Why Contractors Are Switching to Hilti Firestop Systems
Firestop is one of those categories where the cheapest solution can become the most expensive mistake. A failed firestop inspection on a commercial project doesn't just mean buying more caulk — it means rework, re-inspection fees, schedule delays, and a very unhappy GC-sub relationship.
We've watched a growing number of our commercial accounts shift to Hilti firestop systems over the past two years, and the reason is consistent: they pass inspection the first time.
The System Approach
What distinguishes Hilti isn't any single product — it's the system. Hilti engineers tested assemblies for specific combinations of pipe material, annular space, wall construction type, and fire rating. Those tested assemblies are documented in UL-listed system designs that inspectors can look up directly.
When a contractor installs a Hilti firestop assembly and documents it using Hilti's system design number, the inspector isn't evaluating a product — they're verifying a tested, listed assembly. That's a fundamentally lower-risk outcome for everyone.
Key Products in the System
- CP 606 Flexible Firestop Sealant — The workhorse for most penetration sealing applications. Paintable, flexible, and rated for 2, 3, and 4-hour assemblies.
- CP 678T Fire Retardant Intumescent Pipe Wrap — For plastic pipe penetrations where sleeving isn't practical
- FS-ONE MAX Intumescent Firestop Sealant — Upgraded formulation for deep-joint and difficult-access applications
- CFS-S ACR Acrylic Sealant — For non-combustible penetrations where a smoke seal is sufficient
Documentation That Protects You
Hilti's online system selector generates a printable, job-specific documentation package that specifies the exact product, installation method, and applicable UL design number for each penetration type on your project.
Keep these on file. When an inspector asks how a penetration is protected, you can hand them documentation rather than a spec sheet.
In Stock Now
We carry the full Hilti CP and FS-ONE firestop line. Volume pricing available for commercial accounts. Contact your account manager for project-specific ordering assistance.