Cavity Barriers

What Are Cavity Barriers?

Cavity barriers are fire-resistant materials installed within concealed spaces such as wall cavities, roof voids, and floor voids. Their role is to stop or slow the spread of fire and smoke through hidden voids—essential for maintaining compartmentation and protecting escape routes.

Cavity barriers are typically required in:

• External wall cavities (e.g., behind cladding systems)
• Internal wall voids and partitions
• Roof spaces and ceiling voids
• Around openings such as windows, doors, and vents

Why Cavity Barriers Matter

Without properly installed and maintained cavity barriers, fire can spread rapidly and invisibly through hidden spaces—undermining the building's overall fire strategy.

• Required under UK Building Regulations (Approved Document B)
• Supports compartmentation and fire resistance
• Essential in buildings with cladding systems or external wall cavities
• Protects lives and limits property damage
• A key part of PAS 9980:2022 and Fire Safety Act 2021 considerations

Who Needs Cavity Barrier Services?

• Main contractors and developers
• Housing associations and local authorities
• Property managers and landlords
• Facilities and compliance managers
• Care homes, hospitals, and educational buildings

If you're responsible for a building's safety—especially one with a cladding system or concealed voids—then cavity barrier compliance is a critical requirement.

Why Choose HK Fire Ltd?

• Experienced, Qualified Installers
• Third-Party Accredited
• Certified and Compliant Materials
• Photographic and Traceable Documentation
• Minimal-Disruption Services
• Nationwide Coverage
• Fast Turnarounds for Compliance Deadlines

We work with you to protect your property and its occupants—whether you're at the planning stage, mid-project, or dealing with remediation after a failed inspection or fire risk assessment.