Should you insulate under a swimming pool?
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]