In Sweden, test method SP-Fire 105 is used for the approval of facade systems in multi-storey houses as an approved alternative to non-combustible A2 class according to the Swedish National Board of Housing, Building and Planning's BBR.
Approved SP-Fire 105 facade shall always be subject to approval by the manufacturer where approval includes long-term durable fire performance for the exterior environment according to EN16755 EXT.
In practice, it does not matter if approved systems for fire protection paint or fire retardant can handle SP-Fire 105 if the system does not have fire-resistant properties according to EN16755 EXT in an external environment where the panel is surrounded by rain, moisture and UV light.
If the builder invests in facade systems approved according to SP-Fire 105, this is money thrown down the drain if EN16755 EXT is not verified by a notified body. Instead of a flame retardant building, the developer will have received a flammable facade that does not meet the BBR requirements.
There is fire protection paint that cannot be painted on exterior facade cladding, just as there is fire impregnants that are leaked due to hygroscopicity. It is therefore very important that expert fire consultants, architects and downstream users such as contractors only prescribe and use type-approved systems according to SP-Fire 105 and EN 16755 DRF EXT.
SP-Fire 105 is a construction test of the facade claddings system structure, not a construction test of the wall as a whole as fire retardant construction.
This is important to know, as many believe that facade systems that meets SP-Fire 105 goes hand in hand with the entire wall structure, which is not correct.
However, the choice of underlying substrate can drastically affect the course of the fire depending on the choice of material. Underlying substrate, i.e. insulation, is of great importance in the course of a fire. Although materials such as stone, and glass wool e.g. Rockwool and Isover are classified as A2, these materials have major differences that affect the facade's ability to achieve SP-Fire 105. It is therefore important that the entire system is tested and classified as approved with the included condition, facade panel, nail batten, insulation with underlying substrate e.g. CLT, Rockwool, Isover, Kingspan Coolterm.
In essence, SP-Fire 105 consists of testing the radiation value from the facade (<80kW/m2), roof foot temperature (<450° C), lame propagation in air gap as well as falling parts and flame propagation along the facade surface.
Exterior WFX Technical brochure
The use of fire-protected wood in an exterior environment places high demands on the properties of the fire protection agent to withstand rain, cold, heat, etc. SS-EN16755 EXT is a requirement for exterior application.
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