• Gluing D4;
• finger-jointed in length;
• 3 times glued in width, the same width of lateral slats (min 15 mm);
• after gluing to thickness 4 ground / planed (tolerance -0 / + 2 mm);
• slight chamfer of about 2 mm;
• without color requirements, no blueness;
• 20% of the slats may max. 3 resin galls in the size of 3 x 40 mm have;
• closed surface;
• no vacancies, e.g. no cracks + no open joints;
• no fouling, no worm infestation and other feeding points;
• small solid branches are allowed;
• Moisture content: max 10-12%;