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Class 1 wood: very durable (CEN EN)

Category Summary

These wood species can withstand degredation by wood-destroying and maintain their structural integrity for over 25 years without treatment. There natural protection against these organisms give untreated wood products of these species a service life of at least 25 years. This classification is specified in European norm EN350. Norm EN350-1 describes the methods of testing and how the natural durability of wood species is determined. EN350-2 lists all wood species of importance used in Europe. This classification only applies to heartwood. Sapwood almost always classifies as not durable.

Category Details


  • Tough
  • Ver high resistance to wood-destroying fungi
  • Servicelife of at least 25 years without treatment


  • Natural composite: lignin matrix with cellulose fiber reinforcement
  • Polymer matrix composite
  • Wood
  • Class 5 wood - very durable

Classification Sources


Idemat 2003



Known health effects for this category.


No known health issues


Known environmental effects for this category.

  • No treatment is needed for a servicelife of more than 25 years
  • After it's servicelife untreated wood is easy to recycle recycled or can serve as fuel. The energy capacity is listed per wood specie when available

Environmental Sources


Idemat 2003