Siderise TW Cavity Barrier and Firestop for Tops of Walls

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 600mm dependent 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 2 and 3, respectively.

Siderise TW has been Third-Party tested and classified as A1 to EN 13501-1. Please see Table 1 for further information.

*Please note that the thickness declared here refers to reaction to fire testing (supported by certificates - WHI-09/02-22-000001-03 (UK) & WHI20-32944302 (US)) carried out on the base material from which TW is manufactured  and so covers a wider range than the thicknesses used for TW resistance to fire testing shown in Table 2.

The design and manufacture of Siderise TW is based on fire resistance testing in general accordance EN 1366-4:2006 + A1:2010.

** Whilst some void widths of TW have been tested in general accordance with EN 1366-4 without mechanical fixings and brackets, we note that some supervising authorities may require a form of mechanical fixing. We recommend engaging with the project supervising authorities prior to installation to ensure all their requirements are met.

• Brackets must be installed at 600mm centres based on a 1200mm strip, This can be reduced pro rata for shorter lengths. Please note that a minimum of 2 brackets are required for any length of barrier greater than 250mm. For lengths ≤250mm a single bracket must be utilised.
• All brackets to be suitably fixed to substrate with non-combustible fixings
• All brackets to penetrate product at mid-thickness.
• All brackets to penetrate to a depth of 75% of gap width.  

Siderise firestops for tops of walls  can help to reduce room-to-room sound transmission. 

The installation of the products above a partition will contribute to room-to-room sound insulation performance. The achievable performance will depend on the construction of the wall and ceiling. Please contact our Technical Services department for further guidance around using this product.

Table 3 confirms the laboratory tested values for Weighted Sound Reduction Index (dB Rw) in accordance BS EN ISO 10140-2:2021; Acoustics-Laboratory measurement of sound insulation of building elements, Part 2: Measurement of airborne sound insulation.

Rw is the weighted sound reduction index.  It is a laboratory measured value to identify the airborne sound insulation performance of a building element.  It is used for internal or external walls, ceilings/floors, windows, doors, or any separating element.  The higher the Rw value, the better that element performs in reducing sound transmission.

Please note that the values presented in the above table refer to the standalone performance of the Siderise products only.

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

Siderise TW Firestops for Tops of Walls

The stone wool core is recyclable

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

• Material Data Sheet 
• NBS Specification Clause 

For technical advice or support please contact: [email protected] 
 

For Installation Training or Site Inspections please contact: [email protected]

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.