2. LVL STRUCTURES IN FLOORS, WALLS, ROOFS AND IN SPECIAL APPLICATIONS 2.5.3 Reinforcement of old structures Old wooden structures can be reinforced by screwing or nailing LVL-C panels to their sides in areas subjected to high shear forces or tension perpendicular to the grain. The method is useful for notches, holes in beams, and for glulam beams with large cracks. Old joist floors can be reinforced by fastening LVL-P beams to the side or no top of them. Inclined screw connections have good stiffness and provide efficient joint action between the old joists and LVL-P reinforcement. In some cases the reinforcements can be glued to the old structures, but to fully utilize the advantages of rigid structural gluing the requirements for gluing conditions and quality control of the process must be met. 2.5.4 Stair cases Large LVL-C panels can be used for the load-bearing structure of staircases, forming at the same time an architecturally interesting railing element. In smaller sizes, LVL boards are used as stair stringers which are covered with decorative panelling. Figure 2.85. Reinforcing structures with LVL-C panels. Glulam beams with notches, holes, prevention of drying cracks. Figure 2.86. Staircase of LVL-C. Metsä Wood 102 LVL Handbook Europe
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