The installation of walls from gas blocks will not require much effort, they fit into glue so that there are no cold bridges in the seams. They are also frost -resistant and can resist humidity. Well sealed walls will not accept all the moisture of the steam room. If desired, the internal walls can be finished with lining, not forgetting to leave the gaps between the walls and a 10 mm finishing material, which will provide additional ventilation. The lining for the bath is aesthetic, but will not serve as waterproofing, so do not forget about the additional protection of aerated concrete from moisture.