: Perlite or Vermiculite insulation ?

      try this page:

      SCHUNDLER COMPANY--Perlite Block and Cavity Fill--Superior to EPS Inserts and Beads

      PERLITE VS VERMICULITE

      Tests peformed by Dynatherm Engineering reveal that perlite is 6% more eflective as a core fill insulation than vermiculite. Although the physical characteristics of the two materials are similar, the closed cell structure and lower thermal conductivity of perlite account for perlite's superiority.
      it's probably a bit biased

      but if you'd like to buy the actual Journal of the Test, it can be found here:
      http://jen.sagepub.com/cgi/content/abstract/9/3/187
      Last edited by Mitchamus; 11-09-2009, 03:04 PM.
      -------------------------------------------
      My 2nd Build:
      Is here

      Comment


      • #4
        Re: Perlite or Vermiculite insulation ?

        I used 6 perlite (coarse grained) + 6 vermiculite + 1 portland.

        I found that the perlite made the vermiculite mix more "workable".

        A 12:1 mix has more insulation value than a 6:1 mix and is more than strong enough for the layer over the dome. (I used the 6:1 ratio for the insulation layer between the suspended slab and the hearth bricks.)

        If you have containment, you can also add it loose of course. If using loose material, I would use straight vermiculite - the particles are larger and less likely to "leak" out of any small joints.
        Last edited by Neil2; 11-09-2009, 03:24 PM.

        Comment


        • #5
          Re: Perlite or Vermiculite insulation ?

          Originally posted by Neil2 View Post
          A 12:1 mix has more insulation value than a 6:1 mix and is more that strong enough for the layer over the dome.
          Definitely.
          If you going for an enclosure around your dome - loose fill is the way to go.
          -------------------------------------------
          My 2nd Build:
          Is here

          Comment


          • #6
            Re: Perlite or Vermiculite insulation ?

            Practical experience has shown that the two are interchangeable. I just chose what was affordable (perlite), as I put a lot on top of my oven, as well as behind surrounding the firebox of my fireplace.
            My geodesic oven project: part 1, part 2

            Comment


            • #7
              Re: Perlite or Vermiculite insulation ?

              Thanks guys, I guess I`ll try to loose fill it with Vermiculite then. I will let it dry for a total of 3 weeks, and then try a big fire and see how long I have to heat it to feel heat on the outside of the cladding, so I know how long it takes to fully heat the oven.
              I already had a fire just for the firebrick and arches, before I poured the cladding. I saw some smoke creeping through some tiny cracks, and closed those with clay before I added the cladding layer. So that first part is all dry already.

              Comment

              Working...
              X