1. Raw material technical drying
Fresh lumber is being technically dried for over 48 hours in temperatures above 55°C, until it reaches a humidity of up to 12%. The lumber is then planed.
2. Sorting according to durability
Dried and planed planks are sorted visually and then by machine. Very strict criteria are applied in the case of components required to meet high aesthetic standards.
3. Removing knots and imperfections
After the sorting process, fragments of planks with lower durability or unsightly imperfections (such as large knots, resin bubbles or residual bark) are removed, depending on the required wood toughness and appearance. Thanks to appropriate dovetail-type joints, individual planks can be combined into practically endlessly long lamellae.
4. Finger-type joints
Finger joints are made by automated machines. The extremities of two lamellae are milled to produce matching endings and then glued under pressure. Many individual planks can be combined this way in a short time, creating a long lamella.
5. Lamellae planing
The lamellae are planed to achieve a girth of 45 mm.
6. Applying the glue
Glue is applied to the wider sides of the lamellae.
7. Pressing the lamellae
At least three lamellae are stacked one atop the other and pressed in a special, straight or bent press.
8. Planing the semi-finished products
The semi-finished glulam, created in the above-described steps, is then hardened under pressure. After hardening the product is usually being planed and chamfered.
9. Quality control, assembly and further works
Further works, such as installing steel elements, are usually carried out by the producer. The finished building material is then covered with wood preservatives and packed.
At this stage the product can be transported to the construction site. Storing builing materials in a clean and dry place on the construction site is among the key rules of wood construction. Quick construction work progress and sealing the building’s openings will protect the glulam components from absorbing excessive moisture.