In Sweden, test method SP-Fire 105 is used for the approval of facade cladding systems in multi-storey houses as an approved alternative to non-combustible A2 or A1 class according to the Swedish National Board of Housing, Building and Planning's BBR.
Approved SP-Fire 105 facade cladding system does not have to be type-approved, but all "serious manufacturers" voluntarily apply type-approval certificates where the certificate includes approved suitability properties for the external environment according to standard EN16755 EXT.
In practice, it does not matter if approved systems for fire protection paint or fire impregnating agent can handle SP-Fire 105 if the system does not have suitability 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 cladding systems approved according to SP-Fire 105, this is money thrown down the drain if the suitability properties are not verified by a notified body, e.g. RISE. Applying alternatives such as individual doctoral students or universities that are not accredited to the standard can not be equated with a notified body.
There is fire protection paint that cannot be painted on exterior facade cladding systems, just as there is fire impregnating agents 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 with approved suitability properties according to EN16755 EXT.
SP-Fire 105 is a construction test of the facade cladding's system structure, not a design test of the wall as a whole as a fire-separating construction. In a situation where the underlying substrate consists of e.g. glass wool insulation, rock wool insulation, it is a supplementary documentation that the insulation manufacturer must provide that the combination meets the requirement.
The SP-Fire 105 test mainly consists of checking the radiation value from the facade (<80 kW/m2), eaves temperature (<450 °C), fire spread in the air gap and also falling parts and fire spread along the surface of the facade.
The 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, nailing batten, insulation with underlying substrate e.g. CLT, Rockwool, Isover, Kingspan Coolterm, Finnfoam.
Woodsafe PRO™ and Woodsafe Exterior WFX™ are tested in many variations and many combinations with underlying substrates. Contact one of our partners for more information about what has been tried and approved.
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. EN16755 EXT is a requirement for exterior application.
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