Siderise EWI Systems have been specially developed with the incorporation of an integral intumescent, which in the event of a fire, provides a reactive method of sealing masonry wall cavities that have an irregular inner face to the outer masonry leaf such as decorative features.

Siderise EWI systems are currently available for horizontal applications as Cavity Barriers or Firestops (dependent on application) in accordance with the guidance supporting the national Building Regulations.

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

Where there is a vertical cavity barrier requirement, our Siderise EW vertical full fill barriers should be used in conjunction with the EWI horizontal open-state barriers in masonry wall applications.

The suitability of this product should be checked with the relevant building control and warranty provider for the project.

Siderise EWI Systems comprise of a stone wool insulation core which is pre-compressed internally to form a resilient strip. The material is faced on two sides with a reinforced aluminium foil which provides an effective fire barrier once the product has activated and fully sealed the void. Siderise EWI incorporates an integral reactive intumescent. The leading edge is encapsulated in a white polymer film.

Siderise EWI is only supplied in pre-cut strips:

• Pre-cut products are available in 1mm increments of width to suit the cavity size. Please see the technical datasheet.
• Supplied with appropriate brackets as part of a system. Please see the technical datasheet.

Siderise EWI 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'.

If Siderise EWI is in contact with the outer masonry (thereby bridging the cavity), it must be installed with a Cavity Tray directly above. Where there is no contact with the outer masonry leaf (i.e. a continuous uninterrupted air gap) a cavity tray may no longer be required depending on the specific project requirements, except where otherwise called for such as above openings. Please refer to 3rd party warranty providers, such as NHBC, LABC and Premier Guarantee for further guidance.

Features and benefits:

• Third-party certified: The performance of EWI Cavity Barrier and Firestop is IFC Certified (IFCC 1830).
• For cavities up to 400 mm: EWI Cavity Barrier and Firestop has been tested for cavity widths up to 400 mm in a horizontal application allowing for air gaps up to 25 mm. Additionally, a 50 mm air gap offering is available for voids up to 300 mm. 
• Up to 2 hours fire resistance: EWI Cavity Barrier and Firestop has been tested in accordance with ASFP Technical Guidance Document (TGD) 19 Fire resistance test for 'open-state' cavity barriers used in the external envelope or fabric of buildings.
• Accommodates decorative features: The integral intumescent in the EWI Cavity Barrier and Firestop allows irregular cavity depths caused by decorative offset brickwork to be effectively protected, with no need to try and accurately notch standard cavity barriers onsite. 
• Used with EW Cavity Barrier and Firestop: This horizontal cavity barrier and firestop solution should be installed in conjunction with EW Cavity Barrier and Firestop for vertical applications.