Section Contents

EN 789 : 2004

Timber structures – Test methods – Determination of mechanical properties of wood-based panels

This standard describes test methods for determining some mechanical properties of commercial wood-based panel products for use in load-bearing timber structures.  These properties are intended for the calculation of characteristic values according to EN 1058 : 2009 – Wood-based panels – Determination of characteristic values of mechanical properties and density.  The characteristic values so calculated are used to obtain the design values for the use of plywood, OSB and LVL in timber structures designed to Eurocode 5.

The mechanical properties being tested are:

  • Bending properties
  • Compression properties in the plane of the panel
  • Tension properties
  • Panel shear properties
  • Planar shear properties.

Both EN 789 and EN 1058 are referenced in the harmonised European standard EN 13986 for wood-based panel products.  EN 789 is not intended to be used for quality control testing.

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What is a ‘life cycle stage’ and how do these link to the environmental assessment of whole buildings?

How do core category rules link with environmental product declarations?

Whose responsibility is it to check that wood products being imported into the EU do not originate from illegally sourced timber supplies?

Does the EUTR require mills to provide any extra documentation for customs entry into the European Union?

Must all plywood and OSB panels carry a CE marking?

What is the definition of a construction product under the CPR?

What is a Declaration of Performance referred to under the Construction Products Regulation?

What is the difference between Structural 1 and Exposure 1?

Does structural panel siding have shear values?

What are mould and mildew, and do they compromise the integrity of engineered wood?

The CE-mark on an APA plywood panel means it conforms to European Standards – but which ones?

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The main standards are: EN 13986 and EN 300

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The main standards are: EN 13986, EN 636, EN 314, EN 635-3