2. LVL STRUCTURES IN FLOORS, WALLS, ROOFS AND IN SPECIAL APPLICATIONS 2.3.4 Roof elements LVL purlins can be combined with off-site produced roof elements that are fast to install on site on all kinds of hall construction main frames. An installation speed of 1000 m2 per day for a ready roof is commonly achieved. The maximum dimensions of the elements depend on transportation limits, but 2.5 m x 20-25 m sizes are commonly used as a 3- or 4-span structure. For finishing of interior and exterior surfaces, gypsum board ceiling panels, vapour barrier, thermal insulation, Figure 2.38. Roof elements with LVL purlins for hall construction can be used on any type of main frame. decking panels and water proof membrane the elements are delivered as a single complete package. Secondary beams and battens may be made of LVL or solid wood depending on the choice of manufacturer. Roof overhangs may also be integrated with the edge elements. The roof elements are typically ventilated (cold roof) with a U-value of 0.07-0.15 W/mK and fire resistance class R(EI) 15-60 depending on the local requirements and customer specifications. Metsä Wood LVL Handbook Europe 73
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