The Truth About Pink Foam and Fire Stopping: Understanding the Limitations and Risks
Verus Group • 24 August 2023
Why is Polyurethane (PU) Foam used?
PU Foam, also known as expanding foam, is generally thought of as a cheap and quick-to-use product, and has been widely used in the construction industry filling and sealing gaps and penetrations. The PU foams which are marketed as fire-resisting and sometimes used for "fire stopping", are usually pink to distinguish from other foams, and are therefore commonly referred to as 'pink foam'. If a competent, third-party accredited contractor was present, however, it is extremely unlikely that they would recommend or use it for fire-stopping purposes.
6 reasons why PU Foam is not suitable for Fire Stopping:
- Lack of Proper Fire Resistance: Pink expanding foam, despite claiming to be 'fire-rated' on the packaging, often falls short when it comes to providing adequate fire resistance. Whilst is is not considered flammable, it may not have the necessary fire retardant properties and test data across a broad spectrum of scenarios which would be required for effective fire stopping in many instances.
- Insufficient Smoke Barrier: Fire stopping materials should not only prevent the spread of flames but also act as a barrier against smoke. Pink foam may not possess the necessary properties to effectively contain smoke, which can be equally hazardous during a fire incident.
- Limited Durability: Fire stopping materials should be able to withstand the rigors of time and maintain their integrity over the long term. Pink foam, however, may degrade or deteriorate over time, compromising its ability to effectively stop the spread of fire.
- Inadequate Expansion Control: Expanding foam can inflate in an unpredictable manner leading to uneven coverage, sometimes expanding beyond its intended boundaries, or even leaving unnoticed gaps. This can create pathways for fire and smoke to bypass the fire stopping measures, rendering them ineffective.
- Hazard to Health: Expanding foam can produce toxic fumes that can cause permanent health damage.
- Compliance Issues: Reputed organisations such as ASFP, BMTRADA, FIRAS, and IFE strongly recommend the removal and replacement of pink foam installations with authentic fire-rated alternatives. The primary concern lies in the difficulty of accurately tracing the product without conducting chemical composition testing. To ensure reliable fire safety measures, it is advisable to opt for fire-rated materials with suitable test data that can be easily identified and verified for their intended use.
If you have concerns over the use of pink foam within your building, contact us today for further advice.
Fire compartmentation surveys are essential to fire safety inspections. Learn how they prevent fire spread and ensure UK compliance with Verus Group.
From installation and ongoing maintenance. Learn how Verus Group Ltd delivers fire protection services and stopping repairs to keep buildings safe.
Discover how passive fire protection and fire‑stopping in London and across the UK ensure safety, compliance, and effective fire‑risk management.
Discover how rockwool mineral insulation enhances fire protection, improves compartmentation, and helps safeguard buildings & occupants, with Verus Group.
Discover why quick and effective fire door repairs are vital for safety and compliance. Protect your building with expert support from Verus Group.
Learn why a professional compartmentation survey is vital for loft spaces. Protect your building with expert fire protection from Verus Group.
Fire stopping is one of the most fundamental elements of passive fire protection, yet it is often misunderstood or overlooked. At Verus Group , we see first-hand how correctly designed and installed fire stopping systems play a vital role in protecting lives, property, and compliance across all building types. What Is Fire Stopping? Fire stopping refers to the sealing of gaps and penetrations within fire-resistant walls, floors, and compartments. These openings are commonly created by service installations such as pipes, cables, ductwork, and structural joints. Without appropriate fire stopping materials and methods, fire and smoke can spread rapidly through a building, bypassing critical fire barriers. Effective fire stopping helps maintain the integrity of fire compartmentation, allowing occupants time to evacuate safely and limiting damage until emergency services arrive. Why Fire Stopping Is Essential for Safety The primary purpose of fire stopping is to slow the spread of fire and smoke. Smoke inhalation is one of the leading causes of fire-related injuries and fatalities, and poorly sealed service penetrations allow smoke to travel unchecked through a building. By ensuring all fire-resistant elements perform as intended, fire stopping supports safe evacuation routes, protects escape stairwells, and reduces the risk of fire spreading between compartments, floors, or adjoining properties. Compliance and Legal Responsibilities Fire stopping is not just best practice, it is a legal requirement. UK building regulations and fire safety legislation place responsibility on building owners, duty holders, and facilities managers to ensure passive fire protection measures are properly installed and maintained. Inadequate or non-compliant fire stopping can lead to enforcement action, project delays, costly remedial works, and serious liability in the event of a fire. Regular inspections, surveys, and repairs are essential to demonstrate compliance and ongoing due diligence. The Risks of Poor or Incomplete Fire Stopping Common issues we encounter include incorrect materials, poor workmanship, undocumented installations, and damage caused by later building works. Even small gaps can compromise an entire fire compartment. Fire stopping repairs are often required in older buildings, retrofit projects, and sites that have undergone multiple service alterations over time. Identifying these risks early through professional fire stopping surveys can prevent significant safety failures. The Verus Group Approach to Fire Stopping At Verus Group, we deliver fire stopping installation, surveys, and remediation works tailored to each building’s structure and use. Our experienced engineers work across commercial, residential, healthcare, education, and industrial sectors, using tested systems from reputable manufacturers. We take a meticulous approach, ensuring all works are correctly installed, fully documented, and certified. This provides our clients with confidence that their buildings meet current fire safety standards and perform as intended. Protecting Buildings Today and for the Future Effective fire stopping is not a one-time task. Buildings evolve, services change, and materials degrade. Ongoing inspection and maintenance are critical to preserving fire safety throughout a building’s lifecycle. By prioritising fire stopping as part of a wider passive fire protection strategy, organisations can significantly reduce risk and ensure long-term compliance. Speak to Verus Group Today If you are responsible for building safety and want to ensure your fire stopping is compliant, effective, and fully certified, Verus Group is here to help. Contact our expert team today to arrange a fire stopping survey or discuss your project requirements. We are the trusted partner you can rely on for passive fire protection.
Learn how a fire protection system works, including fire stopping, fire doors, & the role of fire protection. Ensure your building is safe & compliant.
Fire door inspections explained for property managers, covering legal duties, inspection processes, common issues, and how Verus Group supports compliance.
Verus Group is proud to partner with Thames Hospice, a leading charity providing expert palliative and end-of-life care to those facing terminal illness across East Berkshire and South Buckinghamshire.