Well, I poured my slab!  But didn't put in the insulation!  I have emailed the yahoo group for help too, but thought I might as well post it here and see what other help I can get! :)  I'm going for the Alan Smith vault style oven.  With all I'm reading, I should have put in the insulation before hand!  Ah...my help was here and I didn't get the book in time (the bread builders), and now "what's done is done".  But, can it be fixed?  With my rocks and cement and a fire brick on top I'm at 37 inches high.  Can I put some kind of insulation in the shape of my hearth floor, cover it with cement, and put the fire bricks on top of that?  I probably shouldn't go above 40 inches high.

Any help would be appreciated.  Thanks!  I know it's messed up, don't yell at me too much! :)

Faith