Jim,   That will slow the erosion down... not stop it. Good choice to use board over blanket.   best,   .......john     Glad you commented, John. Now, that I hooked you with that, do you think thicker ceramic board would work for a floor? I've used kaowool years ago when I built kilns in Colorado, but have never used board. It comes it several thicknesses. I'm thinking same kind of panel mentioned above only thicker for floor directly over cinder blocks.   Thanks, Jim