DESIGN PROCESS
the frame designer or the structural engineer. The grade of steel for the brackets and cleats should be confirmed and it may be that the items are manufactured from the same grade steel as the SFS, such as s390 and s450 grade and min Z275 coating. See SCI P433 for further guidance.
Items within the cavity, such as cavity trays, ducts, vents and weep holes, are now standard requirements on builds and the manufacturers should be consulted to ensure the fire performance of these items does not inhibit the fire performance of the building and meets the requirements for the reaction to fire classification. Note: the regulations in Scotland differ from England, Wales and Northern Ireland with regards to the requirements for cavity trays, which are now exempt from the regulations. See The Building (Scotland) Amendment Regulations 2022 legislation.gov.uk/ssi/2022/136/regulation/3/made The infill SFS is fixed from structural slab to structural slab. The framing may be flush, in bond or in cantilever from the slab edge, and this will require consideration when detailing the through- wall system. DEFLECTION HEAD DETAILING Check with the system owner that they have evidence for the deflection head detailing for fire resisting through-wall construction.
STEEL FRAME LIMITING TEMPERATURES
Designers should consider the limiting temperature of the structural steel in collaboration with the structural engineers when detailing the interface with the structural frame. This will inform the type and performance of the fire protection required, which may necessitate higher performance to ensure that the deflection capability of the external wall system is included in the calculation.
CONCRETE FRAME TYPICAL BUILD-UPS
Cavity barrier
Concrete
Insulation
Infill SFS including boards and framing
Cladding
Head track with slots to allow deflection at the head
Cavity barrier
Concrete
Generic detail of through-wall (concrete frame)
Note: Ccavity barriers are shown indicatively and may be open state or closed depending on the cladding type.
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