Close the hidden paths
fire travels behind cladding.
Ventilated facades and concealed cavities let fire and smoke spread unseen. Cavity barriers close those paths in a fire while allowing the ventilation the facade needs in normal use. Toggle the section to see both states.
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Cavity Fire BarrierIntumescent sealVentilation airflowFire / heat
Ventilated (service state): the Cavity Fire barrier is fixed to the structure with its intumescent seal facing the cladding, leaving a designed air gap (up to 44 mm) so the cavity stays ventilated and drained.
Open-state cavity barriers are tested to BS 8414 (principles of ASFP TGD 19). The free-air-gap must match the tested configuration, not the nominal cavity width. Pairs with vertical non-ventilated barriers along compartment party-wall lines.
Applications & Performance
Fire rating
EI 120 min
integrity / insulation
Cavity gap
< 450 mm
leaves ≤44 mm air gap
Standards
BS 8414
to ASFP TGD 19
Applications
Ventilated facades
concealed cavities, high-rise