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Questions on new build - Forno Bravo Forum: The Wood-Fired Oven Community

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  • Questions on new build

    Iíve laid down the insulation layer using Perlite mixed around 5:1. It took quite a few days to start to set, now itís been a few weeks it seems pretty solid, lots of air pockets I didnít count on while laying, basically was a bit hesitant to push down too hard in order to avoid the stuff breaking up too much but maybe the air pockets will insulate anyway.

    Iím off to get the fire bricks, theyíre 230mm x 110mm x 75mm, the 110 worries me a bit, should be 115mm hope it wonít throw out my layout, also says he supplies glue instead of high heat concrete, says it doesnít crack under heat. My sister had one installed and they used glue too but it was one of those pre cast kits imported from Italy.

    Iíve allowed dome thickness of 250mm being 110mm fire brick, 50mm blanket and 200mm brick render.

    Made my IT and used it to scribe out the base template, internal diameter is 1060mm (round 42Ē).

    Having trouble uploading photos at the moment, keep getting upload failed. Maybe images are too big ?

  • #2
    I've bought my supplies from Claypave in Old, appears Allan there has his own ideas on materials so I came away with some 450 x 300 x 50mm refractory slabs for the floor as you can see in the image I uploaded, big advantage is there won't be many cracks to impede the surface but I am concerned that it may not have enough thermal mass.

    I also bought a bucket of Rylbond, it's a pre-mixed air set mortar to glue any face to face material, I was advised to stick down the slabs so they can't move sideways and potentially crack the oven walls.

    I feel like taking the slabs back and swapping them for firebricks, then the question is has anyone used brick sand (the yellow sand) to mix with fireclay for the hearth bed or should I use washed river sand ?

    I'd welcome any feedback on this from forum members.
    Last edited by Gretsch; 10-11-2017, 06:58 PM.

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    • #3
      there is no adhesive that will resist thermal expansion. so fine sand clay mix is fine I used the Rylbond on my dome with 1 to 2 mm joints and it worked well max joint is about 3 mm so tight joints are essentialI do not think there is any issue using the tiles for the floor it used bricks but believe the hearth insulation matters more

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      • #4
        Originally posted by Gretsch View Post
        I've bought my supplies from Claypave in Old, appears Allan there has his own ideas on materials so I came away with some 450 x 300 x 50mm refractory slabs for the floor as you can see in the image I uploaded, big advantage is there won't be many cracks to impede the surface but I am concerned that it may not have enough thermal mass.

        I also bought a bucket of Rylbond, it's a pre-mixed air set mortar to glue any face to face material, I was advised to stick down the slabs so they can't move sideways and potentially crack the oven walls.

        I feel like taking the slabs back and swapping them for firebricks, then the question is has anyone used brick sand (the yellow sand) to mix with fireclay for the hearth bed or should I use washed river sand ?

        I'd welcome any feedback on this from forum members.
        50 mm thick floor is fine and what most cast oven manufacturers use. Most oven manufacturers recommend the floor bricks or tiles be laid loose so that they can expand freely and individually as the bricks in the centre of the floor are going to get hotter and therefore expand more than the bricks at the perimeter. The larger the pieces are the more likely they are to crack. If laid loose any replacement required is simple. The sand/clay mix is just used as a leveller. Any type of sand will be ok but fine sand presents fewer problems if used as a leveller. If glued down it is far more difficult to replace a brick or floor tile. . Any gaps will fill with ash. Your choice but if it were me Iíí'd be laying them loose. Everyone has their opinion, you could ask Alan how many ovens heís built and fired.
        Last edited by david s; 10-12-2017, 07:40 PM.
        Kindled with zeal and fired with passion.

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        • #5
          I doubt Allan has built any ovens. He sells a small-ish barrel style pizza oven kit but has no idea on the pompeii design, he reckons the chimney goes inside the dome so there ya go.

          Don't get me wrong he's a good bloke and has done me a good deal, so long as the floor will hold enough heat to cook everything I want (pizzas, ciabatta and roasts) I'll feel ok with the tiles and loose fit them. At least if one cracks I can replace it. It's going to be a bit of a job cutting the curved sides thou, I want this oven to be as good as I can make it.

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          • #6
            Curved cuts are easy enough with a 5" angle grinder fitted with a diamond blade.
            Kindled with zeal and fired with passion.

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