BOSS 813+ Firestop PU Foam: Redefining Passive Fire Protection In Modern Construction

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Post Date: September 19, 2025 | Last Edited: September 19, 2025

In today’s advanced construction practices, safety is paramount – and nowhere is this more evident than in the field of passive fire protection. With modern buildings becoming more complex and multi-functional, there is an increasing need for innovative solutions that not only enhance structural integrity but also actively contribute to fire safety. In this context, BOSS 813+ Firestop PU Foam has emerged as a game-changing product for architects, façade consultants, fabricators, and installers alike.

Why Boss 813+ Was Developed

Traditional PU foams, while excellent for general sealing and insulation, fall short when it comes to fire-rated applications. Their basic formulations cannot withstand the extreme temperatures encountered during a fire, and in many cases, they may even contribute to flame propagation. Recognising this critical gap, BOSS developed 813+ Firestop PU Foam specifically for passive fire protection – an essential system designed to prevent the spread of fire and smoke through concealed penetrations, joints, and cavities in a building.

Unlike normal PU foams, which may degrade quickly under high heat, BOSS 813+ is formulated with fire-retardant properties and is rigorously tested to comply with EN 1366-4 standards for fire-resistant jointing. It also carries classification per EN 13501-2 by Warrington Exova, ensuring that it delivers reliable fire performance in real-world applications.

*BOSS developed 813+ Firestop PU Foam specifically for passive fire protection*

Applications Across Building Façades, Windows, And Doors

BOSS 813+ Firestop PU Foam is uniquely versatile – it can be used across a wide range of critical applications:

Installation of fireproof doors and windows: Ideal for filling the gaps around frames where fire-rated integrity must be maintained.
Sealing of fire-retardant joints in walls and ceilings: Especially useful in high-rise constructions, where horizontal and vertical compartments must resist fire penetration.
Penetration seals and joints: The foam can be applied to seal service penetrations (such as pipes, cables, or conduits) that pass through fire-rated walls and floors.
Openings in roof constructions: BOSS 813+ is highly effective in closing roof penetrations, offering both fire resistance and weatherproofing.
Acoustic baffles: Its excellent acoustic insulation value makes it suitable for sealing areas where both fire and sound attenuation are required.

*BOSS 813+ Firestop PU Foam has emerged as a breakthrough product for architects, façade consultants, fabricators, and installers*

Key Advantages

What sets BOSS 813+ apart from conventional PU foams is not just its fire resistance, but also its superior application characteristics:

Excellent adhesion: It bonds reliably to a variety of substrates, including concrete, drywall, masonry, and metals – ensuring long-term durability.
Fast curing: The foam cures in less than 60 minutes, allowing for quicker project completion and minimal downtime on site.
Ease of application: It is suitable for complex, difficult-to-reach areas and allows for single-sided installation – saving time and labour. No reinforcing mesh or fabric is required.
Superior insulation: It offers high thermal and acoustic insulation – a key benefit in modern façades that demand energy efficiency and noise control.
High filling capacity: Expands to fill large gaps, ensuring a secure and airtight seal.

Who Is Driving The Demand?

Demand for fire-rated PU foams like BOSS 813+ is rising rapidly, especially in segments such as:

Façade and fenestration systems: Designers and contractors are increasingly required to ensure that all window-to-wall interfaces are sealed with tested firestop systems.
High-rise residential and commercial buildings: In large-scale developments, fire compartmentation is a mandatory design feature – making BOSS 813+ an essential component.
Hospitals, schools, and public infrastructure: These environments require stringent fire and acoustic performance.
Specialised industries: The product is also finding uptake in data centres, airports, and transport hubs, where passive fire protection is a top priority.

BOSS 813+ is certified for up to EI 240 fire resistance - resisting flames and gases for up to four hours — *BOSS 813+ is certified for up to EI 240 fire resistance – resisting flames and gases for up to four hours*

Backed By Certifications

For specifiers and consultants, certification is key. BOSS 813+ has been tested to EN 1366-4 standards, providing up to EI 240 fire resistance in joints – meaning it can resist both flames and hot gases for up to four hours under test conditions. Its classification report (EN 13501-2) from Warrington Exova ensures compliance with the strictest international building codes.

The Conclusion: A Smarter Solution For Safer Buildings

With buildings becoming taller and more complex – and with greater awareness of the risks of fire and smoke migration – the market demand for intelligent, compliant firestop products has never been greater. BOSS 813+ Firestop PU Foam provides a vital answer to this need. By offering a combination of superior fire resistance, ease of use, multi-material compatibility, and insulation performance, BOSS 813+ stands apart from generic PU foams and sets a new standard for passive fire protection in window, door, and façade construction.