Siderise CW-FS120 used in 73-storey New York development

Siderise has reported that its CW-FS120 Firestop system has been installed at 989 6th Avenue, a newly built 73-storey tower in Manhattan.

According to Siderise, the CW-FS120 system provides passive fire protection for the tower’s unitised curtain wall façade.

The manufacturer said the firestop was selected to deliver floor-to-floor compartmentation at the junction between floor slabs and the internal surface of the external wall.

Siderise stated that the installation was carried out by Marvel Contracting, who coordinated with US distribution partner Facades X.

The CW-FS120 product was tested to ASTM E2307 and has an FT rating of up to three hours, the company added.

Firestop tailored to complex slab-edge geometry

The building is located between Bryant Park and the Empire State Building in the Garment District.

It was designed by C3D Architecture and features a concrete frame with a glass curtain wall, open terraces and a multi-cylinder podium.

Siderise said the CW-FS120 firestop was selected for its ability to support continuous perimeter fire protection across a non-standard slab-edge design.

The company said the east elevation required custom detailing to address curved sections and staggered floor plates.

Façade contractor Bisam Façade and consultants at Socotec collaborated with Siderise to prepare the technical submittal for the firestop system.

Siderise explained that this included full documentation of installation methods to maintain compression fit and accommodate expected movement during the building’s lifespan.

Firestop tested to US building standards

Siderise reported that the CW-FS120 Firestop system has been tested for L-rating compliance with the International Building Code.

The system’s FT rating was validated through testing to ASTM E2307 as part of the CW Perimeter Barrier System.

Siderise said the core of the product is made from vertical-fibre stone wool Lamella.

This material was selected for its ability to accommodate movement within high-rise structures and retain its firestop properties over time.

The manufacturer stated that the design life of the CW-FS120 system is 60 years.

Installation supported by Siderise site services

According to Siderise, Marvel Contracting received project-specific training before installation began.

Training and oversight were provided by Siderise Site Services.

The company said this included benchmark installations and regular inspections.

Siderise explained that the Siderise Inspection App was used to document performance and compliance across the installation.

Support was maintained throughout the project to ensure the system was installed in accordance with manufacturer recommendations.

Partnership with Marvel Contracting and Facades X

Marvel Contracting carried out the firestop installation as part of its role on the curtain wall system.

According to Siderise, Marvel worked with Facades X to specify and procure the CW-FS120 product.

The product was fabricated by Bisam Façade and incorporated into the unitised curtain wall system.

Siderise said coordination with these partners ensured that installation could proceed efficiently despite the challenges of the curved and staggered façade.

The company said the project required a firestop solution that combined high performance, certified testing, and adaptability to the tower’s structural design.

Passive fire protection from Siderise used in Manhattan high-rise: Summary

Siderise has installed its CW-FS120 Firestop system at 989 6th Avenue in Manhattan.

The system provides passive fire protection between floors and curtain wall sections.

Marvel Contracting carried out the installation.

Facades X supplied the firestop system.

The system was tested to ASTM E2307 and has an FT rating of up to three hours.

It is also compliant with the L-rating in the International Building Code.

Siderise said the product uses a stone wool Lamella core.

The system was tailored for curved slab edges and non-standard geometry.

Bisam Façade and Socotec supported technical preparation.

Siderise Site Services provided onsite training and inspections.