To ensure fine grinding, it is always advisable to kiln-dry it first.
With softwoods it is a common practice to kiln-dry direct from the saw.
Toughen and kiln-dry in a couple days in a mild but unvarying temperature.
It has a green weight, an air-dry weight, a kiln-dry weight, and an oven-dry weight.
To kiln-dry properly, a free current of air must be maintained, of sufficient volume to carry off this moisture.
The inner bark is in some places made into mats, and in Norway they kiln-dry it and grind it with corn as an ingredient in bread.