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 façade 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 standards EN16755 EXT or CEN/TS 15912 EXT.
In practice, it does not matter if approved systems, regardless of fire protection or fire retardant, can handle SP-Fire 105 if the system does not have long lasting properties according to EN16755 EXT or CEN/TS 15912 EXT 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 if EN16755 EXT or CEN/TS 15912 EXT is not verified by the notified body. Instead of a fireproof building, the developer will have received a flammable facade that does not meet the requirements in the Building and Planning (SFS 2010: 900, chapter 2:2), PBL.
There is fire protection paint that cannot be painted on exterior facade cladding as fire impregnants 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, - CEN/TS 15912.
This is important to know as many people believe that wood panels that comply with SP-Fire 105 go hand in hand with the entire wall structure, which is not true. However, the choice of substrate behind can drastically affect the fire process depending on the material choice. Subsequent substrates, i.e. insulation, is of great importance in a fire process. 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 prerequisite facade panel, nail cover, insulation with the underlying substrate eg. CLT.
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.