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Old 09-05-2009, 07:04 AM
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Pete VanderLaan Pete VanderLaan is offline
The Old Gaffer
 
Join Date: Apr 2002
Location: Chocorua New Hampshire
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I do think that the floor of the furnace never gets the attention it deserves. First, its walls are the foundation upon which you will build a heavy thing and secondly that glass is the universal solvent and will eat through pretty much anything you stick down there short of rammable coarse grog clays. I don't think a 60% alumina castabe will last that long down there. Kastolite 30 will simply be dissolved wherever glass gets to it. So will IFB. Once you have a glasscrete down there you will have no insulation. The walls have 8 inches of fibre, the crown 10. Consider the floor if you want to look at heat loss.
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