2. LVL STRUCTURES IN FLOORS, WALLS, ROOFS AND IN SPECIAL APPLICATIONS Figure 2.24. A) Top slab support detail of LVL rib slab or open box slab floor structure on exterior wall and intermediate wall. B) Rib slab or open box slab floor structure supported from the bottom on exterior wall and intermediate wall. Alternative A) has simpler geometry of the wall elements and less wood loaded perpendicular to grain. A B Stressed-skin panels can be supported from the bottom as with normal joist floors. Another alternative is top slab support where the LVL-C panels are longer than the ribs which are anchored to the top panel with screws, and only the cantilever parts of the top panels are on the supports. This detailing facilitates site installation of the floor elements and simplifies the geometry of the supporting wall elements. It must be noted, however, that top slab supported elements may have slightly smaller maximum spans or may need thicker top panels and higher ribs to ensure adequate capacity of the support connection. Stressed-skin panels can be CE marked based on the European Technical Assessment (ETA) of the element supplier 22, 23. 64 LVL Handbook Europe
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