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roof materials - Forno Bravo Forum: The Wood-Fired Oven Community



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!

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  • roof materials

    i am on the home stretch with my oven - brickwork is done, dome is insulated, and all framing is done (walls and roof). i used metal studs for all of the framing. i will make the walls out of cement board, and cover them in stucco. my question is about the roof - i have been trying to avoid combustible materials at all cost, but i am at loss for the roof - if i use cement board, there will be nothing to nail shingles into. my local lumber yard sells some type of fire-retardant plywood (i guess treated with some chemical), so i was thinking of using that, then tradition roof construction - tar paper, shingles.

    i am sure the concern unnecessary - i have 2-4" of insulating blanket, and intend to fill the remainder of the chamber with vermiculite, but it is worth a slight consideration just to be safe.

    any ideas for this? thanks!

  • #2
    Re: roof materials

    Even what we think of as masonry roofing materials, the tiles and the slates, are nailed to wood furring strips supported by wooden rafters. With that much insulation I can't imagine it's even going to get warm, unless you do something dumb like vent with single wall stove pipe.
    My geodesic oven project: part 1, part 2


    • #3
      Re: roof materials

      I used a rubber EPDM membrane on top of cement backer board. The cement backer board was screwed to metal studs.. Used contact adhesive to glue membrane to backerboard.

      Little over 1 year - So far so good!

      My oven progress -


      • #4
        Re: roof materials

        On my Scott oven I used brick walls with conventional wood frame roof plywood deck asphalt shingles loose fill vermiculite. Cedar planks on the roof ends and eaves. I used double wall stainless 8" chimney pipe from Lowes topped with a spark arresting vent top.
        The system has never showed signs of excess heat or of the flamable items trying to ignite.

        The I've is 30' from my house so I am not concerned with a fire threatening a dwelling.



        • #5
          Re: roof materials

          Originally posted by jlaw View Post
          if i use cement board, there will be nothing to nail shingles into. my local lumber yard sells some type of fire-retardant plywood (i guess treated with some chemical), so i was thinking of using that, then tradition roof construction - tar paper, shingles.
          Other option would be to forget nailing. Just use the screws designed for cement board to screw your shingles to the cement board roof. It'll take a little longer than nailing and just slightly more expensive than nails, but you won't need a whole lot for a small roof. You won't need tar paper if you use the Hardee board...its already moisture resistent.
          Paradise is where you make it.


          • #6
            Re: roof materials

            yes, but screwing INTO cement board would be very weak, as the board is very crumbly. that is very different than screwing cement board into metal studs, where the head of the screw is essentially what is holding against the cement board (NOT threads)...


            • #7
              Re: roof materials

              I've had my oven up to 1,000 degress F, and I can promise you that if you inlcude an inulating blanket, along with additional vermiculite filling your enclosure to the rim- you won't feel any heat on the ouside roof or walls. It really does all stay inside. I wouldn't hesitate to tack some wood strips to the outside. No problem at all. (again, this is assuming you have insulated correctly).
              Check out my oven progress here: http://www.fornobravo.com/forum/phot...dex.php?u=4147

              See ALL of my pictures here:


              • #8
                Re: roof materials

                Put concrete board first top with 1/2" plywood or OSB attach shingles with pro-fit or similar screws (they will self drill into the cement board nails may damage it).

                The fasteners work mostly in shear to keep the shingles from sliding of the roof one of the most important parts of the system is the tar strip adhessive between the shingles themselves. I believe it is worth it to use tar paper, drip edge, chimney flashing etc. This is not the place to save $50.00 on a 1500.00+ project with who knows how many hours of labor. For performance and longevity KEEP YOUR OVEN DRY.

                Lowes and HD have roofing books.