AS 4072.1 applies to all firestopping systems for service penetrations and control joints, regardless of the substrate. However, the requirements — and the tested solutions — differ significantly between plasterboard and concrete walls. Understanding these differences is essential for avoiding non-compliance and costly rectification work.
Structural and Fire Performance Differences
Concrete walls are naturally dense, non-combustible, and capable of maintaining fire resistance with minimal support. Plasterboard walls, by contrast, rely on the construction of the boards and framing system to achieve their FRL, which means penetrations require more careful detailing.
- In concrete, the key issue is ensuring proper adhesion and mechanical anchorage of the firestop system.
- In plasterboard, the cavity behind the boards must be considered, and fire-rated backing materials are often needed to support sealants or collars.
Variations in Tested Systems
Manufacturers conduct separate AS 1530.4 tests for concrete and plasterboard substrates. A fire collar tested and approved for a 150 mm concrete wall may not be approved for a 64 mm steel-stud plasterboard wall. Likewise, wraps and sealants often require different installation depths, backing materials, and annular gap tolerances depending on the wall type.
Ceasefire PFP verifies every installation against the appropriate test report, including:
- Wall type and thickness
- Penetration size and shape
- Orientation (wall or floor)
- Required backing materials
Installation Considerations
In concrete, anchors must be drilled to specific depths and diameters to secure collars or boards. In plasterboard, the fixing must engage with studs or noggins, or additional fire-rated supports must be installed.
Sealant application also differs:
- Concrete may allow direct bonding of sealant to the substrate.
- Plasterboard often requires a mineral wool or fire-rated foam backing to support the sealant and maintain FRL.
Common Mistakes
- Using concrete-tested systems in plasterboard walls without verifying approval
- Omitting backing materials in plasterboard penetrations
- Over-cutting openings and creating excessive annular gaps
- Using non-rated fillers or patching compounds in repairs
Ceasefire’s Approach
Our technicians assess the substrate first, then select systems that match the exact tested configuration. We carry multiple variants of collars, wraps and sealants to ensure the appropriate match for each wall type. Every installation is photographed and recorded in our Passive Fire Register, with the substrate clearly documented for traceability.
In summary, while AS 4072.1 applies equally to plasterboard and concrete, the solutions are not interchangeable. Correct system selection, meticulous installation, and thorough documentation are essential for compliance. With Ceasefire PFP, every penetration is sealed to the correct standard — regardless of wall type.
