For the production of today's modern saunas, planks with tongues and grooves are used on the walls and planed planks on the benches. Only some wood types can be used for saunas because not every wood can cope with a rapid rise in temperature up to 90 - 100 ° C and high humidity. Spruce, aspen, alder and red Cedar are correctly selected woody plants for the production of saunas. The quality of wood for saunas is subject to the highest classification and is supplied in class A. The wood for saunas is not surface treated and left natural.
The quality of sauna wood is subject to the highest grading and is supplied in grade A. Because sauna floorboards must withstand high-temperature changes and high relative humidity in a very short period of time, the wood on the walls and ceilings will remain without visible dimensional changes, thanks to the extended tongue. Wood for saunas is not surface treated and left natural.