Fire collars are vital components in any passive fire protection strategy, particularly where combustible pipes pass through fire-rated walls or floors. Selecting the correct collar requires a clear understanding of the pipe material, the characteristics of the wall or slab, the required Fire Resistance Level (FRL), and the correct installation method. Choosing the wrong product can lead to inspection failures, NCC non-compliance, and—in the worst case—failure during a fire event.
At its core, a fire collar is an intumescent device that expands in the presence of heat, compressing and sealing plastic pipes to stop the passage of flames and smoke. However, not all fire collars are the same. Using an off-the-shelf collar without reference to test data is a common and serious compliance issue.
Pipe Type Considerations
- PVC Pipes – The most common in residential and light commercial plumbing. They soften and collapse quickly in fire. Standard collars (typically rated for 50–100 mm) work effectively when matched to the correct substrate.
- HDPE Pipes – Burn hotter and slower, requiring collars with higher expansion capacity. Only collars tested specifically for HDPE in the correct wall or floor configuration should be used.
- Polypropylene / Composite Pipes – Often used in mechanical systems. Due to their unique burning characteristics, these pipes may require wrap systems in addition to collars.
Substrate Matters
Fire collars tested in concrete may not be suitable for plasterboard or AAC. Each system must be tested and approved for:
- The thickness of the wall or slab
- The orientation (wall vs floor)
- The installation method (cast-in vs surface-mounted)
Ceasefire PFP verifies every collar selection against test reports and manufacturer data sheets. All products are logged in our Passive Fire Register, including penetration ID, product type, installation date and photographic evidence.
Mixed Service Penetrations
Penetrations often contain multiple services—for example, a PVC pipe alongside a copper pipe or cable tray. In these instances, a certified composite system is required (e.g. fire-rated boards or mortar combined with collars). A single collar is not sufficient. Ceasefire uses certified systems from trusted manufacturers including BOSS, Trafalgar and Promat to address these complex configurations.
Common Mistakes to Avoid
- Selecting collars not matched to the service or substrate
- Incorrect fastener type or spacing
- Installing the collar on the wrong side of the wall
- Omitting backing rod or sealant when required
- No inspection or documentation
Ceasefire’s Approach
We carry out detailed pre-installation checks, provide marked-up drawings, and supply photographic verification upon completion. All collars are installed strictly in accordance with their test certification, with full traceability maintained throughout.
Selecting the correct fire collar is about more than just ticking a box—it’s about protecting lives, avoiding liability and ensuring smooth project approval. Engage Ceasefire PFP early and get it right the first time.
