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Curtain Wall

STI is the global leader in developing perimeter fire barrier systems for sealing the void area between a fire-rated floor and non-rated exterior wall.

Curtain Wall

Testing Standards

Perimeter fire barrier systems are tested according to ASTM E2307, "Standard Test Method for Determining Fire Resistance of Perimeter Fire Barriers Using Intermediate-Scale, Multi-Story Test Apparatus (ISMA)".

The ISMA structure is a two-story furnace that subjects a perimeter fire barrier system to fire exposure from two sides simultaneously

STI offers the benefit of UL Certification

With more than 100 years of experience testing for fire resistance, UL offers easy code acceptance by AHJs, building owners, and architects.

No one has more UL Certified Systems.

With 106 individually tested and UL Certified solutions for a multitude of façade types, we are the leader in offering UL Certified solutions and have more testing than all other listed manufacturers combined at UL.

Comprehensive testing packages

  • Aluminum framed walls with glass, aluminum, or stone spandrels
  • Precast concrete panels
  • Steel-framed walls with gypsum sheathing, including finishes such as EIFS, stucco, brick, or metal siding
  • Glass-fiber reinforced concrete (GFRC) panels
  • Galvanized steel back pan curtain walls

A new simple solution for floor-to-ceiling vision glass

STI/BPF 120-03 is our latest perimeter fire barrier engineered system, is easier to install, ensures 2-hour T-rated fire protection, and allows for full vision glass. This design was tested according to ASTM E2307.

Spray-applied firestop coatings

STI manufactures two grades of elastomeric firestop coatings:

  • SpecSeal® Safing Spray is a latex-based firestop spray specifically formulated for perimeter fire barrier application
  • SpecSeal® Series FT Fast Tack Firestop Spray, a hybrid polymer coating designed for use in inclement weather

Quick Clip™ Insulation Hangers

The Quick Clip™ Perimeter Fire Barrier System is designed to accelerate the installation of curtain wall spandrel insulation. The system's unique U-brackets clip onto mullions without screws to support the curtain wall insulation. Self-locking fasteners secure the insulation panels in place.

Quick Clip™ Insulation Hangers

Curtain wall connection protection system

We worked with UL® to devise a method to evaluate curtain wall connection protection. We conducted fire tests to evaluate and compare the connection protection concept to traditional fire protection materials. This included spray-applied fire-resistive materials (SFRM), which resulted in the establishment of the XHDI category for “Accessories for Perimeter Fire Systems,” and the publication of specific systems within the XHDG category.