100% guaranteed workmanship

IFC & SMAS certified

Free consultation

Prevent Widespread Fire Damage In Bristol & The South West

Penetration Sealing

Here at Fire Immunity, we offer a wide range of passive fire protection services including fire stopping and penetration sealing in Bristol and its surrounding areas. Penetration sealing systems are one of the main components of a building’s fire safety design and are vital in fire stopping and maintaining the building’s compartmentation. However, these systems are often installed incorrectly by non-specialists which can leave them open to vulnerabilities. Fortunately, our experienced fire stopping experts are here to help. Our team uses their knowledge and expertise to deliver tailored penetration sealing and fire stopping services that work for your building.

Expert Fire Stopping Services In Bristol


Fire stopping involves examining different compartments of a building to determine their effectiveness in preventing the spread of fire and smoke between different compartments. If we come across any potential issues, we ensure they are sealed, to improve the fire safety of your building. At Fire Immunity, we specialise in providing exceptional fire stopping services to property owners in Bristol and the surrounding areas. Our team of experienced professionals keep on top of the latest regulations and industry standards to ensure enhanced fire safety of your building. Get in touch today to find out more about our fire stopping services and how we can help you keep your property safe.

High Quality Floor & Wall Sealing By Fire Immunity

As one of the most crucial elements of passive fire protection, penetration sealing involves sealing around any cables, ducts and pipes that penetrate walls, floors or ceilings. This act of sealing walls and floors prevents the spread of fire and smoke and maintains the building’s fire integrity in the event of a fire. Penetration sealing is essential in providing proper fire stopping measures that meet regulations and ensure the safety of your building and occupants.

Additionally, penetration sealing enhances both acoustic performance and air sealing properties, preventing smoke, toxic gases, and fire from escaping through the smallest of openings around all penetrations and other services. It is an extremely cost-effective solution compared to other services.

Common Fire Protection Services Used For Penetration Sealing


At Fire Immunity, we will discuss your specific requirements with you to provide tailored services unique to your project. We take care to ensure our services cater to all possible circumstances. Our passive fire protection system services include cavity fire barriers and fire compounds.

Cavity Fire Barriers

Cavity fire barriers are a type of building component designed to close a concealed space. They work to protect a cavity wall or ceiling void against the penetration of smoke or flames while also restricting the movement and spread of smoke or flames in the space. They can be installed vertically or horizontally and can be made from different materials, depending on your building’s requirements.

Fire Compounds

Fire compound installation provides the necessary integrity value required as well as an added constructional element to the seal. They are formulated to expand when exposed to heat, thus creating a fire-resistant barrier that can withstand high temperatures and prevent the spread of flames. Fire protection compounds are gypsum-based and not only cost-effective but also long-lasting.

Pipe Wraps & Fire Collars


Fire collars & pipe wraps protect plastic pipework that passes between different building compartments. A pipe wrap is generally comprised of a layer of graphite intumescent sheet that is lined within a flexible polythene roll. The pipe wrap is extremely flexible and can be fitted and adjusted to multiple pipe sizes of up to 160-200mm in diameter.

On the other hand, a fire collar is usually comprised of a coated steel sleeve containing flexible graphite based intumescent material. The collar is then fixed mechanically to the structure the service is protruding from. Both pipe wraps and fire collars are often used in conjunction with intumescent sealant.


Fire Immunity are one of the leading providers of fire protection compounds in Bristol and the South West

Our Services includes:

Penetration Sealing In Bristol & Surrounding South West Areas

    Frequently Asked Questions - Wall and Floor Penetration Sealing

    Materials used for penetration sealing systems include intumescent sealants, fire barriers, and fire pillows. We also recommend the use of quality mastic seals and duct covers.

    Fire barriers are crucial when creating fire-resistant barriers within walls and floors. They prevent fire and smoke from moving through a building, maintaining compartmentation. We use a variety of products to provide effective fire protection.

    Duct covers are designed to seal penetrations made by ducting. This ensures that fire and smoke can’t spread through these openings. Duct insulation, combined with proper sealing methods, helps to create a fire-safe environment. It does this by providing insulation and fire protection equivalent to the surrounding walls, ceiling, and floor.

    Fire pillows are versatile passive fire protection products used in penetration sealing. They expand when exposed to heat, effectively sealing around penetrations. This prevents the spread of fire and smoke. Fire pillows offer excellent fire resistance and are easy to install and remove when needed.

    Approved firestop systems must meet test standards such as BS 476-20 and BS EN1366-3. These standards evaluate the performance of fire stop systems under fire exposure conditions. All our recommended fire-stop products comply with these test standards. This ensures reliable fire protection.

    Under specific conditions, electrical box membrane penetrations may not require fire-stopping assemblies. Compliance with the relevant building code and regulations is crucial.

    Electrical box membrane penetrations of a certain size, as well as limited aggregate opening area, are excluded. Electrical boxes with a specific annular space and proper separation are also excluded.

    Compartment walls and floors play a critical role in fire protection. They create separate fire-resistant compartments within a building’s structure. They help contain the fire and prevent its spread, providing time for safe evacuation.

    Service penetration seals are integral to the wider passive fire protection system. They create barriers around penetrations, maintaining the integrity of compartment walls and floors. This is done with a range of task-specific products. These include sealants, barriers, and pillows, contributing to a comprehensive passive fire protection strategy.

    A fire stop seal system must be durable with the ability to stand the test of time. Its acoustic performance must also maintain sound insulation. A top priority is for it to remain airtight, preventing smoke and toxic gas leakage. It must also accommodate any structural movement requirements.