Indoor pool walls – ICF – GreenBuildingAdvisor

Concrete doesn’t care about moisture and the layer of rigid on the inside will keep moisture from reaching it. The only thing you have to watch is any interior covering needs to be vapor open.

This is just me thinking out laud but I really don’t see any issues with it for a pool.

The SIP roof is a bad idea, for the roof, I would look at regular stud framing with a vapor barrier over the roof deck and exterior rigid insulation only above it. Again, only vapor permeable finishes on the inside*.

With ICF, the one spot you would have to watch is around windows where the concrete core is exposed. Probably best there to build window bucks out of something like R6 or R9 ZIP R and install the windows to the bucks.

* you can also build the walls exactly the same way and they will work great if you don’t want to go ICF. This is a good read about pools:

https://buildingscience.com/documents/insights/bsi-055-in-the-deep-end