Cavity Barrier, Siderise RH Ventilated Cavity Barrier

Application:

• Siderise RH ‘Open State’ horizontal cavity barriers have been specifically developed to meet the requirements for cavity barriers used in drained and ventilated façades. Their use ensures that the system will drain any moisture within the façade construction whilst maintaining airflow and, in the event of fire, provide an effective fire seal.
• Siderise has developed two ‘Open State’ (open void) horizontal solutions: RH25 for air gaps up to 25 mm and RH50 for air gaps up to 50 mm.
• The product range is compliant with current market requirements and has been tested to ASFP Guidance: ’Open State’ Cavity Barrier used in External Envelope or Fabric of Buildings, utilizing principles of EN 1363-1. ASFP Technical Guidance Document –TGD 19 (July 2014 revised Nov 2017) refers.

Third party certification:

• Siderise was the first manufacturer to achieve Third-Party Certification for Rainscreen Cavity Barriers. 
• For current details of Siderise certified 'Open State' Cavity Barriers, including the testing and scope of our Third-Party Certification, please refer to IFC Certification IFCC 1712. 
• This Certificate is available from our online Technical Resources or by contacting our Technical Support department: technical.services@siderise.com. 

Siderise RH ‘Open State’ horizontal cavity barriers comprise a non‑combustible stone wool lamella core with reinforced aluminium foil facings. The primary seal has a reaction to fire classification of Class A1. The exposed leading edge is also sealed with aluminium foil.

The stone wool core is water repellent and non‑hygroscopic. In this predominantly enclosed configuration, the barrier provides additional protection to the core material under normal service conditions.

RH ‘Open State’ horizontal cavity barriers incorporate a continuous reactive intumescent strip bonded to the leading edge. The intumescent material has a reaction to fire classification of Class E. In the event of exposure to fire, the intumescent expands to seal the ventilation gap formed between the barrier and the rear face of the cladding at the time of installation.

The range includes products for nominal air gaps of 25 mm (RH25) and 50 mm (RH50). Both options are available with either galvanised mild steel (G) or stainless steel (S) fixing brackets as part of the system, designated RH25G, RH25S, RH50G and RH50S. Bracket selection is typically determined by the rainscreen system designer in relation to project exposure and location.

The leading edge of the horizontal cavity barrier is encapsulated in a weather‑resistant polymer film. As standard, the film is black to provide a shadow‑line appearance behind open‑joint cladding.

For product identification, the upper edge of the film on RH25 and RH50 cavity barriers is colour‑coded and labelled to indicate the product fire performance rating.

Features and benefits:

• RH 'Open State' Cavity Barriers are IFC Certified (IFCC 1712)
• RH 'Open State' Cavity Barriers allow continuous ventilation and drainage behind the rainscreen envelope
• RH 'Open State' Cavity Barriers are tested to ASFP TGD19 ‘Fire Resistance Test of Open State Cavity Barriers’ utilizing BS EN 1363-1 and Principles of BS EN 1366-4
• RH 'Open State' Cavity Barrier - (RH25-120/120). provides up to 120 minutes' fire integrity and 120 minutes insulation.
• Suitable for horizontal (open void) applications
• All RH 'Open State' horizontal cavity barriers are colour-coded for ease of identification.

Fire performance:

• Siderise ’Open State’ horizontal cavity barriers have been tested in accordance with ASFP TGD19 (prEN 1364-6): ’Open State’ Cavity Barrier used in External Envelope or Fabric of Buildings. This test method specifies a procedure for determining the fire resistance of ’open state’ cavity barriers when subjected to the standard fire exposure conditions and performance criteria stipulated in EN 1363 Part 1: 2012.
• The tests have been undertaken to assess the ability of the horizontal ’open state’ cavity barrier products to reinstate the fire resistance of a pre-cast, aerated concrete supporting construction. This is the standard assembly for testing such cavity barrier products as it allows the performance of the individual barrier to be classified.
• Siderise advise that all ‘RH’ Open State Cavity Barriers are positioned either flush or projecting in front of the thermal insulation.

Product fire performance:

Siderise RH25 ’Open State’ horizontal cavity barrier for maximum 25 mm air gap.

• Siderise have tested horizontal cavity barriers with a 25 mm air gap to the ASFP TGD19 method.
• During the fire tests, the seals achieved full effective closure in under 5 minutes.
• Seal temperatures remained below a 180°C rise during this activation period and maintained the EI requirements for up to E 120 and I 90.
• See manufacturers Technical Data Sheet for details. 

Siderise RH50 ’Open State’ horizontal cavity barrier for maximum 50 mm air gaps:

• Siderise have tested horizontal cavity barriers with a 50 mm air gap to the ASFP TGD19 method.
• During the fire tests, the seals achieved full effective closure in under 5 minutes.
• Seal temperatures remained below a 180°C rise during this activation period and maintained the EI requirements as detailed in Table 1 for up to E 60 and I 60.
• See manufacturers Technical Data Sheet for details. 

System fire performance:

• Siderise cavity barrier products have been used in several large-scale system tests such as BS 8414 (1&2) and NFPA 285.
• These may be used to evaluate the performance of the Siderise cavity barriers within a complete cladding system.
• The rules for the evaluation of results from BS 8414 are subsequently defined in BS 9414.
• For information regarding performance and assembly details in system tests please see our website

Please read the below in conjunction with the manufacturer's RH Technical Data Sheet.

Brackets:

• Brackets are available in two forms: (G) denotes galvanized steel brackets and (S) denotes stainless steel brackets.
• Brackets must be installed at 400 mm centres based on a 1200 mm strip. For lengths ≤800 mm 2no brackets must be used, with spacing reduced pro-rata. Lengths <100 mm should be avoided by cutting down the adjacent barrier accordingly.
• All brackets are to be suitably fixed to the substrate with non-combustible fixings.
• All brackets to penetrate product at mid-thickness.
• Please refer to separate installation instructions and the manufacturers' technical datasheet.

Screw fixings:

• Screw fixings must be installed at 400 mm centres based on a 1200 m m strip. For lengths ≤800 mm 2no screw fixings must be used, with spacing reduced pro-rata. Lengths <100 mm should be avoided by cutting down the adjacent barrier accordingly.
• All barriers to be suitably fixed to substrate with non-combustible fixings and washers with a 15 mm (maximum) head diameter.
• All screw fixings to penetrate product at mid-thickness.
• Please refer to separate installation instructions and the manufacturers' technical datasheet.