Produtos / Madeira coladas & KVH / BauBuche / BauBuche Beam

BauBuche Beam

  • BauBuche Träger

BauBuche Beam
The 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

<h4>Fastener comparison of BauBuche beams with spruce glulam GL28h.</h4>

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

BauBuche Beam 12 bolts ø12

  • baubuche-verbindungsmittelvergleich..jpg
    Utilisation ratio of the bolts: 100 %
  • 2baubuche-verbindungsmittelvergleich..jpg
    A = 32.000 mm²

Spruce glulam GL28h 20 bolts ø12

  • 5baubuche-verbindungsmittelvergleich..jpg
  • 4baubuche-verbindungsmittelvergleich..jpg
    A = 48.000 mm²

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.

  • vergleich-zwischen-baubuche-und-fichte-brettschichtholz..jpg
  • baubuche-halle-web-Kopie.jpg
    BauBuche Beam – Project example

Characteristic strength, rigidity and density values for glulam made of laminated beech veneer lumber (BauBuche Beam made of bonded lamellas).

Strength ClassGL 70
Characteristic strength (N/mm²)
fm,y,kCharacteristic bending strength value for flatwise bending
of the glulam lamellas
70 a)
fm,z,k 0,kCharacteristic bending strength values for edgewise bending
of the glulam lamellas
ft 0,kCharacteristic strength value for tension parallel to grain55 b)
ft,90,k Characteristic strength value for tension perpendicular
to grain
fc,0,kCharacteristic strength value for compression parallel to grain49,5 c),d)
fc,90,kCharacteristic strength value for compression perpendicular to grain8,3 c)
fv,kCharacteristic strength value for shear4,0 e)
Rigidity Values (N/mm²)
E0,meanAverage elasticity modulus value parallel to grain16.700
E0,055 % quantile value of the elasticity modulus parallel to grain15.300
E90,meanAverage elasticity modulus value perpendicular to grain470
E90,055 % quantile value of the elasticity modulus perpendicular
to grain
GmeanAverage value of shear modulus850
G055 % quantile value of shear modulus760
Density Values (kg/m³)
ρkCharacteristic density value680

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

Ingenious hardwood

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.

  • BauBuche uses local raw materials from sustainable forests with PEFC certification.
  • BauBuche is beneficial both to the environment and people because
    at its source in the forest it produces oxygen and binds CO2.
  • Applying precise engineering technology, BauBuche preserves the morphology and strength of the natural wood.
  • BauBuche carries higher loads than softwood products.
  • BauBuche has a wide range of applications – from the smallest component
    up to 18-meter-long boards and beams.
  • The load-bearing capacity of BauBuche reduces dimensions and cross-sections
    in timber construction – more space and less material consumption.
  • BauBuche is distinguished by its 3,7 mm veneer layer precision and exceptional surface quality.
  • BauBuche is as easy to work with as solid wood, and is ideally suited for use
    in visible construction elements..
  • BauBuche revitalized the possibilities of laminated veneer lumber with top-quality aesthetics and unmatched strength.
  • The high density and uniformity of BauBuche saves on fasteners and thus costs.
  • BauBuche is price competitive through efficient manufacturing and economical use of materials.

Bending strength, density, and modulus of elasticity of BauBuche
laminated veneer lumber in comparison with other materials.

characteristic bending strengthcharacteristic densityspecific bending strengthmodulus of elasticity
4848010013.800laminated veneer lumber from spruce
244705111.600glulam from spruce (GL24h)
2357.85030210.000steel (S235)