I had a concrete pad poured about 4 years ago under my deck. We are now just starting the pool. I had the deck poured 2inches lower because back then had had the idea of putting pavers or flag stone on top. After pricing it out, I have decide to tear the concrete pad out. Because all the nice pavers cost appx $8 /sg ft and then you have installation on top of that unless you do it yourself. I am getting stamped concrete completely poured for $8 /sq ft. This way all will match-OFFFF COURSE FOR THE WIFE