In Sweden, test method SP-Fire 105 is used for the approval of facade cladding in multi-storey houses as an approved alternative to non-combustible A2 facade 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 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 in an external environment where the panel is surrounded by rain, moisture and UV light.
If the builder invests in systems approved according to SP-Fire 105, this is money thrown down the drain. 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.
The system's structure consists of panels, bars and any air gap measures to prevent a chimney effect and flame propagation.
SP-Fire 105 is a construction test of the facade cladding structure, not a construction test of the wall as a whole as fire retardant construction.
This is important to know, as many believe that wood paneling that meets SP-Fire 105 goes hand in hand with the entire wall structure, which is not correct.
In cases where the underlying substrate does not consist of A1 or A2, then additional action, such as A2-approved discs are used if the backing substrate consists of wood elements with performance D-s2, d0.
In essence, SP-Fire 105 consists of testing the radiation value from the facade (<80kW/m2), roof foot temperature (<450° C), as well as falling parts and flame propagation along the facade surface.
The structure of the façade construction is tested and verified approved in most designs with the insulation, insulation board, air gap, facade ventilation, the structure's substrate such as CLT.
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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