I'm considering facing my island with Cultured Stone. It's framed with metal studs and enclosed with 1/2 inch HardiBacker. Is it necessary to use the weatherproofing; metal lath and scratch coat of mortar; or can I go directly onto the Hardibacker with construction adhesive. I'm planning on using Southern Ledgestone with a dry stack appearance (no mortar joints between the stone). My main concern with the installation process recommended by Corning is the overall thickness. They talk about 1/2 to 3/4 inch of scrath coat plus another 1/2 inch of mortar on the stone. That plus the stone thickness will increase the overall demensions of my "L" shaped island and require a significant overhang on the countertop to marry the tile with the edge of the stone.
Opinions or experience with Cultured Stone installations would be appreciated.