Curtain Wall and Edge of Slab

Fire barrier systems for single spandrel, zero spandrel, and steel back pan configurations

Hilti’s vast library of firestop solutions ranging from traditional spandrel designs, 100% vision glass or EIFS are unrivaled in the industry.

firestop for curtain wall and edge of slab

That narrow gap between your floor slab and façade is bigger than it looks! Take a 100 x 100 ft. building with the usual 3” void: that’s a tiny footprint, but it adds up to 100 ft2 of open space for gas, smoke and flames to rise from floor to floor. Almost all international building codes now recognize how critical perimeter fire barriers are to the overall building safety plan.

Ambitious designs and strict schedules mean that perimeter fire containment must be quick and easy to install correctly. Acoustic, thermal and movement requirements can’t be ignored either. 

With these industry trends in mind, we have developed inventive fire compartmentation solutions that not only help protect lives, but can also help solve other engineering, specification and installation challenges as well. Pre-formed firestop barriers and versatile spray sealants are at the forefront of this new generation.

Solutions for Edge-of-slab and Curtain wall


First Pre-formed Solution for Edge of Slab and Curtain wall Firestopping

contractor installing CFS-EOS Quick Seal at the edge of a building façade

CFS-EOS QuickSeal is a preformed solution that is easy to install, without the need for mineral wool and spray sealants. That means it can be installed in a wide range of temperature and weather conditions without affecting its performance and there is no equipment to haul around or mess to clean up. 

CFS EOS QS does not rely on mineral wool compression, so it's fast and easy to inspect and as a preformed device may not be subject to the same destructive testing as may be required for other third-party inspections.

The product can be used on joint size ranges from 1.5 inches to 5 inches, with an optional sealant if water tightness is required.

Learn more about CFS-EOS QuickSeal

The Ultimate Fast Cure Sealant

CFS-SIL firestop silicone sealant is a fast-curing and highly elastic firestop sealant for curtain wall or edge-of-slab applications. This silicone-based spray is water-resistant, so – at least when it comes to firestop – your productivity is not weather-dependent.

The movement capabilities of CFS-SIL meet leading industry standards, and its water-resistance helps to reduce moisture damage to the joint. After curing, the sealant can easily be painted.

Learn more about CFS-SIL firestop silicone sealant

The Traditional Spray Sealant

Our traditional, water-based sealant – CFS-SP WB – is a versatile spray for curtain wall or edge-of-slab applications where exposure to water and the elements is not anticipated during the lifecycle of the building.

As with other Hilti spray sealants, CFS-SP WB has high-performance movement capabilities that meet leading industry test standards and can easily be painted.

Learn more about CFS-SP WB firestop sealant spray

full vision glass firestopping system

Full Vision Glass

Hilti is the first and only manufacturer to have a tested perimeter fire barrier system for full vision glass. The system (HI/BPF 120-11) provides an aesthetically pleasing fire-rated assembly for floor-to-ceiling glass designs with Class IV movement capabilities in a fully unitized assembly.

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firestopping for steel back pan

Steel Back Pan

Used commonly on unitized and stick built curtain wall systems, the back pan or shadow box system offers architects, fabricators and façade installers numerous benefits.

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Specification Resources