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Glulam: the maximum of timber

Glulam consists of at least three slats glued to each other. Multiple gluing provides a higher carrying capacity than normal timber. Besides very large cross sections and lengths are available. Glulam is dimensionally accurate and dimensionally stable and less susceptible to cracking. It maintains an equally good quality from a quality-controlled production. Glulam is a calculable building material due to exactly defined properties.

Our results regarding glulam

Merkle Holz offers:

  • Many available dimensions up to 72 cm height.
  • Up to 18 metres length available.
  • Large raw material stock for always short delivery times at special orders.
  • Glulam produced by list.
  • Visual quality material is produced from preplaned and presorted material.
  • Middle-European spruce.
  • Closely ringed larch (to DIN 68800 suitable up to hazard class 2).
  • Machined structures ready for installation.
  • Special requests such as impregnation, millimetre severing or profil planing.

Requirements: Quality criteria of glulam

Sorting feature Requirements on glulam

Visual quality

Industrial quality
 

Sorting class GL 24 c, GL 24 h and GL 28 c
Technical rules DIN 1052:2008 or DIN EN 14080:2013
Elasticity module II to grain GL 24 c: Eo,mean = 11.000 N/mm2
GL 24 h: Eo,mean = 11.500 N/mm2
GL 28 c: Eo,mean = 12.500 N/mm2
Timber moisture
max. 15%
Dimensional accuracy
(to EN 390)
Width ± 2 mm
Height + 1%/-0,5%
Length ± 0,1%
Lamella Thickness 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

Our scope of delivery regarding glulam

Spruce glulam
Produced from clean Middle-European spruce.

Larch glulam
Produced from closely ringed low-sap mountain larch (inquire for delivery programme).

  • Dried to approximately 12% timber moisture.
  • Property class GL 24 c, on request GL 24 h and GL 28 c as well.
  • Finger jointed and colourless melamine glued to DIN 1052.
  • Rafter heights available in 40-mm pitch (intermediate dimension planing possible).
  • Lengths from 6 m up to 18 m possible.
  • 60 and 80 mm width produced as separating material (approximately 3 mm smaller than specified).
                 Glulam

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Width (mm)
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