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Siderise EW Closed State Cavity Barrier and Firestop

Cavity barriers and firestops to protect compartment lines and around openings in masonry walls

Closed state cavity barrier and firestop 

EW Cavity Barrier and Firestop provides effective compartmentation in external masonry walls, with friction fit options available for cavities up to 350mm. The product features a Lamella insulation core comprising durable vertically oriented stone wool fibres compressed under factory-controlled conditions and held in place with aluminium foil facings heat-bonded to the cut face of the fibres. Lamella is key to accommodating site tolerances and localised common imperfections in brickwork. 

Easy to install

The product design makes it easy to install, with fixing brackets and jointing tape all supplied by Siderise as part of a complete package. Friction fit options for EW-CB30 and EW-FS120 for voids for up to 350mm means products do not need to be installed with compression and can be applied to wet brickwork without compromising the stability the wall structure

Accommodates penetrations

The stone wool Lamella composition allows EW Cavity Barrier and Firestop to be effortlessly notched. This means components commonly interrupting the firestopping line e.g. masonry support brackets, can be easily accommodated

Third-party tested and certified

Testing to EN1366-4 and third-party certification through IFC 1830 covers both horizontal and vertical applications and incorporates fixing brackets and aluminium foil jointing tape

Tested and certified for cavities up to 450mm

To suit specific cavity barrier and firestop specification requirements, EW Cavity Barrier and Firestop is available with fire resistance performance ratings ranging from 30mins to 120 mins for 20mm voids (horizontal and vertical), up to 350mm voids (horizontal) and  450mm voids (vertical)

Tested with masonry supports and DPCs

To demonstrate compatibility and provide assurance that performance is not compromised, EW Cavity Barrier and Firestop incorporating DPCs has been tested to EN 1366-4, and EW-FS120 has been tested with masonry support angles with differing levels of penetrations

External masonry wall cavity barrier and firestop systems

Closed state fire protection solutions for masonry constructions 

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Application

Siderise EW Systems have been developed to provide a simple and easy to install method of sealing external wall cavities for fire and smoke 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.

In addition to providing an effective seal against the passage of smoke and fire, the products are also acoustically absorptive. Please note, EW-FS60 is only available with a compression fit and is unsuitable for green brickwork. Care should be taken when installing under compression to ensure mortar has cured adequately to prevent deformation of the masonry outer leaf.
 

These products represent an ideal combination of fully qualified performance and practical installation.

Siderise EW Systems have Third-party Certification through IFCC 1830.

Product Description

Siderise EW Systems comprise of a low resin content stone wool insulation core which is pre-compressed internally to form a resilient strip. The material is faced on two sides with reinforced aluminium foil which is an effective smoke barrier. Available in the following forms:

Pre-cut Strips

  • Pre-cut products are available in 1mm increments of width to suit the cavity size. Please see Table 2 regarding 'fit type'.
  • Supplied with appropriate brackets as part of a system.

Sheets

  • Standard sheet size is 1200 x 1200mm and may be of benefit when the actual void size is not known or where it varies 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 immediately 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.

 

Fire Performance

Siderise EW Systems have Third-party Certification with Intertek and are classified as A1 to EN 13501-1. Please see Table 1 for further information.

Table 1: Reaction to Fire Performance

Properties Value
Classification A1 to EN 13501-1
Certificate No. WHI-09/02-22-000001-02 (UK)
WHI20-32944302 (US)
Thickness Range 50-175mm
Substrates Mechanically fixed to gypsum or any other A1 or A2-s1, d0 substrate
Joints With or without joints

Siderise EW Systems have been tested in accordance with EN1366-4:2006 + A1:2010. Siderise EW Systems maintained integrity (E) and insulation (I) requirements as detailed in Tables 2-3.
 

IFC certification (IFCC 1830) has also been achieved for horizontal and vertical applications.


Table 2: Resistance to Fire to EN1366-4 (Horizontal)

Product Ref Void Width (mm) Thickness (mm) Compression (min.) Integrity (Mins) Insulation (mins) Product Length (mm) Bracket Requirement Third-party Certification
EW-CB30
20 - 50
75
Gap Width + 10%
120
30
1200
None.
IFCC 1830
EW-CB30
51 - 150
75
Friction
90
30
1200
2no.B65/110 600mm centres
IFCC 1830
EW-CB30
151 - 250
75
Friction
90
30
1200
2no.B195 600mm centres
IFCC 1830
EW-CB30
251 - 350
75
Friction
90
30
1200
2no.B355 600mm centres
IFCC 1830
EW-FS60
20 - 50
90
Gap Width + 10%
90
60
1200
None.
IFCC 1830
EW-FS60
51 - 150
90
Gap Width +10mm
90
60
1200
2no.B65/110 600mm centres
IFCC 1830
EW-FS60
151 - 240
90
Gap Width +10mm
90
60
1200
2no.B195 600mm centres
IFCC 1830
EW-FS60
241 - 300
90
Gap Width +10mm
90
60
1200
2no.B355 600mm centres
IFCC 1830
EW-FS120
20 - 50
120
Friction
120
120
1200
None.
IFCC 1830
EW-FS120
51 - 150
120
Friction
120
120
1200
2no.B65/110 600mm centres
IFCC 1830
EW-FS120
151 - 250
120
Friction
120
120
1200
2no.B195 600mm centres
IFCC 1830
EW-FS120
251 - 350
120
Friction
120
120
1200
2no.B355 600mm centres
IFCC 1830
EW-FS120 with MSA*(1)
250 (Tested)
120
Friction
120
120
1200
2no.B355 600mm centres
IFCC 1830
EW-FS120 with MSA*(2)
250 (Tested)
120
Friction
120
120
1200
2no.B355 600mm centres
IFCC 1830
EW-FS120 with MSA*(3)
250 (Tested)
120
Friction
120
120
1200
2no.B355 600mm centres
IFCC 1830

*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

Table 3: Resistance to Fire to EN1366-4 (Vertical)

Product Ref Void Width (mm) Thickness (mm) Compression (min.) Integrity (Mins) Insulation (mins) Product Length (mm) Bracket Requirement Third-party Certification
EW-CB30
20 - 50
75
Gap Width + 10%
120
30
1200
None.
IFCC 1830
EW-CB30
51 - 150
75
Friction
120
30
1200
2no.B65/110 600mm centres
IFCC 1830
EW-CB30
151 - 250
75
Friction
120
30
1200
2no.B195 600mm centres
IFCC 1830
EW-CB30
251 - 350
75
Friction
120
30
1200
2no.B355 600mm centres
IFCC 1830
EW-CB30
351 - 450
75
Gap Width +10mm
120
30
1200
2no.B355 600mm centres
IFCC 1830
EW-FS60
20 - 50
90
Gap Width + 10%
90
60
1200
None.
IFCC 1830
EW-FS60
51 - 150
90
Gap Width +10mm
90
60
1200
2no.B65/110 600mm centres
IFCC 1830
EW-FS60
151 - 240
90
Gap Width +10mm
90
60
1200
2no.B195 600mm centres
IFCC 1830
EW-FS60
241 - 450
90
Gap Width +10mm
90
60
1200
2no.B355 600mm centres
IFCC 1830
EW-FS120
20 - 50
120
Friction
120
120
1200
None.
IFCC 1830
EW-FS120
51 - 150
120
Friction
120
120
1200
2no.B65/110 600mm centres
IFCC 1830
EW-FS120
151 - 250
120
Friction
120
120
1200
2no.B195 600mm centres
IFCC 1830
EW-FS120
251 - 350
120
Friction
120
120
1200
2no.B355 600mm centres
IFCC 1830
EW-FS120
351 - 450
120
Gap Width +10mm
120
120
1200
2no.B355 600mm centres
IFCC 1830
  • 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.

Friction Fit - product should be sized equal to the void width and installed with no gaps.
Please note product supplied in strip form will have a -0mm/+4mm tolerance.

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 see separate 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.

Acoustic Performance

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. Siderise EW is not designed with acoustic applications in mind, however as a stonewool product it naturally has some sound absorbing properties.

Please contact our technical department for project specific guidance relating to acoustic performance in masonry applications.

Thermal Performance

Thermal conductivity : λ = 0.038 W/m.K ±5% (tested foil to foil) to 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'. 


 
Technical Specification

Siderise EW - Cavity Barriers and Fire Stops

 

Table 4: Product Properties

Properties Value
Reaction to fire Classification to EN 13501-1: 'A1' Please see Table 1
Resistance to fire 30 to 120 minutes, please see Table 2 & 3
Thermal Conductivity λ = 0.038 W/m.K ±5% (tested foil to foil) to EN 12667: 2001
Chemical Properties The base stone wool is chemically inert. An aqueous extract of the rock wool is neutral (pH7) or slightly alkaline. Resistant to most acids and weak alkaline solutions.
Biological Properties Vermin and root proof and does not encourage the growth of fungi, moulds, or bacteria.
Effect of Water Non-hygroscopic. Unaffected by humid atmosphere. Must be suitably damp proofed in accordance with codes of practice when used in masonry applications.
Compatibility Compatible with all normal building materials.
Maintenance No maintenance required unless disturbed.
Handling Easy to handle but should be treated with due care to ensure material integrity and shape are maintained.
Storage Store in dry conditions and protect from mechanical damage.

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

Fixing Brackets must be used in 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
Environmental

The stone wool core is recyclable. 


Additional Information Available

The following information is available for download via the website:

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

 
 

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FAQs

Get quick answers to common queries or contact our team for more advice. Your questions answered.

Do you offer product installation training?

Yes, our site services engineers combine classroom learning with toolbox training and includes mock-up benchmark installations, free-of-charge.

Is EW Cavity Barrier and Firestop supplied pre-cut?

Pre-cut products are available in 1mm increments of width to suit the cavity size. We can also supply standard 1200 x 1200mm sheets where the exact void is not known

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