Requirements: Quality criteria of glulam

 

 
  
Sorting feature Requirements on glulam

Visual quality

Industrial quality
 

Sorting class GL 24 h GL 24 h
Technical rules DIN 1052-1, DIN EN 14080 DIN 1052-1, DIN EN 14080
Elasticity module II
to grain		 Eo,mean = 11600 N/mm² Eo,mean = 11600 N/mm²
Timber moisture
 max. 15%
 max. 15%
Dimensional accuracy
(to EN 390)		 Width ± 2 mm
Height + 1%/-0,5%
Length ± 0,1%		 Width ± 2 mm
Height + 1%/-0,5%
Length ± 0,1%
Lamella Thickness 40 mm 40 mm
Repaired knots
and defective spots		 Permissible not necessary
Dropped-out and loose knots up to Ø ≤ 20 mm
permissible from Ø ≥ 20 mm
to be replaced at the factory		 Permissible
Shrinkage cracks up to 4 mm without limitation
Resin galls Resin galls up to 5 mm wide are permissible Permissible
Discolouration due to blue stain,
red or brown strips		 not permitted without limitation
Insect attack not permitted permissible are worm grooves up to 2 mm
Surface planed and chamfered flush