Yes, that is correct. The TCA handbook only covers ceramic tile. Natural stone installation methods are published by the Marble Institute of America. They claim to be the leading authority.
Here is their contact info:
www.marble-institute.com/Phone: 440-250-9222
Michael Prachniak - Expert Tile and Stone Consultant and Writer, Owner - Tile Productions
Check out FAF''s tile section!
www.findanyfloor.com/tile/TileFloo...