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Duo-/trio beams: the high-quality timber

Duo-/trio beams are laminated wood beams consisting of two or three individual wood elements glued against each other. Their one or two colourless glue joints hardly disturb the solid wood appearance. Duo-/trio beams are produced in KVH® quality and has even higher quality requirements in the areas of crack formation and dimensional stability. The quality of duo-/trio beams is equally good because of a quality-controlled production with defined properties. Those properties make duo/trio beams a calculable building material.

Our results regarding duo/trio beams

Merkle Holz offers:

  • Standard stock of visual quality in 13 metres available any time.
  • Up to 18 metres length available.
  • Large raw material stock for always short delivery times at special orders.
  • Duo-/Trio beams produced by list.
  • Visual quality is produced from preplaned and presorted material.
  • Standard Si dimensions also available in high-quality nordic spruce.
  • Machined structures ready for installation.
  • Special requests such as impregnation, millimetre severing or profil planing.

Requirements: Quality criteria of duo/trio beams

Other properties see KVH®.

Sorting feature Requirements on

Duo-/Trio beam-Si
visual quality

Duo-/Trio beam-NSi
  industrial quality

Sorting class C24 according to DIN EN 14081-1 with DIN 20000-5
Dovetail joint DIN 68140-1 or DIN EN 385
Technical rules Approval by the supervisory authority for buildings
Z 9.1-440
Elasticity module II to grain
Eo,mean = 11600 N/mm²
Timber moisture max. 15%
Dimensional accuracy of the cross section DIN EN 336, Dimensional tolerance class 2
≤ 10 cm ± 1.0 mm
≥ 10 cm ± 1.5 mm
Cracks, radial shrinkage cracks
(drying cracks)
Crack width b ≤ 2% of the related cross-section width, max. 4 mm DIN 4074-1
Longitudinal warping / Twisting = 4 mm/2 m
Processing the ends Cut at right angle
Surface condition planed and chamfered Levelled and chamfered

Our scope of delivery regarding duo/trio beams

Spruce Duo-/Trio beams Si

Thickness Width
  10 12 14 16 18 20 22 24
8          
10  
12  
14    
16      
18         duo-trio-balken-18-20-24.jpg duo-trio-balken-18-20-24.jpg duo-trio-balken-18-20-24.jpg
20           duo-trio-balken-18-20-24.jpg duo-trio-balken-18-20-24.jpg duo-trio-balken-18-20-24.jpg
24               duo-trio-balken-18-20-24.jpg

Spruce Duo beams nSi

  10 12 14 16 18 20 22 24
6
8
10
12  
14    
16      
18        
20          
24              

Douglas-fir Duo beams

  12 16 18 20 24
10      
12
16    

Dimensioning of duo-/trio beams

More Information: www.kvh.eu

Duo Trio