Standards
Examples of use of treated wood
| Risk group | Operating rules | Field of application | Recommended wood preservation category |
|---|---|---|---|
|
1 |
Internal storage in a dry place |
Furniture, interior decoration |
2 |
|
2 |
Stored above the ground under a canopy and fully protected from the weather, but high environmental humidity can cause
random while not
throughput. |
Roof truss, shelter
used for exterior finishing
consumer wood |
2 |
|
3 |
Above ground and
affected by constant weather conditions or frequent watering; relatively easy
the damaged parts are replaced and the damage caused by the consequences is moderate. |
3.1. For outdoor use
wooden details, such as windows, doors, etc. 3.2. Exterior finishing, utility wood for garden fences |
B
AB |
|
4 |
Wood has exposure
soil, water or is directly dependent on weather conditions;
there is no access to the wooden part or the consequences of the damage caused are significantly severe. |
Telephone poles, railway sleepers, fence posts, shavings,
wooden components for exterior finishing, such as
stairs, decking, etc.
Wooden slats, ground-floor girders. |
A |
|
5 |
Offshore timber structures (3, and emergency structures or special durability structures).
and strength requirements. |
Sea berths, harbor bridges,
wood used for the construction of piles. |
M |
Regulation of the relationship between NWPC conservation classes M, A, AB and B and European Standards EN 351-1 and EN 335.
Penetration category according to EN 351-1. Relationships between risk groups H1-H5 of EN 335 and conservation classes M, A, AB and B.
| Category | Penetration requirement | H1 | H2 | H3 | H4 | H5 |
|---|---|---|---|---|---|---|
|
P1 |
Missing |
|
|
|
|
|
|
P2 |
At least 3 mm laterally and 40 mm
longitudinal penetration of malt wood |
|
|
|
|
|
|
P3 |
At least 4 mm lateral penetration of sapwood |
|
|
|
|
|
|
P4 |
At least 6 mm lateral penetration of malt wood |
|
|
|
|
|
|
P5 |
At least 6 mm lateral and 50 mm
longitudinal penetration of malt wood |
|
|
B |
|
|
|
P6 |
At least 12 mm laterally
penetration of malt wood |
|
|
|
|
|
|
P7 |
At least 20 mm lateral penetration of sapwood (for roundwood only) |
|
|
|
|
|
|
P8 |
Full penetration of malt wood |
|
|
AB |
A |
M |
|
P9 |
Full penetration of malt wood and 6 mm
penetration into visible vertebrae |
|
|
|
|
|
Estonian standards
EVS-EN 84:2020 Wood preservatives. Accelerated aging of treated wood prior to biological testing.
EVS-EN 252:2014 Field test method for determining the relative protective capacity of a wood preservative in direct contact with soil.
EVS-EN 275:2000 Wood preservatives. Determination of protection against shipwrecks.
EVS-EN 330:2014 Wood preservatives. External test method to determine the relative protective capacity of a wood preservative when the wood preservative is used under cover and not in contact: L-joint method (wood beam extension method).
EVS-EN 335:2013 Durability of wood and wood – based products. Use classes: definitions, application to solid wood and wood-based products
EVS-EN 350:2016 Durability of wood and wood-based products – Testing and classification of durability to biological agents of wood and wood-based materials
EVS-EN 351-1:2007Durability of wood and wood products. Solid wood treated with preservatives. Part 1: Classification of penetration depth and retention of protective equipment.
EVS-EN 351-2:2007 Durability of wood and wood products. Solid wood treated with preservatives. Part 2: Guidance on sampling for analysis of wood treated with preservatives.
EVS-EN 460:1999Durability of wood and wood products. Natural durability of solid wood. Guidance on durability requirements for wood in hazard classes.
