Jim,
I'm laying an extra layer of refractory mass before I install the insulation, Not sure that it's even necessary but I already started. The dome itself will be enclosed in a brick structure & never seen again. (I hope).
I worry about the cracks from a functional aspect, e.g. what will happen if they expand & cause the stucco to loosen in big chunks?
I intend to cover with a 2" insulfrax blanket & then Vermiculite, is this enough to stop any chunks dislodging & compressing the insulation?
As you can see I worry a lot.
Thanks
Balty