how is this sauna insulated, what type and how thick, does the insulation get wet ever also could you use a far infrared heater in an outdoor sauna

The outdoor sauna walls are insulated with pink foam board panels. The insulation should not get wet, but if it did, it will still retain its insulation properties. Far Infrared does not perform well in colder ambient temperatures. It is possible to make a sauna with both a traditional heater and infrared heaters. We can custom quote that for you.