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



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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!