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Roof questions - Forno Bravo Forum: The Wood-Fired Oven Community



I'm Peter Reinhart! Ask Me Anything! Monday, February 15, 2016 7:00-8:00 pm EST

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.

Ask Me Anything New Forum Feature

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.

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 questions

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  • Roof questions

    I have a question about the roof over a pompeii style oven

    I have built a dome and intend to build a "house" around it. When I get to the roof, which I intend to tile, should I use felt under the tiles?

    I am concerned that even though there will be a lot of vermiculite insulation over the dome, the heat might be too much for the felt.

    Any input welcome.

    Also see my thread in barter/trade for fire bricks in southern UK.


  • #2
    Re: Roof questions

    If you are using ceramic blankets and loose vericulite over, then you have nothing to worry about. I have three layers of insulation and a wood roof, no problems.

    If you are using vermiculite concrete alone, then it would be a good idea to add another layer, either ceramic blanket of loose fill vermiculite.
    Wade Lively


    • #3
      Re: Roof questions

      I have put a single layer of superwool blanket over my bricks and then 3" vermiculitr cement over that and topped it off with a 1/2" render finish.
      When my oven is cooking at 500˚C, the outside top of the Ponpeii dome is barely warm
      You should have no worries at all.
      Can you answer me what is the reason that you wish to put felt (and I'm assuming that is similar to carpet underlay felt rather than the quite expensive other dressing, polishing, hard felt) under your roofing tiles?
      Are you intending to use terracotta, cement or pressed metal tiles?

      If you don't succeed the first time, try again and again until you get it right!


      • #4
        Re: Roof questions

        Building felt, in the US, is the term of art for what we would call tarpaper. Nothing like the wool fabric. It's pretty standard under all types of roofing, and before the new building wraps came in, it was used under siding and cedar shingles as well.
        My geodesic oven project: part 1, part 2


        • #5
          Re: Roof questions

          Thanks Dmun,
          we have a similar material that is used as a reflective aluminium foil covered tar paper insulation membrane. I have never heard it called felt before. My home addition has it on the cavity side of the timber veneer walls and under the cement roofing tiles.
          It is now coloured light blue to cut down on reflections and blinding the installers and workers in the building trades.

          If you don't succeed the first time, try again and again until you get it right!


          • #6
            Re: Roof questions

            The tar was dropped from the recipe 20 odd years ago.......
            The English language was invented by people who couldnt spell.

            My Build.



            • #7
              Re: Roof questions

              Thanks for all the replies.

              I have a firebrick/storage heater brick dome, which I'm covering with about 6" of loose vermiculite.

              I wanted to put the felt/tarpaper under the tiles just to give better weather protection. Partly because I live in the UK - so lots of rain, partly since this will be my first roof tiling of any kind, I'm not too confident. The tiles will be concrete slabs.

              Still - how hard can it be - what could possibly go wrong



              • #8
                Re: Roof questions

                brickie in oz
                My home extensions were completed over 25 years ago, so I guess they had tar in them!
                If you don't succeed the first time, try again and again until you get it right!