Siderise EW Closed State Cavity Barrier and Firestop

Siderise EW Systems have been developed to provide a tested method of sealing external wall cavities to provide resistance to the passage of fire in external masonry constructions.

The EW product range is for use as a Cavity Barrier or Firestop in accordance with the guidance supporting the national Building Regulations.

Friction fit installation is available throughout the range to support installation with ‘green’ brickwork, which brings considerable advantages to the construction timeline.

In addition to providing an effective seal against the passage of fire, the products are also acoustically absorptive.

These products represent an ideal combination of fully qualified performance and practical installation. 3rd party product approval is provided by IFC Certification (IFCC 1830).

CCPI assessed status

EW Closed State Cavity Barrier and Firestops products have been assessed under the CCPI scheme. 

Assessment Number: 000800104/1126

Siderise EW systems are manufactured using a unique method that provides resilient lateral compression. This facilitates installation, ensuring the requisite tight fit and enhancing the fire integrity of the product.

Throughout the range, the materials comprise a one-piece product with a pre-compressed non-combustible stone wool core. The products also have integral aluminium foil facings to provide an overall Class A1 rating (To BS EN 13501-1:2018).

Available in the following forms:

Pre-cut Strips

• Pre-cut products are available in 1mm increments of width to suit the cavity size. 
• Supplied with appropriate brackets when part of  the system.

Sheets

• Standard sheet size is 1200 x 1200mm and may be of benefit when the actual void size is not known or to accommodate site tolerance (where the void may vary significantly).
• Appropriate brackets must be ordered separately.

Siderise EW should be installed in accordance with PD6697:2019 - 'Recommendations for the design of masonry structures to BS EN 1996-1-1 and BS EN 1996-2'.

• Horizontal - EW must be installed with a suitable cavity tray located above.
• Vertical - EW must be installed with a DPC extending a minimum of 25mm into the cavity on either side. DPC to be sourced separately. If requested by Building Control / Warranty provider the DPC can be optionally secured with Siderise RFT 120/45 foil tape.

Reaction to Fire

This is the response of a material in contributing by its own decomposition to a fire to which it is exposed under specified conditions. Results are classified to BS EN 13501-1:2018 “Fire classification of construction products and building elements”.

Siderise EW Systems are classified as A1 to BS EN 13501-1:2018. This is detailed further in Third-party certification with Intertek. 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 EW is manufactured and so covers a wider range than the thicknesses used for EW resistance to fire testing shown in table 2 and 3.

Resistance to Fire 

This is the ability of an element of structure or product to maintain its stability for a specific period as determined by the loadbearing capacity (for structural elements only), integrity and/or insulation against heat transfer specified in the fire resistance test. Results are given in accordance with BS EN 13501-2:2023.

Siderise EW Systems have been tested in accordance with BS EN1366-4:2006 + A1:2010 and BS EN 1366-4: 2021(Only applies to EW-FS60 for horizontal voids 51-250mm, EW-FS60 for vertical voids 251-400mm and EW-FS120 horizontal voids with MSA – 250mm). 

Siderise EW Systems maintained integrity (E) and insulation (I) requirements as detailed in Tables 2-3. 3rd party product approval is provided by IFC Certification (IFCC 1830).

* BS EN 1366-4: 2021(Only applies to EW-FS60 for horizontal voids 51-250mm, EW-FS60 for vertical voids 251-400mm and EW-FS120 horizontal voids with MSA – 250mm). 

*Siderise has undertaken additional testing with EW-FS120 which includes masonry support angles (MSA) penetrating the system. For more information on these tests please refer to IFCC 1830 or contact technical.services@siderise.com

(1) In this test specimen the MSA penetrates the product and protrudes from the unexposed face by 18mm

(2) In this test specimen the MSA penetrates the product and is finished flush with the unexposed face and protrudes the exposed face by 15mm

(3) In this test specimen the MSA penetrates the product by 50% and protrudes the exposed face by 75mm

• All brackets are to be suitably fixed to the substrate with non-combustible fixings, or mortared into masonry coursing.
• All brackets to penetrate product at mid-thickness.
• All brackets to penetrate to a depth of 75% of gap width.
• Brackets are available in two forms: (G) denotes galvanised steel brackets and (S) denotes stainless steel brackets.
• Brackets must be installed at 600mm centres based on a 1200mm strip. This can be reduced pro rata for shorter lengths. Please note that 2 brackets are required for any length of barrier greater than 250mm. For lengths ≤250mm a single bracket can be utilised.
• Whilst the EW range has been tested in general accordance with BS EN 1366-4:2006+A1:2010 “Fire resistance tests for service installations - Linear joint seals.” 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.

Friction Fit - product should be sized equal to the void width and installed with no gaps.

Compression Fit - the product should be sized to the void width plus a minimum of +10mm or 10% compression (Please see Tables 2 & 3). Care should be taken when installing under compression to ensure mortar has cured adequately to prevent deformation of the masonry outer leaf.

Please refer to the EW Installation Instructions (available for download from our website) for more information.

When considering Steel Frame Systems (SFS) the supporting substrate should be capable of providing support to the barrier for the required period of fire resistance. For other void sizes or additional advice, please contact Technical Support.

Due to the way cavity masonry façades typically interface with floor slabs it is not usual to rely on elements within the cavity to control flanking noise transfer between floors.

Flanking performance for masonry façades is typically controlled by internal finishes such as high mass plasterboard linings. 

Table 4 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.

An 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.

Please contact technical.services@siderise.com for project specific guidance relating to acoustic performance in masonry applications.

Thermal conductivity : λ = 0.038 W/m.K ±5% (tested foil to foil) to BS EN 12667: 2001

Damp Proofing
Siderise EW must be damp-proofed in accordance with PD6697:2019 - 'Recommendations for the design of masonry structures to BS EN 1996-1-1 and BS EN 1996-2'.

Siderise EW - Cavity Barriers and Fire Stops

Siderise offers a range of ancillary products to complement the EW range these include:

Fixing Brackets must be used when required for the installation of the product.

Brackets come in two forms: 'G' - Galvanised Steel Brackets and 'S' - Stainless Steel Brackets.

Brackets are supplied with all EW in strip form, but must be ordered separately for all EW in sheet form.

Aluminium Jointing Tape must be used at all joints and intersections:

• RFT120/45 (120mm wide x 45m rolls)
• Adhesive backed
• Supplied in boxes of 8

The stone wool core is recyclable. 

The following information is available for download via the website:

• Third-party Certification - IFCC 1830
• Standard Details
• NBS Specification Clauses
• Installation Instructions
• Material Data Sheet

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.