"Standard" quality is recommended for those areas where economic efficiency has priority. It is ideal for making stairs, doors, long elements, etc. 1-2 healthy knots, end cracks as wide as the width of the piece and mirrors are accepted.
This quality accepts a higher percentage of sapwood, multiple healthy knots, end cracks twice the width of the piece. Vicious knots larger than 30 mm in diameter, the actual heart and the clogged shell are rehabilitated. Insect holes and rot are not accepted. Density 700 - 750 kg / m3.