Improving the fire safety of facades

The importance of properly firestopping the largest joint in a building


That narrow gap between your floor slab and façade is bigger than it looks! Take a 30m x 30 m. building with the usual 75mm void: that’s a tiny footprint, but it adds up to 9 m2 of open space for gas, smoke and flames to rise from floor to floor. After numerous fires – which have taken hold via these voids between the fire-rated floor and non-fire rated curtain wall – 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 protect lives, but can 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.


CFS-SP 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-SP 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.

Related products

  • Hilti firestop joint spray CFS-SP SIL

    Fire-rated joint spray seals construction joints

    Where maximum movement is required

    Show me more

Fire protection

All you need to know about controlling damage during a fire