To understand the installation of sauna benches you need to understand hot air. First of all, you already know that hot air rises. That’s why sauna ceilings are low because that’s where the heat is going to go.
Since the temperature difference in a sauna can be as much as one degree for each inch of elevation, proper placement of the benches in a sauna room is very important.
Sauna benches are not just places to sit! Their location in relation to the heater and the height they are mounted on the wall will determine what kind of heat each bather will experience.
You probably already know that ceilings in home saunas have a maximum height of 7 feet so that the sauna heater can operate efficiently and the room is better able to contain the heat. From this starting point, the position of the benches should have these specifications:
If you’re wondering why it feels like the temperature is hotter on the top sauna benches, remember your physics class: you know that hot air rises, and you also know that the steam created by the water poured on the rocks raises the humidity briefly in the room.
This heated air creates convection current in the sauna as it rises and spreads to the ceiling and back down the walls pushing down cooler air towards the floor. (Cold air cannot come down unless hot air rises to take its place.)
The higher the temperature, the greater the volume the pushing hotter air wants to occupy. It completes the current by pulling along the floor to replace new air that is rising from the stove. Thus, the top bench in the sauna gets the hottest löyly!
You will like to take advantage of the presence of two sauna benches by moving up and down during the sauna. If you’re ordering any sauna parts or presently planning your sauna and are looking to buy a pre-cut or pre-built design, consider getting a two-bench sauna kit if at all possible.