Siderise PC-FS firestops and PC-CB cavity barriers are designed for use in precast concrete cladding systems, where they can be applied to firestopping, horizontal perimeter interface sealing, and acoustic barrier functions. 

PC-FS and PC-CB products have been tested in both horizontal and vertical orientations in accordance with BS EN 1366-4:2006+A1:2010, “Fire resistance tests for service installations – Linear joint seals”. These tests assess the fire-resistance performance of the systems when installed between compartment floors or walls and external precast concrete cladding.

Siderise’s lamella construction used in PC-FS and PC-CB incorporates vertically oriented stone wool fibres. This construction has been developed to support movement accommodation within the stated performance parameters and expected 60-year service life of the product. The lamella features a special formulation of stone wool insulation with vertically oriented fibres, instead of a horizontal fibre structure.

The fibres are laterally compressed under controlled factory conditions to promote consistency of density across the product sections. This compression is retained by heat-applied reinforced foil facings. The pre-compressed vertical fibre structure contributes to the functional characteristics of the system. It allows the product to be supplied as a single dry-fit unit and enables compression within the void, supporting its friction-fit installation method. The design can also eliminate the requirement for a secondary wet seal where this is appropriate to the project design and specification.

Siderise PC-FS firestops and PC-CB cavity barriers are manufactured using a method that provides resilient lateral compression. This facilitates installation, ensuring the requisite tight fit and enhancing the fire integrity of the product.

Standard systems:

The materials can be either supplied as pre-cut units to suit a specified void size or in sheet form for cutting on-site. Standard sheet products are supplied 1200 x 1200 mm which may prove beneficial when the actual void size is not known or where it varies significantly. Please note that when ordered in sheet form, the requisite quantity of fixing brackets needs to be purchased separately.

Pre-cut strips are available in 1mm increments of width to suit the cavity size to provide a tight compressive fit within the void - Please see Table 1 regarding fit type. Each pre-cut unit is supplied with appropriate fixing brackets as part of the system.

The standard fixing brackets are supplied in galvanized mild steel and stainless steel in a flat form for folding on-site. Fixing brackets are provided pre-drilled, enabling uncomplicated installation in accordance with project requirements. Different size brackets are available according to the cavity size – please manufacturers technical datasheet.

All fixing brackets are to be mechanically secured to the substructure with suitable non-combustible fixings.

Features and benefits:

• Fire resistance: PC-FS60 and PC-FS120 firestops are certified to deliver 1 hour and 2 hours fire resistance, respectively. PC-CB30 cavity barrier is certified to deliver up to 30 minutes fire resistance. See the product technical data sheet for full details.
• Supplementary fire test data: The PC-FS and PC-CB range benefits from supplementary test evidence to aid the design team and project fire engineer in their holistic review and provide additional support for a wider range of project conditions. Supplementary data includes: 

1. Firestop interfacing with a concrete cladding hanger (BS EN 1366-4: 2006+A1: 2010). 
2. Firestop to the end of flexible wall construction (BS EN 1366-4: 2021). 
3. Firestop with Siderise bracket securement to underside of slab edge to assist installation methodology (BS EN 1366-4: 2006+A1:2010). 

• Installation flexibility: PC-FS Firestop and PC-CB Cavity Barrier can be fit from above or below the slab — making them ideal for where topside access is limited, or sequencing requires alternative installation approaches, whilst a bracket-free installation in narrow cavities offers a practical advantage for 20-50mm cavities where access is also limited. 
• 60-year design life: To confirm in-application durability and robustness in their ability to maintain their form and performance when exposed to specific use conditions, PC-FS Firestop and PC-CB Cavity Barrier have been subjected to EOTA Technical Report 024 ‘Type X’ accelerated age testing - the harshest category, which replicates exposure to rain, UV, high temperatures, and frost and thaw cycles.