I am wondering what kind of range for joint thickness you can get a way with when using the home brew mix of Portland, Sand, Lime and Fireclay.

Does one worry about using coarser sand in the mix for thicker mortar joints?

I have not used the home brew before but leaning in this direction for my next oven. Back to the mesh of sand, is there a recommended mesh to go with for gaps ranging from 1/16? to say one inch for some of the tapered joints in the dome?

Also when I am shopping for the lime, is there anything specific I should be asking for, or is all lime the same.

Thanks Wayne