One thing about floor tile, even though you are using commercial grade, any heavy weight in one place for a lengthy period of time can make tiles separate, also you have to take in effect, if the slab has any moisture coming thru it, it will blow the tile off the floor, look for any cracks in slab. You can always do a moisture test, using a plastic baggie taped at bottom to floor, then look for any moisture inside bag.
Retired commercial flooring installer for 23 yrs besides my regular retirement.
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