We've been back and forth on the type of pool we can do here. After careful consideration I think my dream of a IG is not going to happen with water levels and flooding. So like you guys I plan to do an AG on a concrete pad. I hate sinking that kind of money into a AG but it's the best option and I don't want it to be a temp pool, I want it to last. Round here that means putting it on concrete. Otherwise critters will just tunnel under and ruin your foundation floor. Keeping the pool level with our heavy rains won't be a worry either. We don't have a lot of rocks here so that part isn't a problem but the creek out back could be.
Glad to see I'm not the only one with the concrete pad idea and that it works. If we ever decide to do away with the pool it can be turned into a huge patio with a hot tub or something so no worries there. No idea what it will cost since it will be a very large pad, will probably do a 30' round or a 20x40 rectangle pool but it will still be way cheaper than a IG would have run us. If we could even find anyone to put a IG in, living rural we don't have any local pool builders, have only found one dealer that will come this far down and they are above ground only. No one I know has a IG pool.
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Oh I figure we'll use foam on the concrete and then a cover so the floor will have some padding.