Finishing boards N20 are made of high-quality spruce saw logs, and can be used as interior and exterior (cornice) finishing materials for walls and ceilings. To prevent deformation during operation, the finishing boards are industrially dried and contain 18% (+/- 2%) moisture. There are two classes of finishing boards available: class 1 and class 2, both have a smooth, planed surface. After purchase, the materials should preferably be stored in a dry space with low humidity.