The structure of alder lining is fine and homogeneous. It is easily impregnated. Dry alder is one of the most deformation-resistant species of wood. Growth rings are barely visible. Alder has low thermal conductivity. It has been used in the construction of saunas, wells, and quays for centuries. Alder is very durable when comes into immediate contact with water. The colour may vary from pale pink to red.