SIDERISE RH | 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 25mm air gaps - referred to as RH25 - or 50mm air gaps - referred to as RH50. Both options are available with either galvanised mild steel (G) or stainless steel (S) fixing brackets as part of the system.
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 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:
IFC Certified (IFCC 1712)
Allow continuous ventilation and drainage behind the rainscreen envelope
Tested to ASFP TGD19 ‘Fire Resistance Test of Open State Cavity Barriers’ utilising 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 horizontal cavity barriers are colour-coded for ease of identification