1. LVL AS A CONSTRUCTION MATERIAL 1.8 LVL SIZES AND LAYUPS LVL is produced in a continuous layup process from 3 mm veneers. This process optimally produces fairly thin, but wide and long beams, panels and studs cut from 1200-2500 mm wide billets. Maximum lengths range from 18-25 m depending on the production line. Due to the continuous process, the length can be individually specified for each billet. The minimum length is however limited to 2000 mm due to handling in the production process, so shorter components need to be cut separately. Standard widths are defined to minimize waste and to complement the dimensions of other building structures. The standard layups and product thicknesses are shown in Table 1.6. Table 1.6. Nominal product thicknesses and layups of LVL-P and LVL-C. The thickness to height ratio of LVL-P standard beams is limited to 1:8 to ensure dimensional stability in normal building site humidity conditions. Weather exposure on one side of a beam may lead to cupping of higher beams. Table 1.7 shows the standard sizes of LVL-P available from several manufacturers; these sizes are thus usually available in the shortest delivery times. LVL is easy to cut, so custom sizes are possible on separate request, making it an attractive option for many building systems. A more slender beam thickness to height ratio can be used if moisture conditions are controlled throughout the whole production chain, e.g. in off-site production of wooden roof elements for hall constructions. Table 1.7. Standard sizes of LVL-P beams. LVL 01, Table 1.5 Thickness [mm] Number of veneers Layup of LVL-P Layup of LVL-C Number of cross veneers in LVL-C 24 8 IIIIIIII II-II-II 2 27 9 IIIIIIIII II-III-II 2 30 10 IIIIIIIIII II-IIII-II 2 33 11 IIIIIIIIIII II-IIIII-II 2 39 13 IIIIIIIIIIIII II-III-III-II 3 42 14 IIIIIIIIIIIIII - 45 15 IIIIIIIIIIIIIII II-IIII-IIII-II 3 48 16 IIIIIIIIIIIIIIII - 51 17 IIIIIIIIIIIIIIIII II-IIIII-IIIII-II 3 57 19 IIIIIIIIIIIIIIIIIII II-III-IIIII-III-II 4 63 21 IIIIIIIIIIIIIIIIIIIII II-III-III-III-III-II 5 69 23 IIIIIIIIIIIIIIIIIIIIIII II-IIII-III-III-IIII-II 5 75 25 IIIIIIIIIIIIIIIIIIIIIIIII II-IIII-IIII-IIII-IIII-II 5 LVL 01, Table 1.6 Beam thickness [mm] Beam height [mm] 200 220 225 240 260 300 360 400 450 500 600 27 33 39 42 45 48 51 57 63 69 75 LVL Handbook Europe 39
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