Fire Engineering & Building Compliance

The Vital Role of Passive Fire Protection (PFP) in Commercial & Industrial Structures

Passive Fire Protection (PFP) is an integral component of structural fire protection and life safety in commercial buildings, data centres, industrial plants, and structural steel facilities. Unlike active systems that require automatic or manual triggering, PFP is built directly into the structure to contain fires at their point of origin, slow the spread of flame and toxic smoke, and prevent premature structural collapse.

In South Africa, PFP is not optional. The National Building Regulations and SANS 10400 (particularly SANS 10400-T: Fire Protection) require fire-rated separation, protected egress and tested penetration sealing across most commercial and industrial occupancies. Yet PFP is often the least visible and most frequently compromised part of a building's fire strategy — a gap that insurers, fire engineers and regulators are increasingly scrutinising. For facility types where this matters most, see our companion article on safeguarding high-voltage substations.

Active vs Passive Fire Protection: Why You Need Both

Active systems (sprinklers, deluge, gas suppression, detection, smoke extraction) are essential — but they only function if power, detection and maintenance are intact. PFP is designed to work whether or not anyone is present, whether power is available, and regardless of whether the active system has already been overwhelmed. The two are complementary:

• Active systems detect and suppress a fire — they shorten the event.
• Passive systems contain the fire and preserve structural integrity — they buy the time needed for suppression, evacuation and emergency response.

A building with only active protection has no reliable barrier once the suppression system is exhausted, isolated or failed. PFP is the safety net that allows people to evacuate and the fire service to operate safely.

Understanding Fire-Resistance Ratings

A Fire-Resistance Rating refers to the specific period of time a building element, component, or assembly maintains the ability to confine a fire, continues to perform its structural function, or both — as determined by independent third-party tests and established testing standards.

Common endothermic building materials include calcium silicate board, concrete, and Type X gypsum wallboard, complemented by intumescent and ablative materials. However, materials bear no fire rating on their own. They must be organised and installed as complete, tested systems by an accredited service provider such as Lionize Group.

What Do R, E, and I Mean?

Fire-resistance ratings are typically expressed as a period (e.g. 60, 90, 120 minutes) followed by letters that describe what the element is being tested for:

• R — Load-bearing capacity: the element continues to carry its design load without collapsing. Applies to walls, floors, beams and columns.
• E — Integrity: the element prevents the passage of flame and hot gases. Applies to walls, doors, partitions and screens.
• I — Insulation: the element limits the temperature rise on the unexposed face. Applies to walls and doors protecting adjacent compartments and egress routes.

A fire door rated REI 120, for example, has been tested to maintain load-bearing capacity, integrity and insulation for 120 minutes. Specifying the correct rating for the correct compartment is a core part of any compliant PFP design.

Core PFP Assemblies We Supply & Install

• Fire-Resistance Rated Wall Assemblies:
  • Fire Walls: Continuous from foundation to or through the roof and exterior walls, providing complete building separation and structural stability.
  • Fire Barriers: Continuous floor-to-floor assemblies protecting vertical shafts and occupancy separations.
  • Fire Partitions & Protected Corridors: Dwelling unit separations and safe egress corridors terminating at fire-rated floor/ceiling assemblies, including monolithic and laminated fire-rated glass doors and screens.
• Structural Steel Fireproofing: Intumescent coatings, board protection systems, and concrete-filled hollow sections that prevent steel from losing load-bearing capacity under extreme fire temperatures.
• Penetration Seals & Expansion Joints: Tested sealing systems for pipes, cable trays, and HVAC ducts, alongside flexible glass-fabric fire curtains for large cavities and fire-stopping mattresses/blankets for expansion joints.
• Fire Doors & Fire-Rated Glazing: Certified door sets and screens, complete with ironmongery, seals and smoke gaskets, correctly installed and documented.

Structural Steel Fireproofing in Detail

Steel is non-combustible but not heat-resistant. Above approximately 550 °C it begins to lose strength rapidly; at the temperatures reached in a fully developed compartment fire, unprotected steel can fail within 10–15 minutes. In commercial and industrial buildings where steel frames support roofs, floors or mezzanines, this is a critical risk.

Lionize designs and installs thin-film intumescent coatings, board systems and concrete-encased solutions, specified to the required rating (typically 60–120 minutes) and tested to recognised standards. Coatings are selected for internal/external exposure, topcoat requirements and compatibility with the existing steel surface treatment.

Common PFP Failure Points (And How to Avoid Them)

In our experience across South African commercial and industrial sites, PFP failures cluster around a handful of predictable issues:

• Unsealed or partially sealed penetrations: the single most common failure. New cable pulls, plumbing changes or maintenance work frequently leave seals compromised.
• Incorrect product selection: using a seal or coating outside its tested configuration (wrong wall type, oversized service, wrong orientation).
• Undocumented installation: systems that cannot be verified against a test report or certificate are, for insurance and compliance purposes, treated as untested.
• Fire doors propped open or altered: missing gaskets, removed closers, or doors planed to fit — all of which defeat the rating.
• Missing as-built records: without a certificate and drawings, the rating cannot be demonstrated to a fire engineer, insurer or regulator.

Each of these is avoidable through design review, installation by an accredited contractor, and a documented Certificate of Conformance.

Inspection, Maintenance & Lifecycle Management

PFP is a long-life asset that needs periodic verification. We recommend annual inspections — and post-project inspections after any construction, refurbishment or services installation — covering:

• Penetration seals: completeness, damage, subsequent services installed through the seal.
• Fire doors and screens: operation, gaps, seals, signage and documentation.
• Intumescent coatings: thickness, cohesion, damage and compatibility with surface finishes.
• Fire walls and barriers: any unapproved openings or alterations.

Where deficiencies are found, remediation must restore the system to its original tested detail. Partial fixes or substitutions often void the rating of the entire compartment.

The South African Regulatory Framework

The key standards relevant to PFP in South Africa include:

• SANS 10400-T: Fire protection — the deemed-to-satisfy rules for building fire safety, including fire resistance, compartmentation and egress.
• SANS 10177: Fire testing and classification of building materials and systems.
• National Building Regulations (NBR): legal framework within which SANS 10400 operates.
• Municipal by-laws and fire department requirements: additional local requirements, particularly for industrial and high-risk occupancies.

Compliance is demonstrated through design documentation, tested system specifications, and installation certificates. For larger or higher-risk facilities, we strongly recommend involving a registered fire engineer at the design stage — the earlier PFP is integrated, the more cost-effective and reliable it is.

Frequently Asked Questions

Continue Reading

• Safeguard Your High Voltage Substations — how cable coatings, transformer barriers and penetration seals protect electrical infrastructure.
• Lionize Group Fire Protection services — product range and installation capability.
• Compliance and Check — audits, documentation and Certificates of Conformance.