24x24 that weighs 22 lbs? Ok. What did you charge for the 20x20? It's not that much of a difference. Push for a larger grout joint, 3/16 to 1/4. 1/2" trowel and flatten the floor as best you can. If that means thinset to level then so be it.....
It really isn't much different. Charge a little more than you would on the 18 or 20 and go for it Travis.
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Does one use a good large format thinset and install the same way that they would for 18x18
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There you go.