Siderise RH Open State Cavity Barriers for Ventilated Cladding / Rainscreen - Horizontal

Siderise RH ‘Open State’ horizontal cavity barriers (OSCB) consist of a non-combustible stonewool lamella insulation core, with reinforced aluminium foil faces. This primary seal has a reaction to fire performance to Class 'A1'. The exposed leading edge is also sealed with aluminium foil. Whilst the base material is water repellent and non-hygroscopic, this predominantly enclosed arrangement affords an added degree of weather protection to the core material.

Siderise RH ‘Open State’ horizontal cavity barriers incorporate a continuous high performance reactive intumescent strip which is bonded to the leading edge. The intumescent material has a reaction to fire performance to Class 'E'. In the event of exposure to fire, the intumescent rapidly expands and fully seals the purposely designed ventilation gap formed at the time of installation, between the barrier and the rear of the cladding.

As standard, the range includes a choice of products to suit either 25 mm air gaps - referred to as RH25 - or 50 mm air gaps - referred to as RH50. Both options are available with either galvanized mild steel (G) or stainless steel (S) fixing brackets as part of the system. Both are 'Open State' products.

The specific horizontal cavity barrier system is then referred to as either RH25G, RH25S, RH50G or RH50S accordingly. The choice of brackets is usually determined by the rainscreen system designer according to project exposure and/ or location.

The leading edge of the horizontal 'Open State' cavity barriers is encapsulated in a weather-resistant polymer film. As standard, the film is black to register as a ‘shadow-line’ behind open joints in the cladding.

For product identification purposes, the top edges of the film used on the RH25 and RH50 cavity barriers are colour-coded and labelled to show the product fire performance rating.

Features and benefits:

• RH 'Open State' are IFC Certified (IFCC 1712)
• RH 'Open State' Allow continuous ventilation and drainage behind the rainscreen envelope
• Tested to ASFP TGD19 ‘Fire Resistance Test of Open State Cavity Barriers’ utilizing BS EN 1363-1 and Principles of BS EN 1366-4
• Provides up to 120 minutes' fire integrity and 90 minutes insulation- (RH25-120/90).
• Suitable for horizontal (open void) applications
• All RH Open State horizontal cavity barriers are colour-coded for ease of identification.

SIDERISE RH Open State Horizontal Cavity Barriers:

Consists of a non-combustible stonewool lamella core, with reinforced aluminium foil faces, giving an overall reaction to fire performance to Class A1. The exposed leading edge is also sealed with aluminium foil. Whilst the base material is water repellent and non-hydroscopic, this predominantly enclosed arrangement affords an added degree of weather protection to the core material.

SIDERISE RH ‘Open State’ horizontal cavity barriers incorporate a continuous high-performance reactive intumescent strip which is bonded to the leading edge. The intumescent material has a reaction to fire performance to Class 'E'. In the event of exposure to fire, the intumescent rapidly expands and fully seals the purposely designed ventilation gap, formed at the time of installation, between the barrier and the rear of the cladding.

As standard, the RH Open State range includes a choice of products to suit either 25 mm air gaps - referred to as RH25 - or 50 mm air gaps - referred to as RH50. Both options are available with either galvanized mild steel (G) or stainless steel (S) fixing brackets as part of the system.

Brackets

• Brackets are available in two forms: (G) denotes galvanised 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 the product at mid-thickness.
• Please refer to separate installation instructions and the manufacturer's technical datasheet.

Screw fixings:

• Screw fixings are required for barrier dimensions for smaller voids i.e. RH25 (voids up to 75 mm) and RH50 (voids up to 100 mm).
• Screw fixings must be installed at 400 mm centres based on a 1200 mm 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 the substrate with non-combustible fixings and washers with a 15 mm (maximum) head diameter.
• All screw fixings to penetrate the product at mid-thickness.
• Please refer to separate installation instructions and the manufacturers' technical datasheet.