Requirements:

Quality criteria for 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 DIN 4074-1 sorting class
S 10 TS;
C 24 to DIN 1052-2008		 DIN 4074-1 sorting class
S 10 TS.
C 24 to DIN 1052-2008
Dovetail joint DIN 68140-1 or
DIN EN 385		 DIN 68140-1 or
DIN EN 385
Technical rules Approval by the supervisory authority
for buildings
Z 9.1-440		 Approval by the supervisory authority
for buildings
Z 9.1-440
Elasticity module II to grain
 Eo,mean = 11600 N/mm²
 Eo,mean = 11600 N/mm²
Timber moisture max. 15% 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		 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 = 4 mm/2 m
Processing the ends Cut at right angle Cut at right angle
Surface condition planed and chamfered Levelled and chamfered