durability classes

Also referred to as resistance or durability, is usually according to the standard DIN EN 350-2 determined. Here the resistance to insects, fungi and harmful substances, which increase the rotting of the wood, is tested. The classification is from class 1 (very durable) to class 5 (not durable). Class 1 wood (e.g. cumaru or teak) has a life expectancy of more than 25 years under moderate climatic conditions. Class 3 wood (such as Bangkirai) has a life expectancy of up to 15 years. Class 5 wood (e.g. beech) has a life expectancy of less than five years (see: wood species comparison).

DURABILITY CLASSES WOOD

Here you will find an overview of what the resistance class says about the lifespan of wood outdoors:

Class	Lifespan	Types of wood
1 = very persistent	at least 25 years	Teak, Cumaru
1-2 = very persistent	at least 20 years	Jatoba, Garapa
2 = permanent	15 to 25 years	Bongossi, Bangkirai
3 = moderately durable	10 to 15 years	Siberian larch, Douglas fir
4 = not very durable	5 to 10 years	Spruce
5 = not permanent	less than 5 years	Maple, birch, beech