Can a humid space like a sauna cause damage to my house?

Release time:May 13,2026

This is a common myth about sauna. A sauna, well-designed and properly used, will not cause any damage to your home. Even in saunas where users like a lot of steam, the sauna will still be a relatively dry place when compared to normal household humidity levels. If you use no water on the rocks, the humidity level can be less than 10%. A typical Finnish sauna humidity level, with a fair amount of water put on the rocks, is 25-35%. For those having the newer-style heaters with massive amounts of rocks-and lower air temperatures-the humidity level can reach more than 50%. The adjacent shower will typically add more humidity to the sauna area than the humidity added by the sauna itself. Your sauna manufacturer will most likely recommend having a bathroom-style exhaust fan in the area near the sauna and shower.