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Castable Refractory Insulation - Forno Bravo Forum: The Wood-Fired Oven Community



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Castable Refractory Insulation

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  • Castable Refractory Insulation

    Hi Everyone,

    Today I came across a Harbison-Walker castable refractory insulation, Greenlite 45L. It comes in a 55lb bag is listed on eBay for around $38. The link to it's
    thermal characteristics is:

    GREENLITE-45-L PLUS 55# BAG - 10023

    I'm about to pour my foundation and support stands for a 42" Pompeii shortly and I wonder if anyone has used this kind of product to insulate under the oven floor?



  • #2
    Re: Castable Refractory Insulation

    The linked site shows the product at 72 pounds per cubic foot, so you would need a lot of bags. You're going to need a bag for every two square feet if you're pouring a four inch layer. If it were me, and it was a cost-no-object situation, I'd go with the insulation boards. And, if you're mixing the stuff up anyway, why not use the proven vermiculite/perlite solution and save a bunch of cash?
    My geodesic oven project: part 1, part 2


    • #3
      Re: Castable Refractory Insulation


      Looking at the numbers, you're absolutely correct: This stuff IS expensive. I'll go with the vermiculite. Thanks!