Precision Tile & Stone follows Marble Institute of America guidelines to insure quality installs. Unless a wood framed home was designed for stone flooring, sistering of joists or adding a beam to shorten the span may be required . Also stone requires two layers of plywood an then an isolation or decoupling membrane. Something to keep in mind when planning a budget for stone. Precision Tile and Stone accesses joist structure and sub-floor to be sure deflection is within tolerances to support stone tiles without cracking.