Efficiency of visual strength grading of timber with respect to origin, species, cross section, and grading rules: A critical evaluation of the common standards

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32 Scopus citations

Abstract

Strength grading is essential for the efficient use of structural timber. Although international standards exist for machine strength grading, visual grading is still regulated based on national rules, which are expected to allow safe and economic grading results. Although there are large differences in the graded output because the species, the cross section, and the origin of the timber influence the results, some of these standards are considered to be applicable universally. The present article demonstrates how the chosen standards influence the grading results. Depending on the parameters, the yields or the mechanical properties are low compared with the declared values. The results also show the efficiency and applicability of different national standards for strength grading of timber from various origins. Furthermore, it is recommended to reconsider the existing limits for source areas and cross sections given in the standard EN 1912.

Original languageEnglish
Pages (from-to)203-216
Number of pages14
JournalHolzforschung
Volume68
Issue number2
DOIs
StatePublished - Feb 2014
Externally publishedYes

Keywords

  • Grading standard
  • Mechanical properties
  • Sawn timber
  • Timber grading
  • Timber source

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