Firestop for large openings

All you need to know to master the smoke- and fire-sealing of large openings


Take a walk through the plant room of any modern building and you’ll see a maze of layered M&E services which would have been unimaginable a few years ago. This endless array of cables, bundles, trays, conduits, plastic and metal pipes need larger wall and floor penetrations than ever – which presents new challenges for fire compartmentation. You can rely on Hilti Firestop to deliver workable smoke- and fire-resistant sealants around these larger penetrations.

It’s not just the scale of technical installations that has grown, but also the rate of change. Any high-spec project – but especially data centers and hospitals – depends on building services that allow rapid, downtime-free changes. By choosing re-penetrable firestop solutions, you can maintain your ever-changing M&E installations without sacrificing efficiency or safety.

To deliver the adaptability you need in larger openings, we offer preformed solutions like fire blocks. It is designed to be easy to specify, install and inspect.


Firestop block CFS-BL

If you expect to upgrade or expand your M&E installations very frequently, preformed solutions – like firestop blocks – are ideal for easily sealing large openings. This non-curing and re-usable solution is designed for high-productivity installation by a single person with no special tools. CFS-BL firestop blocks have been designed specifically to simplify re-penetration of retrofitted cables. They can be dismounted, cut and re-installed easily. Firestop blocks also minimize airborne dust and fibers when compared to more traditional solutions like firestop coated boards and mortars.

Our preformed, surface-mounted solution – the CFS-BL firestop block – has been designed for firestopping mixed openings. Its modular design means that you can combine up to three elements together for the firestopping of opening sizes up to 1000mm x 1000mm. This easy-to-install and inspect, virtually dust-free solution allows for a 60% cable fill on regular and irregular openings. It also allows you to seal old, damaged or incorrectly sealed penetrations – even without removing the existing firestop material in the opening.


Related products

  • Hilti firestop block CFS-BL

    Firestop blocks

    Preformed reusable soft blocks, easy to install and dismantle

    Show me more

Fire protection

All you need to know about controlling damage during a fire