2. LVL STRUCTURES IN FLOORS, WALLS, ROOFS AND IN SPECIAL APPLICATIONS 2.3.5 Roof panels LVL-C panels are suitable for load-bearing panel structures in roofs. Thicker panels allow longer spans between supports, and LVL-C forms a durable base for waterproof roofing. As most of the veneers are parallel to the surface veneer direction, the capacity of the panels is better in the main direction, enabling longer maximum spans. Sometimes, however, it is more practical to install the panels so that they are supported from their long edges. The charts in Figures 2.42. and 2.44. provide information on suitable panel thicknesses for different spans in preliminary design, and sections 1.13 and 5.7 give information on joints and connections. It is recommended to treat LVL-C panels against mould growth when used in unheated spaces. From large, robust LVL-C it is possible to build roof overhangs that have a very light appearance because no other load-bearing support structure is needed even in corner overhangs. Information on suitable panel thicknesses and spans when the panel has an overhang in only one direction (parallel or perpendicular to grain of the surface veneer) is given in Figure 2.50. If the panel is used as an overhang in both the parallel and perpendicular direction to also provide a corner overhang, the maximum span length LC must be in accordance with Figure 2.51. in both directions. LVL 02, Figure 2.40.A 75 69 63 57 51 45 39 33 27 24 0,0 0,5 1,0 1,5 2,0 2,5 3,0 3,5 4,0 4,5 5,0 Maximum span length [m] LVL 36 C ROOFING PANEL, SINGLE SPAN PARALLEL TO GRAIN, SURFACE STRUCTURE 0,20 kN/m2 sk = 0,65 kN/m2 sk = 1,5 kN/m2 sk = 2,75 kN/m2 Panel thickness [mm] 75 69 63 57 51 45 39 33 27 24 0,0 0,5 1,0 1,5 2,0 2,5 3,0 3,5 4,0 4,5 5,0 Maximum span length [m] LVL 36 C ROOFING PANEL, SINGLE SPAN PARALLEL TO GRAIN, SURFACE STRUCTURE 0,60 kN/m2 sk = 0,65 kN/m2 sk = 1,5 kN/m2 sk = 2,75 kN/m2 Panel thickness [mm] 75 69 63 57 51 45 39 33 27 24 0,0 0,5 1,0 1,5 2,0 2,5 3,0 3,5 4,0 4,5 5,0 Maximum span length [m] LVL 36 C ROOFING PANEL, MULTIPLE SPAN PARALLEL TO GRAIN, SURFACE STRUCTURE 0,20 kN/m2 sk = 0,65 kN/m2 sk = 1,5 kN/m2 sk = 2,75 kN/m2 Panel thickness [mm] 75 69 63 57 51 45 39 33 27 24 0,0 0,5 1,0 1,5 2,0 2,5 3,0 3,5 4,0 4,5 5,0 Maximum span length [m] LVL 36 C ROOFING PANEL, MULTIPLE SPAN PARALLEL TO GRAIN, SURFACE STRUCTURE 0,60 kN/m2 sk = 0,65 kN/m2 sk = 1,5 kN/m2 sk = 2,75 kN/m2 Panel thickness [mm] Figure 2.42. Span tables of LVL-C roof panels for predesign. Span length parallel to grain of surface veneers. Calculations according to EN 19951-1:2004+A1:2008 and its Finnish National Annex. Service class 2, Loads: g2 = own weight of surface structure, sk = snow load at ground level; 0,8 ∙ sk = snow load at roof level. Wind load wk = 0,4kN/m2, maintenance load q H = 0,4 kN/m2. Point loads are not taken into account. Deflection limit wnet,fin ≤ L/100. 76 LVL Handbook Europe
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