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since this floor is so big and the expense to do this is so great i would like for you to consider doing a matt test on this floor to check for moisture.What you will need to do this is some 6 mil plastic and duct tape.Cut the plastic into 1' x1' foot square,you will need 4 of them spread them out over the floor in different areas and using the duct tape tape them to the floor sealing all the edges and let them sit for 24 hours then check under them for signs of moisture,you may suprised at what you see!If you choose not to do that then lets go on to the next step.
See if you can string a line from one end of the floor to the other and attach appr.1" from the floor and then measure along that line to see if there are any variations in that line and that will give you an idea of what the rest of the floor may be like.
You also want to go over this floor closly and chaeck for things like oil spills,dirt, dust,any spider like cracks or saw cuts,the reason i keep brining up the crack issue is they would need to be isolated so they don't crack the tile over it.
Some other things to consider;Trowel size,for the bigger tile you want a 1/2 by 1/2 notch trowel to get the coverage you need.Most of the bigger format tile have a concave back to them to add support to the tile so you need to fill that somehow and that will help.Get you a good latex modified thinset to get a good bond with thile and the cement.
Before you commit get back to us and we'll get a little more indepth and answer any more questions you may have[8D]
Floorman
floorlayers union local 1310
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