In Sweden, testing method SP-Fire 105 is used for the approval of facade claddings in multi-storey houses as an accepted alternative to non-combustible A2 facades according to the BBR of Boverket. The manufacturer of an approved SP-Fire 105 facade must always ensure that the facade is covered by a type-approval certificate that includes its properties for exterior use, so-called durability, according to the CEN / TS 15912 DRF EXT.
IN PRACTICE, it does not matter if an approved system, regardless of the fire retardant that is being used, can withstand SP-Fire 105 procedures if the system has no durability properties. The use of systems that are tested and approved according to the SP-Fire 105 that lack durability causes their reaction to fire performance to deteriorate rapidly. There are fireproofing paints that cannot be used for facade cladding, just as there are fire retardants that may be leached due to hygroscopicity. It is therefore very important that expert fire consultants, architects and users such as building contractors only prescribe and use type-approved systems according to the SP-Fire 105 and CEN / TS 15912 EXT or EN16755 EXT.
THE SYSTEM CONSISTS OF a facade panel, latches, and possibly spaced boarding solutions in order to prevent a chimney effect. The SP-Fire 105 is a construction test of the facade cladding structure, not a test of the wall as a whole, such as with e.g. fire stopping construction. This is important to know as many people believe that if the wood panels comply with SP-Fire 105 requirements, then that automatically implies that the entire wall construction is certified; this assumption is incorrect. In cases where the underlying substrate does not consist of A1 or A2, some form of additional measures must be taken (e.g. the usage of A2 approved panels), if wood elements of D-s2, d0 class are being used. If special measures are taken during an SP-Fire 105 testing such as using sheet metal for facade cut-offs, then that type of sheet metal must always be used, just like perforated sheet metal is used for air gaps in testing. If a material is used in SP-Fire 105 testing but not used in practice, then an non-approved SP-Fire 105 cladding will be used. The standard substrate in the SP-Fire 105 test is a rig of lightweight concrete. Wooden panels that are mounted on substrates other than A2 must be insulated or have a fire rated A2-panel in order to meet Euroclass D-s2, d0-substrate requirements (e.g. gluelam beams, prefabricated modules, etc.).
GENERAL CHARACTERISTICS OF THE SP-Fire 105
- An approved alternative to non-combustible A2 facades.
- No falling parts.
- Limited flame propagation along the facade.
- A maximum of 80 kW heat radiation from the facade.
- A maximum of 450° C in the eaves.
- Industry requirements for the durability properties of the fireproofing agent, e.g. CEN / TS 15912 EXT.