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CURTAIN WALL Thermafiber® Impasse® Zero Spandrel Perimeter Fire Containment System Thermafiber® Aluminum-Framed Curtain Wall Perimeter Fire Containment System Zero Spandrel


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The Thermafiber® Impasse® Zero Spandrel Perimeter Fire Containment System is a perimeter fire containment system that will serve any short spandrel design with an F-rating of up to 3-hours.

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Performance Attributes

Key Attributes:

Easy Installation
Fire Containment

ASTM E2307

ASTM E2307 measures the ability of perimeter fire barrier systems to maintain a seal and prevent interior fire spread as the exterior wall assembly deflects and deforms during fire exposure. The ASTM E2307 test exposes the joint to fire from the room of fire origin and the exterior wall to fire from both the interior and the exterior as the fire plume exits the room of fire origin through a window opening. ASTM E 2307 determines the period of time that the perimeter fire containment system will limit flame penetration through the opening between the exterior wall assembly and the floor assembly.

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INTERTEK® Approved Design per ASTM E2307

Intertek is a leading provider of testing, inspection, and certification services worldwide. They offer a wide range of services, including testing for fire safety compliance. Intertek helps ensure that products and systems comply with relevant industry standards and regulations, including ASTM E2307. This test is critical in determining the fire safety of exterior wall assemblies and preventing the spread of flames. Design documents: 2-Hour F Rating Listing: TFI/BPF 120-15 | 3-Hour F Rating Listing: TFI/BPF 180-07


International Building Code, Section 715.4 Compliant

The 2021 International Building Code (IBC), Section 715.4, voids created at the instersection of exterior curtain wall assemblies and fire-resistance-rated floor or floor/ceiling assemblies shall be protected with an approved perimeter fire containment system to prevent the interior spread of fire. Such systems shall provide an F rating for a period of time period not less than the fire-resistance ratingn of the floor or floor/ceiling assembly.

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Construction Details including CAD drawing files for the Thermafiber® Aluminum-Framed Curtain Wall Perimeter Fire Containment System Zero Spandrel are available for download below.

CAD Files

Thermafiber® Zero Spandrel System CAD- Detail


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