Cavity Barriers

Protecting Buildings with Effective Fire-Stopping Solutions

Cavity barriers are a crucial component of a building’s passive fire protection system, preventing the spread of fire and smoke through concealed spaces such as walls, floors, ceilings, and roof voids.

Without properly installed cavity barriers, fire can travel undetected, significantly increasing the risk to occupants and property.

At Overbrook, we provide expert cavity barrier installation and maintenance, ensuring compliance with Approved Document B, BS 9999, and BS 476-20/22 fire safety regulations.

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Call our Fire Safety support team on 01255 886982

What Are Cavity Barriers?

Cavity barriers are fire-resistant materials designed to seal off hidden voids in buildings, restricting fire and smoke movement.

They are typically installed within:

  • Wall and ceiling cavities
  • External cladding systems
  • Suspended ceilings
  • Roof spaces and soffits
  • Service risers and voids

By effectively containing fire within a compartment, cavity barriers help protect escape routes, structural integrity, and critical infrastructure.

"Overbrook provided an exceptional fire door installation service for our commercial building. Their team was professional, knowledgeable, and ensured full compliance with fire safety regulations. Highly recommended!"

Mark R. – Facilities Manager

"The team at Overbrook conducted a thorough fire risk assessment for our premises and helped us implement essential fire stopping solutions. Their expertise gave us complete peace of mind knowing our building is fully protected."

Sarah T. – Property Manager

"We needed high-quality fire-resistant glazing for our offices, and Overbrook delivered beyond expectations. Their attention to detail and adherence to fire safety standards were outstanding!"

James L. – Business Owner

"Overbrook’s fire door inspection and maintenance service has been invaluable to our organisation. Their proactive approach ensures all our fire doors remain compliant and fully operational at all times."

Emma W. – Compliance Officer

Why Cavity Barriers Are Essential

Fire Containment & Compliance

Cavity barriers play a vital role in compartmentation, preventing fire from spreading through concealed spaces.

UK building regulations require cavity barriers to be installed in line with:

  • Approved Document B – Specifies fire safety requirements, including cavity barrier placement.
  • BS 9999 – Fire safety codes of practice for building design, management, and fire protection.
  • BS 476-20/22 – Fire resistance testing standards for cavity barriers and penetration seals.
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Reducing Smoke Spread & Toxicity

Smoke inhalation is the leading cause of fire-related fatalities. Properly installed cavity barriers minimise the passage of smoke, helping to maintain breathable air in escape routes and reducing exposure to toxic gases.

Enhancing Building Safety & Longevity

Fire can cause structural damage when left unchecked. Cavity barriers improve fire resistance, reduce potential property damage, and ensure compliance with modern fire safety regulations.

Our Cavity Barrier Services

Expert Installation

We install high-performance cavity barriers tailored to your building’s design and fire safety requirements. Our expert team ensures compliance with the latest UK fire safety standards, using tested and certified materials for maximum protection.

Inspection & Compliance Checks

Fire safety regulations require regular inspections of cavity barriers to ensure continued effectiveness.

Our fire protection specialists assess:

  • Gaps and breaches that compromise fire resistance.
  • Material integrity and signs of deterioration.
  • Correct placement and sealing to meet regulations.

Repairs & Maintenance

If cavity barriers become damaged, displaced, or non-compliant, we provide prompt repairs and remedial work to restore fire resistance. Proper maintenance is essential for ongoing compliance and safety.

Let’s help you find the right solution

Ensure your building meets UK fire safety regulations with expert cavity barrier solutions from Overbrook. Contact our team today for professional installation, inspections, and maintenance services.

Let's Talk

Call our Fire Safety support team on 01255 886982

Who We Work With

We provide cavity barrier solutions for a range of industries and property types, including:

  • Commercial & office buildings – Ensuring fire safety in workplaces.
  • Healthcare & education facilities – Protecting hospitals, care homes, schools, and universities.
  • Property management & landlords – Helping landlords maintain fire safety compliance in HMOs and apartment blocks.
  • Public sector & government buildings – Implementing fire protection measures for high-occupancy structures.
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Insights & Advice

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Frequently asked questions

Are cavity barriers a legal requirement?

Yes. UK fire safety regulations mandate the use of cavity barriers in specific building voids to prevent the spread of fire and smoke.

Regular inspections should be carried out annually, or sooner if there are structural alterations, refurbishments, or suspected damage.

Cavity barriers are made from fire-resistant mineral wool, intumescent materials, and fire-rated boards, depending on the building’s requirements.

Yes. Our team conducts detailed inspections to assess compliance, identify risks, and provide solutions for non-conforming barriers.

Contact Overbrook today to schedule an inspection, installation, or maintenance service for cavity barriers.

Certified solutions

Installation

Properly installed fire-stopping solutions help contain fire within compartments, reducing damage and providing occupants with more time to evacuate safely.

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Cavity Barriers

Without properly installed cavity barriers, fire can travel undetected, significantly increasing the risk to occupants and property.

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Regulations

Fire safety regulations in the UK are designed to protect lives and property by enforcing strict requirements for fire prevention, containment, and evacuation.

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Fire Door Maintenance

We offer comprehensive fire door maintenance services to ensure your fire doors remain fully functional, compliant, and effective in the event of a fire.

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Fire Door Regulations

Find out important information about fire regulations, including key UK laws, compliance requirements, and responsibilities for building owners and landlords.

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