|
The Nordic countries Denmark, Finland, Iceland, Norway and Sweden cooperate within the framework of the Nordic Council in order to include harmonisation of national law while defining an overall classification of material.
Table 1: Nordic council classification
|
Component |
Fire test method |
Description |
Classification |
|
Material |
NT 001 |
Non-combustibility test |
Non-combustible/ combustible |
|
Wall and ceiling lining |
NT 003 |
Fire protection ability of coverings |
K0 / K1 / K2 |
|
Interior surface finishes |
NT 002 |
Ignitability test |
ln 1 / ln 2 / ln 3 |
|
Exterior surface finishes |
NT 004 |
Heat release and smoke generation test |
Ut 1 / Ut 2 |
|
Roofing |
NT 006 |
Roof fire spread |
Ta 1 / Ta 2 |
|
Floor coverings |
NT 007 |
Flooring fire spread and smoke generation |
G |
The actual classification used for Finland regulations for the fire behaviour of materials/component is described in the standard National Building Code of Finland, Part E1, Fire Safety of Buildings, 1997. 3 fire classes of building are considered (see tables below):
Table 2: building class tests for all materials excepted floorings
|
Characteristic |
Test |
Assessment |
|
Non combustibility |
ISO 1182: Fire test for building materials: Reaction to fire, Non-combustibility test |
|
|
Ignitability |
SFS 4190:E (NT FIRE 002) Fire tests. Building products: Ignitability
ISO 5657 (NT FIRE 033) Fire tests-Reaction to fire.Ignitability of building products. |
Class 1:non-igniting surface
Class 2: slowly igniting surface |
|
Fire spread characteristics |
SFS 4192:E (NT FIRE 004) Fire tests. Building products: Heat release and smoke production |
Class I: non-fire spreading surface
Class II: slowly fire spreading surface |
Table 3: Fire class and use of the building
|
|
Fire class of the building |
|
|
High fire level requirement |
Medium fire level requirement |
Low fire level requirement |
|
Dwellings:
Walls and ceilings |
2 / -
Slowly igniting surface, No demands for fire spread |
1 / I
Non igniting surface, Non-fire spreading surface |
2 / -
Slowly igniting surface, No demands for fire spread |
|
Accommodation:
Walls and ceilings |
2 / -
Slowly igniting surface, No demands for fire spread |
1 / I
Non igniting surface, Non-fire spreading surface |
2 / -
Slowly igniting surface, No demands for fire spread |
|
External surfaces of External wall |
1 / I
Non igniting surface, Non-fire spreading surface |
1 / I
Non igniting surface, Non-fire spreading surface |
2 / -
Slowly igniting surface, No demands for fire spread |
|
Surfaces adjacent to Ventilation gaps |
1 / I
Non igniting surface, Non-fire spreading surface |
1 / I
Non igniting surface, Non-fire spreading surface |
- / -
No requirement |
In residential or office buildings of class P1 with not more than 4 storeys, residential or office buildings of class P2 with 3-4 storeys and institutional buildings of class P2, materials of class 2/- may be used for the external surfaces of external walls if:
- The building is provided with an automatic extinguishing system
- The spread of fire along the surface of the external wall and the ventilation gaps has been limited by partitioning elements and
- The hazard of external ignition has been taken into consideration.
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