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CB‑NV Fire Cavity Barrier
240-Min Fire Integrity
BS 476: Part 4 & 20
Zero GWP · Zero ODP
Asbestos-Free
Product Description
A proven fire barrier for façades and floors
The CB-NV Fire Cavity Barrier uses non-combustible stone mineral wool to stop fire spreading through wall and floor cavities. It holds a Non-Combustibility Rating and keeps its fire-resisting performance even in non-ventilated conditions. In addition, a fire-retardant water-shield layer protects the barrier from moisture exposure.
How the RCS technology works
Two Nine Six O makes CB-NV with exclusive RCS (Rapid Centrifugal Spinning) technology. This process creates a very thin, even fibre structure that thermosetting resins and water repellant bond together. Furthermore, the proprietary Pendulum System builds thinner air layers inside the barrier, so it blocks heat flow more effectively.
Performance and ease of fit
As a result, CB-NV delivers fire integrity for up to 240 minutes in both vertical and horizontal cavity positions. It fits cavities up to 600 mm wide and needs only a simple friction-fit — no adhesives or special tools required.
Key Benefits of the CB-NV Fire Cavity Barrier
🔥 Up to 240-Minute Fire Integrity
Independent labs test CB-NV to BS 476: Part 20 in both vertical and horizontal positions. As a result, it gives proven, long-duration fire compartmentation for façades, floors, and walls.
🧱 Non-Combustible Stone Mineral Wool
CB-NV passes the BS 476: Part 4: 1970 non-combustibility test. Two Nine Six O makes it from inorganic stone mineral wool — not an intumescent foam or flexible sealant.
💧 Moisture & Weather Resistant
A fire-retardant water-shield layer covers CB-NV, so humidity does not change its performance. Furthermore, it resists vermin and fungi for long-term durability on site.
🏗️ Versatile Façade Installation
You can use CB-NV in floors, walls, raised floors, external façades, and weather features. In addition, test teams have checked it with masonry support brackets for complex curtain wall systems.
⚙️ Simple Friction-Fit Installation
No adhesives needed. You press CB-NV onto galvanized impaling L-clips at 450 mm centres. It fits horizontally or vertically, so it reduces installation time on site.
🌿 Zero Harmful Substances
CB-NV contains zero HCHO, zero TVOC, zero Global Warming Potential, and zero Ozone Depletion Potential. It is also 100% asbestos-free, so it is safe for occupants and the environment.
Technical Specifications
| Fire Integrity | Up to 240 minutes — BS 476: Part 20 |
| Reaction to Fire | Non-Combustible — BS 476: Part 4: 1970 |
| Material | Stone Mineral Wool (Non-Combustibility Rating) |
| Thermal Conductivity | k = 0.036 W/m.K |
| Max. Continuous Temp. | 1,000°C continuous · 1,200°C intermittent |
| Tested Cavity Width | Min. 50 mm – 300 mm |
| Design Cavity Width | Up to 600 mm |
| Installation Method | Friction fit — Galvanized Steel Impaling Clips (1.5 mm thick × 50 mm wide) at 450 mm centres |
| Joint Sealing | CB-PP Tape or KM-AL Transition Tape — 25 mm overlap at all butt joints |
| Moisture / Humidity | Unaffected — fire-retardant water-shield layer applied |
| Biological Resistance | Vermin and Fungi Resistant |
| Corrosion Resistance | Chemically stable — resistant to acid, alkaline and weathering |
| HCHO / TVOC | Zero |
| Global Warming Potential | Zero |
| Ozone Depletion Potential | Zero |
| Asbestos | Asbestos-Free |
| Maintenance | No maintenance required once installed |
| Packaging | Shrink-wrapped polythene — pre-cut to project requirements available |
Ideal Applications
- ✓ External façade and curtain wall cavities
- ✓ Floor and slab edge fire compartmentation
- ✓ Wall cavity fire stopping — masonry and framed
- ✓ Under raised-floor cavities
- ✓ Weather feature and rainscreen assemblies
- ✓ Commercial, residential, and industrial buildings
- ✓ Retrofit and renovation fire upgrading works
- ✓ Assemblies with masonry support brackets
Zero Harmful Emissions
CB-NV carries an outstanding environmental profile. It contains no harmful chemicals, and it has no impact on global warming or ozone depletion.
Compliance & Testing Standards
Non-Combustibility Test
An independent lab tests CB-NV to BS 476: Part 4: 1970. As a result, it earns a non-combustible rating — it does not burn and does not feed a fire.
Fire Resistance — Up to 240 Minutes
BS 476: Part 20 measures how long a product resists fire. CB-NV reaches up to 240 minutes in both vertical and horizontal positions, so it suits the most demanding projects.
Works with Masonry Brackets
Test teams have checked CB-NV alongside masonry support brackets. Therefore, it fits complex façade builds that use structural fixings without losing fire performance.
Installation Guide — 6 Steps
Follow these six steps to install CB-NV correctly, in line with the manufacturer’s specification and BS 476 test conditions.
Verify Joint Width
First, measure the joint width between the façade setting-out line and the masonry wall or slab. This tells you which CB-NV thickness to order.
Mark-Out Barrier Line
Next, draw the horizontal line for the CB-NV barrier on the substrate. Follow the approved layout drawing to make sure the position is correct.
Fix Impaling L-Clips
Then fix galvanized L-clips (1.5 mm × 50 mm) at intervals no greater than 450 mm centre-to-centre. Fix all clips firmly to the substrate before moving on.
Install CB-NV Barrier
After that, hold the CB-NV barrier flat and push it firmly onto the impaling L-clips. It should sit in a snug friction fit across the full width of the cavity.
Seal Interfacing Joints
Where two CB-NV barriers meet, apply CB-NV PP Tape with at least a 25 mm overlap. This seals every joint and keeps the fire protection continuous.
Install Façade Panels
Finally, fit the façade cladding panels to cover and protect the CB-NV fire barrier system. This completes the installation.
Installation training and site inspections are available. Contact contact@t2960.com.sg to arrange on-site support from the specialist team in Singapore.
Frequently Asked Questions
What fire rating does the CB-NV Fire Cavity Barrier achieve?
CB-NV reaches up to 240 minutes of fire integrity when teams test it to BS 476: Part 20. This rating covers both vertical and horizontal cavity positions. However, the exact result depends on how the external wall system is built.
Is the CB-NV cavity barrier non-combustible?
Yes. CB-NV passes the BS 476: Part 4: 1970 non-combustibility test. Two Nine Six O makes it from stone mineral wool, so it does not burn or add to a fire.
What cavity widths is the CB-NV suitable for?
CB-NV works in cavities from 50 mm to 300 mm wide (tested range). Moreover, the design supports cavities up to 600 mm wide. In all cases, you press it into place by hand — no glue or tools needed.
How is the CB-NV Fire Cavity Barrier installed?
Follow six steps: first, check the joint width. Next, mark the barrier line. Then fix galvanized L-clips at max. 450 mm centres. After that, push CB-NV onto the clips. Furthermore, seal all joints with CB-NV PP Tape at 25 mm overlap. Finally, fit the façade panels to finish.
Where can the CB-NV Fire Cavity Barrier be used?
You can use CB-NV in floors, walls, under raised floors, external façades, and weather features. It works in both vertical and horizontal positions. In addition, test teams have confirmed it works with masonry support brackets for complex façade builds.
Is CB-NV affected by moisture or weather?
No. A fire-retardant water-shield layer covers CB-NV, so humidity does not change its performance. Furthermore, it resists vermin, fungi, acids, and alkaline chemicals — making it reliable in tough outdoor conditions.
What are the environmental credentials of CB-NV?
CB-NV contains zero HCHO and zero TVOC. In addition, it has zero Ozone Depletion Potential and zero Global Warming Potential. As a result, it carries an outstanding eco profile. It is also 100% asbestos-free.
Does CB-NV require ongoing maintenance?
CB-NV needs no maintenance after you install it. However, if you plan any changes to the installed system, you must tell the specialist contractor first so they can check the fire protection stays intact.
What clips and tape do I need for installation?
Use Galvanized Steel Impaling Clips (1.5 mm thick × 50 mm wide) at 450 mm centres. Then seal every butt joint with CB-PP Tape or KM-AL Transition Tape at a 25 mm overlap. This ensures an airtight seal across the whole barrier.
Specify CB-NV for Your Project
Request a technical review, pre-cut sizing, or site inspection — Singapore.
