Protecting Buildings with Expert Cavity Barrier Installation Across the UK

At CS Passive Fire, we specialise in cavity barrier installation to prevent the spread of fire, smoke, and toxic gases within concealed spaces. Our team of certified professionals ensures that your building complies with BS 476-20, BS EN 1366-4, and Approved Document B of the UK Building Regulations.

What Are Cavity Barriers?

Cavity barriers are fire-resistant materials installed within wall cavities, roof spaces, and other concealed areas to compartmentalise fire and smoke, slowing their spread and protecting escape routes. These barriers are typically made from intumescent materials, mineral wool, or fire-resistant boards, which expand when exposed to heat, effectively sealing off cavities to block fire and smoke.

Why Are Cavity Barriers Essential?

  • Fire Containment: Prevents the rapid spread of fire and smoke through cavities, safeguarding lives and minimising property damage.

  • Building Regulation Compliance: Meets the requirements of The Regulatory Reform (Fire Safety) Order 2005, helping building owners avoid fines and legal issues.

  • Enhanced Safety: Safeguards occupants by maintaining protected escape routes during a fire emergency.

  • Insurance Requirements: Many insurance providers require compliance with fire safety standards, including the correct installation of cavity barriers.

  • Peace of Mind: Knowing your building has the correct fire protection measures in place provides reassurance to occupants and owners alike.

Our Cavity Barrier Installation Services

We offer comprehensive cavity barrier solutions for various applications:

  • Walls & Floors: Barriers for vertical and horizontal cavities to compartmentalise different building sections.

  • Roof Voids: Fire-stopping in roof spaces to prevent unseen fire spread through loft and attic areas.

  • Facade Systems: Installing cavity barriers within external cladding to mitigate fire risks, especially in high-rise buildings.

  • Service Voids: Protecting cavities where services like pipes, cables, and ductwork pass through fire-rated structures.

Our team uses trusted products from industry-leading manufacturers to deliver high-performance, durable solutions that are rigorously tested and certified for fire resistance.

Our Process

  1. Initial Assessment: We conduct a thorough inspection of your building to identify concealed cavities and potential fire risks.

  2. Customised Plan: Develop a tailored installation plan aligned with UK regulations and your building's specific needs.

  3. Installation: Our skilled technicians install cavity barriers with precision and care, ensuring seamless integration into your building's structure.

  4. Certification & Documentation: Upon completion, we provide full documentation, including test certificates and installation records, for compliance purposes.

  5. Ongoing Maintenance & Inspection: We offer regular maintenance services to ensure the continued effectiveness of installed cavity barriers.

Materials We Use

CS Passive Fire uses only tested and certified materials that meet UK fire safety standards. Our materials include:

  • Intumescent Strips: Expand when heated, sealing gaps to block fire and smoke.

  • Mineral Wool Batts: Dense, fire-resistant panels for cavities in walls and floors.

  • Fire-Resistant Boards: Rigid boards that provide robust fire barriers.

  • Fire-Stopping Sealants: High-performance sealants for sealing gaps and joints.

Compliance & Quality Assurance

CS Passive Fire adheres to the highest industry standards, working with fire-stopping materials tested to:

  • BS 476-20: Fire resistance of cavity barriers.

  • BS EN 1366-4: Fire performance of service installations.

  • Approved Document B: UK Building Regulations for fire safety.

We also conduct post-installation inspections and issue certificates of conformity to verify compliance and performance.

Who We Work With

  • Construction Companies

  • Property Developers

  • Facilities Management Firms

  • Commercial and Residential Property Owners

  • Housing Associations

  • Educational Institutions

  • Healthcare Facilities

FAQs about Cavity Barrier Installation

Q: How do cavity barriers work?
A: Cavity barriers are made from materials that expand when exposed to heat. This expansion seals off hidden gaps within wall and roof cavities, containing fire and smoke to their point of origin.

Q: Are cavity barriers a legal requirement in the UK?
A: Yes, Approved Document B mandates cavity barriers in concealed spaces to ensure fire safety compliance in both new and existing buildings.

Q: How often should cavity barriers be inspected?
A: Regular inspections are recommended as part of your ongoing fire risk assessment, typically annually or whenever structural alterations are made.

Q: Can cavity barriers be retrofitted into existing buildings?
A: Absolutely. Our team has extensive experience retrofitting cavity barriers into older buildings to bring them up to modern fire safety standards.

Q: What happens if cavity barriers are not installed correctly?
A: Improper installation can lead to fire spreading unchecked, endangering lives and property. It can also result in non-compliance with UK fire safety laws, potentially leading to legal action and invalidated insurance.

Get a Quote Today

Don't leave fire safety to chance. Contact CS Passive Fire today for expert advice and professional cavity barrier installation services across the UK