Select Grade
Even colour, clear boards. Occasional sound pencil knots. No sap permitted
Prime grade
Minimal color variation. Mainly clear boards. Occasional sound knots up to 25 mm diameter. No sap permitted
Character grade
Minor color variation. Knots filled up to 60 mm diameter. Occasional sound hard sap on edges permitted.
Rustic Grade
Color variation and red allowed. Filled unlimited knots. Occasional boards with worms. Occasional sound hard sap on face area.