PFC Corofil Open State COSB 25
PFC Corofil Open State Barrier COSB 25 is a stone wool fire barrier designed for ventilated façade systems that maintain a continuous air gap under normal conditions.
PFC Corofil COSB 25 is a open‑state cavity barrier that combines a high‑density stone wool core with a high‑expansion intumescent strip fixed to the outer face. In the event of fire, the intumescent expands into the air gap, helping to reinstate the fire compartmentation of a façade system.
- Designed for ventilated cavity widths up to 450 mm including a 25 mm air gap
- Fire resistance up to 180 minutes integrity
- Fire resistance up to 120 minutes insulation
Fixed with mechanical brackets or direct fix depending on cavity width
Available in pre‑cut lengths with foil or polythene wrapping
Tested to recognised standards for open‑state cavity barriers
A high‑performance open‑state barrier delivering both airflow and fire protection in ventilated cavity façades.
The COSB 25 barrier supports ventilated cladding systems by allowing airflow and drainage under normal conditions, yet when exposed to fire the intumescent strip activates to close the air gap and help prevent fire and smoke spread. Its robust stone wool construction and certified performance make it suitable for a wide range of new build and refurbishment applications.
Engineered for straightforward installation, the barrier accommodates variable cavity depths and integrates with modern rainscreen or curtain wall systems. It offers architects, specifiers, and contractors a trusted solution for meeting fire‑safety standards while maintaining ventilated façade performance.
In-House Metal Fabrications
Whether it’s a planned package or an urgent site requirement, our in-house fabrication team can manufacture roofing and cladding components to suit your project.
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