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Insulation Base Strength - Forno Bravo Forum: The Wood-Fired Oven Community

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  • Insulation Base Strength

    Hey guys,

    I'm making some progress on my build and wanted to get some thoughts on the plan for my base/bench for the oven, which is as follows:

    - Thick galvanised, reinforced steel for the bench
    - Hebel PowerPanels (aerated cement sheeting) as the bench top
    - 6:1 Perlite Cement mixture for the insulating floor at 10 cm width, with steel reinforcement in the middle, sitting on top of the Hebel. No reinforcement planned for the floor to secure to the hebel, other than the weight of the oven.
    - Fire bricks on the insulating floor

    A couple of questions which I haven't seen answered in previous threads:

    - I've gotten the idea to use the perlite cement mixture as the insulating floor instead of calcium silicate boards as I've heard that this mixture should insulate just as well at a cheaper cost (provided the perlite concrete is thick enough). My question here is, I've seen this used as an alternative when people are using domes made of a perlite cement mixture too, which is relatively light. I have a castable dome which weighs close to 200kg. Would a 10cm thick perlite cement floor at 6:1 ratio be strong enough to support the weight of my dome, or will the floor eventually crumble under the stress of the weight?

    - Should I be using a mortar to bond the dome onto the bricks and the bricks onto the insulating floor, or will a cement/ fine perlite mixture suffice?
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