Country grade - very diversified wood colour and structure, strong tints, joined, cracked knots or with losses up to 65 mm in diameter acceptable (holes and shakes are filled with a suitable wood filler), closed core acceptable, sapwood unacceptable.

The above image shows solid oak floorboards with a smooth surface, finished with a colourless oil (finishing code S01), dimensions of 20.5 x 140 x 610-2610 mm.