In New York, we've got a lot of modestly-sized 1880's apartment houses -
Dakota vintage, but only 4 or 5 stories, maybe 20-40x100.  The vestibules and
lobbies all had "white" marble pavers with trimwork of black, grey or red
strips.

I've never found a torn-up one to show me how they were put down.  I've never
seen any serious deflection, so I assume they're all put down on a masonry
sub-floor.  But would they have been "mud-set", "thin-set" or dry-laid?

Christopher Gray
Office for Metropolitan History
246 West 80th Street, #8, NYC  10024
212-799-0520  fax -0542
(http://www.killer-ivy-drives-Ralph-crazy.com)