Toppers
What are the Sustainability Classes of Wood?
Durability classes of wood are essential when choosing the right type of wood for your project. This classification, established in the EN 350 standard, shows how well different types of wood resist fungi, insects, and other biological attacks. This knowledge is indispensable, especially for outdoor applications or in humid conditions.
The 5 durability classes
| Class | Description | Lifetime | Examples |
|---|---|---|---|
| Class 1 | Very durable | >25 years | Teak, Azobé, Iroko |
| Class 2 | Durable | 15-25 years | Oak, Western Red Cedar |
| Class 3 | Moderately durable | 10-15 years | Larch, Douglas |
| Class 4 | Less durable | 5-10 years | Pine, Spruce |
| Class 5 | Not durable | <5 years | Beech, Poplar |
Class 1 & 2: The champions for outdoors
- Perfect for terraces and cladding
- Excellent for hydraulic works
- Minimum 15-25 years lifespan
- Natural resistance to fungi
Class 3: The versatile middle performer
- Suitable for sheltered outdoor applications
- 10-15 years lifespan with proper use
- Often used in construction wood
- Affordable alternative with good performance
Class 4 & 5: The indoor players
- Ideal for furniture and interior finishing
- Protection against moisture necessary
- Cheaper option for dry environments
- Regular maintenance required for outdoor use
Frequently Asked Questions
Why is class 1 the most suitable for outdoors?
Class 1 wood types are very durable and resistant to fungi and moisture, making them ideal for outdoor use.
Can class 4 wood types be used outdoors?
Yes, but only with the right treatment. Without treatment, they are more susceptible to damage.
What determines the lifespan of wood?
The lifespan depends on the type of wood, treatment, and the level of exposure to moisture and fungi.
"The right type of wood in the right place can make the difference between a construction that lasts 5 years or 25 years."
Practical tip
Always choose class 1 or 2 for outdoor applications and check for treatment when using lower classes outdoors.