Has anyone insulated under a swimming pool?

Randy Parent
Updated: May 14, 2021

18' swimming pool, Northern Wisconsin, I can see Lake Superior from here, north. I would like to put 2" rigid foam boards under 6-7000 gallons of water to keep the ground from sucking the heat out of the pool. Haven't  found anyone that has done this, would  rigid foam be stable enough to take the down pressure/weight of the water? which product should I use? life expectedancecy? signed [email protected] 

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