Rothoblaas - Wood screws and connectors Page 16
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LVL AND HARDWOOD HIGH DENSITY WOODS Chestnut, oak, cypress, beech, eucalyptus, bamboo and many other exotic woods are increasingly being used in construction. In addition to these, elements in Microllam® lumber, called LVL (Laminated Veneer Lumber), are also used. These are continuous elements, obtained from thin layers of different species of wood (fir, pine, beech) just a few millimetres thick, overlapped and glued together. Microllam® sheets can be produced with longitudinal grains or crossed grains depending on the structural use of the element. MICROLLAM® LUMBER The resulting elements offer absolute dimensional stability and high mechanical performance for a wide range of applications (beams, joists, pillars, walls, floors, curved elements, etc.). Rothoblaas has conducted extensive testing to analyse the performance of cylindrical shank fasteners on LVL elements, considering several parameters: MICROLLAM® LUMBER WITH CROSS-GRAIN VENEER 1. Different types of wood and their densities 2. Presence/absence of pre-drill holes 3. Fully/partially threaded fasteners 4. LVL panels with one/two-way grain 5. Application of fasteners on the side/narrow surface thickness surface thickness between 21-90 cm widths up to 2.50 m lengths up to 18,00 m cover surface front surface The test results obtained proved useful as they provided detailed verification of minimum applicable distances and analysed the different screwing forces according to installation and geometry of the fastener used. 16 | LVL AND HARDWOOD | CARPENTRY
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