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product overview |
| Our Product | Visual Characteristics | Strength | Dimensions & Stock Unit Sizes | Static/Technical Data | Service |
Strength
BULLINGER glue laminated wood is always defined in terms of the intended use for the component. In doing so, a distinction is made between optical and statical requirements:
Following DIN 4074.1 "Grading of coniferous timber in terms of bearing capacity" there are two ways for grading: visually and mechanically. The lamella used for glue laminated wood production is graded based on following criteria: knot sizes, slope of grain, grain structure, splits, etc?
Aside from these criteria, machine stress grading measures the modulus of elasticity of the lumber. The result of this process is a more precise and evenly graded lamella.
GRADING | DIN/EN | STRENGTH CLASSES | GRADED BY | |||
visual | DIN 4074 | S 7 | S 10 | S 13 |
| trained specialists |
mechanical | DIN 4074 | MS 7 | MS 10 | MS 13 | MS 17 | DIN 4074.3 approved machine |
* EN 338 only available as a draft | ||||||
STRENGTH CLASSES DO NOT SAY MUCH ABOUT THE OPTICAL CHARACTERISTICS OF GLUE LAMINATED WOOD.
The four strength classes of glue laminated wood and their related grading classes of lamella.
CLASSES | BS 11 / GL 24 | BS 14 / GL 28 | BS 16 / GL 32 | BS 18 / GL 36 |
grading class as per DIN 4074 | S 10 | S 13 | MS 13 | MS 17 |
grading classes as per EN 338 | C 24 | C 30 | C 35 | C 40 |
modulus of elasticity grain/parallel | 11.000 | 12.500 | 13.000 | 14.000 |
permissible tension z II | 8,5 | 10,5 | 11 | 13 |
use | normal standard quality | slightly improved bearing capacity | considerable stresses | maximum stresses |
AT BULLINGER | STANDARD | ON REQUEST | STANDARD | ON REQUEST |
BULLINGER glue laminated wood standard, is strength classes BS 11( GL 24) and BS 16 (GL 32) and Eurocode 5.
As one of the most up-to-date glue laminated wood manufacturer in Europe, the BULLINGER production facility is equipped with a "mechanical strength grading system". This allows BULLINGER to produce all strength classes up to BS 18 for which MS graded lamella is needed!