Hi everyone, i am new to this site, and hope someone can help me. i am doing a tile install in a ford dealership. i am going over a concrete slab, and on top of that is terrazo. there are expansion joints between the columns, and the owner doesn't like the fact that i am breaking my tile to accomodate the expansion joints. i am going over the terazzo which followed the expansion joints in the concrete. ultra flex was brought up by the gc, but i thought that was more of a water proofing, which was sanded. can that be used as a thin set also, and go over the expansion joints and protect my warranty, they will be driving cars on my floor, so i am skeptical.the owner doesn't want cuts for the expansion.