BauBuche BeamThe high strength of the beams made of beech laminated veneer lumber bonded parallel to the grain allows the production of slim structures for large spans and heavy load conditions. Strips of BauBuche S-board can be used as beams with "small" cross-sections up to 80 mm in width. The sides show the top-quality hardwood surface and the veneer layers are visible on the top and the bottom. Beams with cross-sectional widths of 50 to 300 mm are manufactured by bonding 40 mm thick strips of S-board. In these beams the sides show the appealing veneer layers and the top and the bottom the hardwood surface pattern. BauBuche Beams are sanded for a visually pleasing look.
Beams made of bonded lamellas
Width 50 - 300 mm
Height 120 - 600 mm,
Height up to 1.360 mm on request
Length up to 18 m*
*longer lengths on request
S-board beams
Width 40, 60, 80 mm
Height 100 - 1.000 mm
Length up to 18 m*
*longer lengths on request
Fasteners for BauBuche (beech laminated veneer lumber) must be dimensioned in compliance with section 4.2 according to EN 1995-1-1 in conjunction with EN 1995-1-1/NA with the equations for solid wood. Nd = 300kN, tensile splice double shear, internal steel plate
Static calculation: Pirmin Jung Ingenieure für Holzbau
Comparison between BauBuche and spruce glulam when used in a lattice girder.
Due to higher rigidity and higher density BauBuche allows for considerably slimmer components when at the exposure to the same load.
Characteristic strength, rigidity and density values for glulam made of laminated beech veneer lumber (BauBuche Beam made of bonded lamellas).
Strength Class | GL 70 | |
Characteristic strength (N/mm²) | ||
fm,y,k | Characteristic bending strength value for flatwise bending of the glulam lamellas | 70 a) |
fm,z,k 0,k | Characteristic bending strength values for edgewise bending of the glulam lamellas | 70 |
ft 0,k | Characteristic strength value for tension parallel to grain | 55 b) |
ft,90,k | Characteristic strength value for tension perpendicular to grain | 1,2 |
fc,0,k | Characteristic strength value for compression parallel to grain | 49,5 c),d) |
fc,90,k | Characteristic strength value for compression perpendicular to grain | 8,3 c) |
fv,k | Characteristic strength value for shear | 4,0 e) |
Rigidity Values (N/mm²) | ||
E0,mean | Average elasticity modulus value parallel to grain | 16.700 |
E0,05 | 5 % quantile value of the elasticity modulus parallel to grain | 15.300 |
E90,mean | Average elasticity modulus value perpendicular to grain | 470 |
E90,05 | 5 % quantile value of the elasticity modulus perpendicular to grain | 40 |
Gmean | Average value of shear modulus | 850 |
G05 | 5 % quantile value of shear modulus | 760 |
Density Values (kg/m³) | ||
ρk | Characteristic density value | 680 |
a) Under flatwise bending stress of the glulam lamellas the characteristic value
of the bending strength may be multiplied by the coefficient of
kh,m = (600/h)0,14
h = the height of the glulam cross section in mm
b) The value of the characteristic tensile strength parallel to the grain may be multiplied by the coefficient of
kh,t = (600/h)0,10
h = greater lateral length of the glulam cross section at a right angle to the longitudinal axis in mm
c) The characteristic strength value for compression may be increased by the factor 1,2 in the case of exclusive use of the glulam under service class 1.
d) The characteristic strength value for compression parallel to the grain may be increased by the factor of
kc,0 = min (0,0009 × h + 0,892; 1,18) in case of more than three lamellas of laminated veneer lumber are being used in the glulam beam.
h = height of the glulam section in mm
e) The characteristic strength value for shear may be multiplied by the coefficient of
kh,v = (600/h)0,25
h = height of the glulam beam in mm
Wood as a building material has recently been experiencing a well-deserved revival. Its versatility as a material has long been known but its significance as a renewable resource has only been re-discovered in recent years.
Until now almost exclusively softwoods were used in timber construction. To process hardwoods as building material used to be too complicated and too expensive.
At Pollmeier, we have changed that. With the aid of applied science we were able
to develop a completely new process technology, which allows us to economically produce top-quality laminated veneer lumber from European beech for structural applications. We call it “BauBuche” and we use only raw materials from local and sustainably managed forests in its production.
The tree is rotary peeled in one of the most modern production facilities in Europe and transformed into a high-tech material with hardly any loss in value of the material. This is carried out in production line precision: on the one side a whole tree trunk is fed in, on the other side out comes BauBuche. BauBuche includes boards and beams for structural timber construction as well as panels for furniture and interior design.
With its exceptionally high strength BauBuche allows structures with significantly slimmer dimensions, compared to softwood materials. The high surface quality makes BauBuche ideally suited for visible construction elements. And the cost-efficient manufacturing technology places structures using BauBuche at the same price level as conventional softwood structures.
Bending strength, density, and modulus of elasticity of BauBuche
laminated veneer lumber in comparison with other materials.
characteristic bending strength | characteristic density | specific bending strength | modulus of elasticity | |
N/mm² | kg/m³ | Nm/g | N/mm² | |
70 | 680 | 103 | 16.800 | BauBuche |
48 | 480 | 100 | 13.800 | laminated veneer lumber from spruce |
24 | 470 | 51 | 11.600 | glulam from spruce (GL24h) |
120 | 2.700 | 44 | 70.000 | aluminium |
235 | 7.850 | 30 | 210.000 | steel (S235) |