1. Marble in a floor must be set in a full bed of nonstaining cement mortar, the proportion of cement to sand to be one to two, and tamped to a uniform bearing true to line.
2. All stone must be tamped to a uniform bearing true to line and set on an even bed of mortar. Lug sills and similar work exposed to uneven pressure must be bedded only at the ends.
3. Mortar joints must be of uniform thickness not more than three-sixteenths of an inch and must be raked out to a depth of three-quarters of an inch as the work progresses.
Nev. Admin. Code § 452.080
Bd. of Health, part Mausoleum Reg., eff. 7-5-32