We are happy to provide assistance helping you to find the best quality laminated timber. We provide laminated timber corresponding to varying sizes and strength criteria, guaranteed to have long life spans and meet your needs.
A century ago it was possible to acquire sawn timber with dimensions of 150 mm * 450 mm, with lengths up to 20 meters as the raw materials derived by natural means facilitates such dimensions. Nowadays, however, it requires some effort to have access to materials with dimensions of 75 mm * 250 mm * 5 m. In addition to this, sawn timber is becoming increasingly expensive.
Due to the aforementioned reasons it is nowadays rare to find ceiling beams which have been constructed from a single log or beam. Construction logs of varying quality are becoming increasingly more expensive and hard to come by. As a result of this the use of artificial timber products is becoming ever more widespread. In most cases such products are meant for special purposes as the quality requirements are often somewhat unorthodox with regard to the strength, durability, dimensions, etc.
Glue Laminated Timber (Glulam) has been designed in order to be used in load bearing structures. Glulam is derived by gluing together at least four sizeable timber lamellas in a manner that the grain of the lamellas runs longitudinally along the laminated timber components. In most cases the sawn timber used must be strength assorted, with top layers consisting of lamellas having the best properties. By correct choice of lamellas, it is possible to manipulate the qualities of the laminated timber along desired lines.
Weatherproof glues are utilised in the manufacturing process, which allow the use of laminated timber in outdoor conditions. The lamellas can also consist of finger jointed parts which facilitate production of laminated timbers of virtually unlimited dimensions, with transport loads being virtually the sole constraints placed upon maximum dimensions.
Using the finger jointed method to manufacture lamellas makes it possible to extract all segments that could potentially diminish the strength or quality of the lamellas. It is also possible to manufacture arch or semi-circle shaped lamellas by bending it during the gluing process, thereby giving the finished product the desired shape. Use of bent laminated timber facilitates construction of architecturally outstanding structures.
Laminated timber beams have been certified by the MPA Stuttgart Otto-Graf Institute. The primary strength classes are GL 24, GL 28 and GL 32 (for more detailed information on strength classes see below).
What are supply times for laminated timber beams?
- Depending on the quantity and dimensions of products ordered – from 1 to 2 weeks
Where are laminated timber beams usually used?
- In load bearing structures of buildings and structures – inc. in roof construction (girders)
Which timber is used for the manufacture of laminated timber beams?
What are the advantages of using laminated timber beams?
- enables the manufacture if oversized (exceeding 6 meters) beams
- is both stronger and more durable than ordinary timber
- is not prone to cracking or drying
- will not alter shape or bend when drying
- is not susceptible to deformations due to weather conditions (rain, wind, cold, head, etc.)
What type of glue is used in the manufacture of laminated timber beams?
- Melamine glue, light colour, DIN 68141 (EN 301)
Strength specifications for laminated timber beams
Laminated timber beams are marked by the acronym GL (glulam). Associated strengths of laminated timber beams are given in the table below. The values for strength and rigidity of laminated timber beams are measured by the units N/mm2 and density kg / per m3.
|Strength classes for laminated timber beams||GL 24h||GL 28c||GL 32c|
|Shear strength||fv,g,k a)||2,5|
|Elasticity module||E0,g,mean c)||11.600||12.600||13.700|
a) Characteristic fluid shear strength fg,R,k can be equated to 1.0N/mm2 for all strength classes
b) offset module (along with continuous intersections) can be measured as Gg R,k = 0.10 Gg,mean
c) Rigidity values Eg,0,5; Eg,90,0.05 and Gg,0.05, are calculated as follows: Eg,90,0.05 = 5/6 Eg,90,mean; Gg,0.05 = 5/6 Gg,mean
The following table includes the names of strength classes pursuant to DIN 1052-1/A1: 1996-1910 in cases where compliant with DIN 1052: 2008-10.
|DIN 1052-1/A1: 1996-10||DIN 1052: 2008-12|
|BS 11||GL 24h – 1)GL 24c – 2)|
|BS 14||GL 28h – 1)GL 28c - 2)|
|BS 16||GL 32h – 1)GL 32c – 2)|
|BS 18||GL 36h – 1)GL 36c – 2)|
1) h = homogenous
2) c = combined