Poplar trees are known to grow taller than any other U.S. hardwood species. It is found alone in open, rich, moist soil. Because of its fast maturity, the lumber from poplar is lightweight and soft for a hardwood. It is strong, durable and seasons well resisting warping once it is dried and has no knots. Saunacore constructs sauna with this type of wood for people that suffer from allergic reactions from the natural oils in cedar wood. This type of wood used is up to ¾” thick.
Saunacore Canadian built sauna wood is kiln-dried up to 10% less moisture content in their cedar and poplar wood. Air dried wood is not as curing, and an older method of wood drying. The wood moisture content is much higher than 10% which has a much greater chance of the wood to warp or crack.