I am new to the site and have recently downloaded Pompeii oven plans. It is going to be a hybrid installation due to budget constraints. The base is complete and i have poured the perlite concrete which brings me to some questions. Can i use 1/4 inch hardibacker on top of the perlite concrete to set the firebrick on i already have two 3x5 sheets left over from another project? My second question is for a 36" interior diameter oven how much refractory mortar will i need approximately, i have to travel 100 miles to pick it up and don't want to have to make a second trip? Third i am using regular 4x4x9 old clay bricks for the walls, what should i use over these for insulation, fire clay, portland, perlite mixture?
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Pompeii oven installation