Blue Stone over covered concrete porch-2 years old
What mortar should I use to do a fat bed- S or N or portland - sand mix? I want to adjust for various thicknesses of the dimensional blue stone. Should I wash the back of each stone before laying it? What acid wash should I use for the concrete porch before laying stone? Should I put an additive in entire mud batch or just in the mud to butter the backs and the concrete porch prior to setting each stone.
Thanks for any help.