Tongue and groove on all sides for easy installation. Isolated fillings, also knotholes and small pitch pockets are possible.
Healthy knots (max. 35 mm diameter) and splay knots (max. 20 x 60 mm), also one false knot per metre of plank length is permitted.
Knotholes of up to 20 mm diameter are closed with appropriate wood putty. Sealed cracks up to max. 1/3 of plank length are possible.
The surface is close-grained and its appearance very beautiful and uniform.