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Siderise TW - Firestops for Tops of Walls – Technical Data

Version: 1.01 - Release Date: October 2021

Application

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

Product Description

Siderise firestops for tops of walls comprise a single, close dimensioned product with a unique pre-compressed internal stonewool 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.

Fire Performance

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.  
 
In terms of ‘Reaction to Fire’, the products provide the following: 
  • Class ‘A1’, in accordance with EN13501-1

Table 1 - Fire performance and product sizes

Gap Height (mm)  Product Type Seal Height x Thickness (mm) Performance to BS 476: Part 20 Cover Length (mm) 
Integrity (mins) Insulation (mins) 
20 to 50 TW-CB30 Gap + 10 x 75 30 30 1200 
 TW-FS60 Gap + 10 x 90 60 60 1200 
 TW-FS120 Gap + 10 x 120 120 120 1200 
51 to 100 TW-CB30 Gap + 5 x 75 30 30 1200 
 TW-FS60 Gap + 5 x 90 60 60 1200 
 TW-FS120 Gap + 5 x 120 120 120 1200 
101 to 400 TW-CB30 Gap + 10 x 75 30 30 1200 
 TW-FS60 Gap + 10 x 90 60 60 1200 
 TW-FS120 Gap + 10 x 120 120 120 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 

Acoustic Performance

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 mineral fibre 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 Performance

Thermal conductivity : λ10 = 0.038 W/m.K (tested foil to foil)

Technical Specification

Siderise TW Firestops for Tops of Walls

Table 4: Product properties

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 λ20= 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) 

Environmental

Siderise Firestops for tops of walls are environmentally friendly. 

  • They contain no Volatile Organic Compounds (VOCs) and no very Volatile Organic Compounds (vVOCs). 
  • Zero Ozone Depleting Potential 
  • Zero Global Warming Potential 
  • Recyclable

Additional Information

The following information is available upon request or via download from the website: 

  • NBS Specification Clause 
  • Material Safety Data Sheet 
  • Cutting and Installation instructions

Technical Support

For technical advice or support please contact: technical.services@siderise.com 

For Installation Training or Site Inspections please contact: site.services@siderise.com

Context

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.

 
 
Published Version: TW _v1_01_20211027_142