Concrete Fire & Blast Walls
Precast concrete solutions for safer, more resilient buildings
Why Choose Precast for Fire & Blast Walls?
When safety is crucial, you can’t afford to compromise. Precast fire and blast walls offer a durable, low-maintenance solution to protect people, property, and operations. Designed and manufactured off-site, our walls arrive ready for installation, helping you achieve fire separation and blast resistance without delaying your programme.
Whether you need fire walls for industrial buildings, blast separation for energy facilities, or protective barriers for high-risk environments, precast solutions make construction faster, safer, and more predictable.
Key Benefits of Precast Fire & Blast Walls
Proven fire resistance – Precast concrete can achieve up to 120 minutes of fire resistance with the right cover to reinforcement, providing reliable protection in demanding environments.
Inherent durability – With no exposed reinforcement, walls won’t corrode or weaken over time, even after years of exposure.
Fast installation – Units are manufactured off-site and delivered ready for installation, minimising disruption and on-site labour.
Flexible design options – Choose from panels, cast-in walls, or blocks depending on your project requirements, wall height, and loadings.
Suitable Products For Concrete Fire & Blast Walls
Best for: Cost-effective fire walls and separation in warehouses, storage facilities, and industrial buildings.
Prestressed panels are a flexible choice for fire and blast barriers, installed horizontally between steel columns or vertically in king post systems. Their modular design makes them ideal for long runs of fire separation walls.
Manufactured with C50 concrete.
Thicknesses reach up to 280mm for higher performance.
Panels span up to 6 metres between steel supports.
Joints can be sealed to improve fire resistance.
Best for: Blast protection, fire separation, and perimeter walls up to 6m high.
Installed into a reinforced concrete footing, vertical cantilever panels offer a freestanding walling solution without the need for steelwork. This makes them ideal where frame integration isn’t an option.
Designed to withstand up to 10kN/m² surcharge.
Cast in C50 concrete with 30mm reinforcement cover.
Smooth finish on visible faces.
No steel columns needed – panels are self-supporting.
Best for:High-risk industrial sites, energy facilities, and critical infrastructure.
Where maximum resilience is needed, heavy-duty cast-in walls provide engineered strength and increased cover to reinforcement. These walls are designed for high surcharge capacity and long-lasting durability.
Securely cast into foundations for stability.
Surcharge capacity tailored to project needs.
Square edges for close alignment.
Fire and blast resistance with correct detailing.
Best for: Temporary fire breaks, segregation walls, and flexible layouts
A quick, modular solution for temporary or reconfigurable fire and blast walls. Without reinforcement and a Class A1 rating for fire, Allegro® blocks give you speed and flexibility without compromising safety.
Unreinforced concrete – no risk of corrosion.
Blocks interlock for stability, requiring no fixings.
Available in standard and part-block sizes for flexible layouts.
Quick to install, reposition, or remove.
Case Study Spotlight - Acoustic Barrier Installation at Heathrow Airport
When Heathrow Airport needed a robust acoustic barrier to reduce noise pollution and improve operational efficiency, the installation had to meet strict engineering, security and logistical requirements.
The project involved installing a large acoustic barrier system designed to protect nearby areas from aircraft noise while supporting key airport operations.
What to Consider Before You Build a Fire or Blast Wall
- Fire Resistance Requirements – Confirm the fire separation needed early in the design process. Precast concrete can achieve up to 120 minutes of fire resistance when the reinforcement cover is increased, but the final detailing must comply with the building or zone specification.
- Blast Loading & Surcharge – Understand the forces the wall must resist — including blast pressure, wind load, and any surcharge from nearby ground or structures. Vertical cantilever systems generally withstand up to 10 kN/m², while heavy-duty cast-in options can be designed for higher demands.
- Foundation Type & Structural Integration – Select a footing method suitable for the wall system: Prestressed panels span between steel columns or king posts. Vertical cantilever panels sit in reinforced trench footings and become self-supporting after curing. Cast-in walls are secured directly into the slab or foundation for maximum stability. Accurate levels and steel spacing are essential for smooth installation.
- Installation Method & Access – Plan access for lifting, delivery, and plant. Fire and blast walls are often installed around existing structures, equipment, or busy industrial operations, so sequencing and safe lifting zones should be agreed in advance.
- Wall Thickness & Height Constraints – Fire and blast performance depend on panel thickness, reinforcement cover, and overall height. Prestressed panels have a maximum thickness of 280mm and can be stacked up to 6m high; vertical and cast-in systems can also achieve similar heights.
Joint Detailing for Continuous Protection – Joints may require fire-rated mastics to improve separation performance. For blast walls, square edges or close alignment help maintain structural integrity. Agree on sealing and jointing methods during design, not after installation.
Temporary vs Permanent Requirements – If the layout might change, Allegro® interlocking blocks provide a Class A1 fire rating and can be installed, repositioned, or removed quickly. They’re ideal for temporary fire breaks, segregation, or phased works.
Service Life & Long-Term Durability – Precast concrete is inherently durable and won’t corrode, even in harsh industrial environments. For longer design life or critical infrastructure, increased reinforcement cover can be specified.
Concrete Fire & Blast Wall Questions We Get All The Time
Our products are made from high-strength concrete and can achieve up to 120 minutes’ fire resistance when designed with additional cover to reinforcement. We don’t provide formal fire certification, but we can advise on the detailing needed to meet project requirements.
Precast fire and blast walls are generally designed up to 6m high. For taller walls or specific loading conditions, we can engineer bespoke solutions.
That depends on the setting. Panels work well for long, continuous fire separation. Vertical cantilever panels suit freestanding walls where steelwork isn’t practical. Allegro® blocks are best for temporary or flexible layouts.
Yes, sealing joints with fire-rated mastic can increase resistance times and help ensure continuous protection across the wall.