Siderise TW Cavity Barrier and Firestop for Tops of Walls
Firestops designed to ensure compartmentation at the tops of compartment walls
Continue compartmentation
TW Cavity Barrier and Firestop is designed for use within the joint between the top of compartment walls, partitions or fire-resistant suspended ceilings and the structural soffit. It features Lamella insulation comprising durable vertically oriented stone wool fibres which have been laterally pre-compressed under factory-controlled conditions and held with aluminium foil facings for reliable compartmentation and acoustic benefits.
TW Cavity Barrier and Firestop is available in a variety of size options to cover gap heights between 20 – 400 mm, all with EI 30 to 120 options in accordance with BS 476-20
The product provides tested acoustic performance with Weighted Sound Reduction Index values as low as 25 Rw (dB), helping to reduce room-to-room sound transmission
The flexibility of the Lamella insulation core and its compression fit means it can flex and recover in line with any building movement
Siderise firestops for tops of walls provide a seal between the top of the compartment wall, partition, or fire-resistant suspended ceiling, and the structural soffit. The choice of material is determined by the performance requirement in terms of fire resistance (i.e. insulation and integrity) and size of the cavity.
Uses include:
- Fire-stopping voids above compartment walls and partitions up to 400mm dependant on fire performance
- As an acoustic barrier at tops of walls
Siderise firestops for tops of walls comprise a single, close dimensioned product with a unique pre-compressed internal stone wool mineral fibre lamella core.
The materials are manufactured using a unique manufacturing process to provide a resilient compression which ensures a tight fit. They are either supplied as pre-cut units to suit a quoted cavity size or in sheet form for cutting on site.
The range of Siderise firestops for tops of walls includes various types of products which are referenced ‘TW’ to designate the ‘Tops of Walls’ application. The materials have been developed and tested at various thicknesses to meet the fire and acoustic performance requirements listed in Tables 1 and 3.
In terms of ‘Reaction to Fire’, the products provide the following:
- Class ‘A1’, in accordance with EN13501-1
The design and manufacture of the range of Siderise firestops for tops of walls is based on proven fire performance to BS 476 : Part 20 :1987.
Please note that Siderise firestops for tops of walls can be supplied for higher fire ratings and for voids greater than 400mm, up to 1200mm.
The products have integral aluminium foil facings and are a functional smoke barrier.
Table 1 - Fire performance and product sizes
| Product Ref | Void Width (mm) | Thickness (mm) | Compression (min.) | Integrity (Mins) | Insulation (mins) | Product Length (mm) |
|---|---|---|---|---|---|---|
|
TW-CB30 |
20 - 50 |
75 |
Gap Width +10mm |
30 |
30 |
1200 |
|
TW-FS60 |
20 - 50 |
90 |
Gap Width +10mm |
60 |
60 |
1200 |
|
TW-FS120 |
20 - 50 |
120 |
Gap Width +10mm |
120 |
120 |
1200 |
|
TW-CB30 |
51 - 100 |
75 |
Gap Width +5mm |
30 |
30 |
1200 |
|
TW-FS60 |
51 - 100 |
90 |
Gap Width +5mm |
60 |
60 |
1200 |
|
TW-FS120 |
51 - 100 |
120 |
Gap Width +5mm |
120 |
120 |
1200 |
|
TW-CB30 |
101 - 400 |
75 |
Gap Width +10mm |
30 |
30 |
1200 |
|
TW-FS60 |
101 - 400 |
90 |
Gap Width +10mm |
60 |
60 |
1200 |
|
TW-FS120 |
101 - 400 |
120 |
Gap Width +10mm |
120 |
120 |
1200 |
NB: For bracket type and size please refer to Table 2
Table 2 - Fixing brackets
| Bracket Ref. | Min. Void Size (mm) | Max Void Size (mm) | No. of Brackets | Bracket Centres (mm) |
|---|---|---|---|---|
|
B65/110 |
50 |
150 |
2 |
600 |
|
B195 |
151 |
240 |
2 |
600 |
|
B355 |
241 |
400 |
2 |
600 |
Siderise firestops for tops of walls provide excellent acoustic performance and can help to reduce room-to-room sound transmission. Their high performance is attributable to the mass of the stone wool core and the unique resilient lamella internal construction.
In accordance with BS EN ISO 140-3: 1995, BS 2750: Part 3: 1995 the Weighted Sound Reduction Index (Rw) values shown in Table 3 can be used.
These are based on laboratory tests for airborne sound transmission on a variety of lamella board constructions.
The installation of the products above a partition will significantly increase room-to-room attenuation. The precise value will depend upon the specifics of the ceiling construction. Advice is available on a project basis.
Table 3 - Acoustic Performance (Weighted Sound Reduction Index)
| Product Type | Thickness (mm) | Rw (dB) |
|---|---|---|
|
TW-CB30 |
75 |
21 |
|
TW-FS60 * |
90 |
22 |
|
TW-FS120 |
120 |
25 |
* =Rw value interpolated from test results
Sound Research Laboratories Limited test report no. : C/99/SL/7743/I refers
Thermal conductivity : λ = 0.038 W/m.K (tested foil to foil)
Siderise TW Firestops for Tops of Walls
Table 4: Product properties
| Properties | Value |
|---|---|
| Form supplied | Sheets 1200mm x 1200m x thickness, Cut strips 1200mm x cavity + compression x thickness, See Table 1 |
| Colour | Silver, with coloured identification tape centrally located on product |
| Finish | Aluminium foil |
| Density | Nominal 75 kg/m3 |
| Thermal conductivity | λ= 0.038 W/m.K (tested foil to foil) |
| Cavities | 20mm to 400mm |
| Reaction to Fire | Class ‘A1’ to EN 13501-1 |
| Resistance to Fire | 30 to 120 minutes (integrity/insulation) |
The stone wool core is recyclable
The following information is available upon request or via download from the website:
- NBS Specification Clause
- Material Safety Data Sheet
- Cutting and Installation instructions
For technical advice or support please contact: technical.services@siderise.com
For Installation Training or Site Inspections please contact: site.services@siderise.com
The information in this datasheet is believed to be accurate at the date of publication. Siderise has a policy of continuous product improvement and reserves the right to alter or amend the specifications of products without prior notice. Siderise does not accept responsibility for the consequences of using the products described outside of the recommendations within this datasheet. Expert advice should be sought where there is any doubt about the correct specification or installation of Siderise products.
Spec ID 55890 - Intertek US - Third-party Certification (EN 13501-1:2018)
Products
Ancillaries
Single source supply components for compatibility, performance and confidence
FAQs
Get quick answers to common queries or contact our team for more advice. Your questions answered.
TW Cavity Barrier and Firestop can be supplied pre-cut or as a sheet for cutting onsite
It can achieve thermal conductivities of 0.038 W/m.K (tested foil to foil)
We can manufacture bespoke sizes of TW Cavity Barrier and Firestop to protect voids up to 1,200mm. Please contact our technical services team with your project details for more information
Case Studies
Related projects
Siderise is a market leader in the design and development of specialist passive fire.
Contact us
We're here to help you
Call for our main switchboard
Email us for technical enquiries
Email us for site support
Complete the form for the right response
Augmented Reality
Point your camera at the QR code. Tap the banner that appears on your screen.