I bought an Intex 9x18x52 retangle pool. I plan on setting it up on a concrete pad that is 14.8 x 22. The concrete pad is smooth and i planned on putting 6 Mil polly under the pool to protect the bottom from abrasion. My question is should I add a 1/2 green poly foam board under the entire pool to give more protection and add some cushion for everyones feet? Lowes has a tongue and groove foam board that I will tape together before installion. Just want some input from everyone before I sink $100 into foam board.