The first step in CLT panel production involves acquiring raw wooden boards, which are dried, planed, and cut, and then joined with micro-joints to form long lamellas. Each layer of CLT must be made from wood of the same strength class. Typically, the higher strength classes (C24 and above) are used for the longitudinal layers, whereas the perpendicular layers are made from at least C16 strength wood. Spruce is the type of wood we use the most commonly. The boards used for CLT elements typically range in thickness between 10 and 50 mm.

The second stage of production entails arranging the prepared wooden lamellas in layers that are perpendicular to each other and gluing them together to create the finished CLT product. The panels consist of an odd number of layers – 3, 5, or 7. Melamine (MUF) and polyurethane (PUR) adhesives are commonly used for bonding the individual layers. These adhesives must meet strict formaldehyde emission standards and are harmless to the health during production, use, and even in the case of a fire. Glued does not need to be applied to the side surface of the battens, which can be spaced up to 6 mm apart. Cross-laminated timber is glued in hydraulic or vacuum presses. In both cases, the appropriate pressure is applied to the bonded elements to ensure a durable connection.