Laminated veneer lumber (FSH or LVL ) was originally used as a panel material for planking, but is also suitable for flat structural elements in timber construction.
FSH consists of several layers of "peeled veneer" of approx. 3 mm thickness, which are glued together parallel to the fibres. The parallel fiber directions result in a high uniaxial load-bearing capacity and, due to the high number of layers, a very high homogeneity. Individual layers can be rotated 90 degrees to create better dimensional stability.
Tree species
Spruce, pine, Douglas fir or beech are mainly used for LVL, which has very high strengths. Processing into FSH also enables optimal material utilization of the odd beech trunks.
Gluing
Melamine-urea-formaldehyde resins (MUF) or phenol-formaldehyde resins (PF) are mainly used, the glue content is relatively high compared to cross-laminated timber (about 3% by volume) due to the many thin layers.
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