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Styrofoam Form for the vent arch? - Forno Bravo Forum: The Wood-Fired Oven Community

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  • Styrofoam Form for the vent arch?

    If I glue 2 pieces of styrofoam (4 inches thick) to make the template for my door /vent arches would the styrofoam be sturdy enough? I thought it might be easier to do this than using plywood. Plus it would be easier to get the styrofoam out.

    Let me know.

    Thanks
    Dick

  • #2
    Re: Styrofoam Form for the vent arch?

    I would think that should be plenty

    Look here

    http://www.fornobravo.com/forum/f8/3...-pics-348.html

    It looks like the foam is only one inch and help up the dome during construction without a problem.


    Bruce
    Sharpei Diem.....Seize the wrinkle dog

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    • #3
      Re: Styrofoam Form for the vent arch?

      if you feel it is necessary to have a second opinion... the styrofoam will be plenty strong...if you have any apprehension at all, use the blue or pink board, it may have a little more strength. But you will be fine in either case

      Bob
      Great pizza, a cold beer,a great cigar and great friends...my idea of a great time

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      • #4
        Re: Styrofoam Form for the vent arch?

        Don't forget to leave shim space underneath the styrofoam forms. A couple of builders had their arches fall trying to pull the forms out.
        GJBingham
        -----------------------------------
        Everyone makes mistakes. The trick is to make mistakes when nobody is looking.

        -

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        • #5
          Re: Styrofoam Form for the vent arch?

          Originally posted by gjbingham View Post
          Don't forget to leave shim space underneath the styrofoam forms. A couple of builders had their arches fall trying to pull the forms out.
          George, good tip. How long did they wait before pulling out the foam? I should think you can cut it to come out easier.
          sigpicTiempo para guzarlos..... ...enjoy every sandwich!

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          • #6
            Re: Styrofoam Form for the vent arch?

            So it sounds like the styrofoam will be strong enough to support my entry arches . I just didn't want to build it and have the arch "shift" while it was drying.

            I agree. My plan was to cut them out.

            TIP: I used an old "electic turkey carver" (actually a new one that we got as a wedding present 8 years ago but never used it ) with the two blades to cut the styrofoam.

            Thanks
            Dick

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            • #7
              Re: Styrofoam Form for the vent arch?

              Heavy duty plastic sheet works well for a shim over your formwork. Nothing wants to stick to it and form slides out easily. Also try to create what they call a release. That is a slope like a wedge so the form comes away easily.
              Kindled with zeal and fired with passion.

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              • #8
                Re: Styrofoam Form for the vent arch?

                I used styrofoam boards for my archway - and I had to pull them early because of an accident with the vent pour, and I didn't have wedge thing and had to cut them out with a bread knife...

                But it worked out fine. Wouldn't want to use anything else.
                "Building a Brick oven is the most fun anyone can have by themselves." (Terry Pratchett... slightly amended)

                http://www.fornobravo.com/forum/f8/p...pics-2610.html
                http://www.fornobravo.com/forum/f9/p...nues-2991.html

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                • #9
                  Re: Styrofoam Form for the vent arch?

                  Cutting them out is perfectly acceptable. A couple three shims under the bottom of the form can be easily pulled and the whole thing should come loose.

                  I think the current wisdom on how long to wait before pulling the forms is one week. If your bricks are custom cut with a keystone at the center, and with minimal mortar joints - 4 or 5 days may be safe. Why sweat it though. Give it a week. (I only lasted 6 days before I couldn't wait any more)
                  GJBingham
                  -----------------------------------
                  Everyone makes mistakes. The trick is to make mistakes when nobody is looking.

                  -

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                  • #10
                    Re: Styrofoam Form for the vent arch?

                    I used 1" pink foam board "arches" as my form or support for the vent arch. Plenty strong. Since I went with a cut brick arch, for minimal joints, I pulled the forms soon after getting all the bricks in place together. I wanted to make sure, if by some chance the mortar bond completely failed the arch would still stand. Pulled the supports and the the arch held fine. Great feeling. I should say the sides or wall were set of course.
                    Wade Lively

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                    • #11
                      Re: Styrofoam Form for the vent arch?

                      Good report Wade. I figured that with tight joints well placed bricks, the arch should stand on its own immediately. This is the point though that butressing the entryway walls might help a bunch.
                      GJBingham
                      -----------------------------------
                      Everyone makes mistakes. The trick is to make mistakes when nobody is looking.

                      -

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