What is the maximum perimeter gap allowed on a fire door under Australian Standards?

Under AS 1905.1, the perimeter clearance between the fire door leaf and frame must not exceed 3.0mm. Gaps measuring 3.5mm or greater breach compartmentation, resulting in an immediate failure under AS 1851.

Why do retrofitted unrated locks void a fire door compliance tag?

Modifying a fire door leaf with unrated locks or improper fastenings causes structural core damage and creates paths for fire and smoke. This voids the door's Fire Resistance Level (FRL) tag and fails AS 1851 audit requirements.

Can non-compliant fire doors be repaired instead of replaced?

Yes. AS 1851 compliance recovery corrects defects such as excessive perimeter clearances, uncalibrated closer tension, misaligned latches, and missing smoke seals without the expense of full door leaf replacement.

Why do insurers check AS 1851 maintenance logbooks?

In the event of a fire incident, insurance loss adjusters review routine AS 1851 logbooks first. Unrectified defects or voided compliance tags can jeopardize building insurance coverage and leave property owners exposed to liability.

Fire Door Installations, Service & Repairs

The use of fire door assemblies within buildings is regulated by the Building Code of Australia which references the Australian Standard AS1905.1: 2005

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Section 1: The Standard & Legal Requirements

Section 2: Voided Tags & Insurance Liability

Section 3: Cost-Effective Compliance Recovery

AS 1851 & AS 1905.1 Fire Door Compliance: Millimeters Matter

A fire door is not just a heavy door—it is an engineered life-safety barrier designed to isolate smoke and flame. Under AS 1905.1, strict tolerances govern fire doorset installations, mandating that perimeter gaps between the door leaf and frame must not exceed 3.0mm.

A gap measurement of just 3.5mm—a half-millimeter variance—compromises the entire fire compartment. During routine AS 1851 maintenance audits, non-compliant perimeter clearances, sticking latches, or improper hardware trigger an immediate defect notice. To maintain certification and satisfy local council Annual Fire Safety Statement (AFSS) requirements, your fire doors must maintain verified tolerances across every opening.

Annual Fire Safety Audit Due? Don’t Let a 0.5mm Gap Void Your Coverage

Avoid council fines, failed audits, and insurance disputes. Our team diagnoses non-compliant gaps, failed closers, and damaged cores on-site

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The Hidden Liability: Voided Compliance Tags & Core Damage

Having an official compliance tag riveted to your door edge does not guarantee safety if the door has been modified. One of the most common causes of compliance failure is the installation of unrated aftermarket locks, deadbolts, or access control devices.

Structural Core Failure: Drilling or cutting into a fire door core without certified intumescent protection creates direct pathways for fire and toxic smoke to breach the compartment.
Voided Compliance Plates: Installing non-fire-rated hardware automatically voids the door’s Fire Resistance Level (FRL) compliance tag.
Insurance Claim Exposure: In the event of a fire incident, insurance loss adjusters inspect AS 1851 maintenance logbooks first. Unresolved compliance defects or voided tags can jeopardize building insurance claims and expose property owners and strata schemes to severe liability.

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AS 1851 Compliance Recovery: Rectification Over Replacement

A failed fire door audit does not always mean ordering expensive replacement doorsets. We provide targeted compliance recovery services to bring defective doors back into full AS 1851 compliance without unnecessary capital expense:

Perimeter Clearance Rectification: Re-hanging, hinge-packing, and frame adjustments to restore clearances to < 3.0mm.
Smoke & Intumescent Seal Installation: Certified perimeter seal retrofits to stop toxic smoke migration.
Closer & Latch Realignment: Hydraulic tension balancing and strike-plate realignment to guarantee positive self-latching from any angle.
Accredited Audit Sign-Off: Comprehensive inspections and logbook certification by accredited FPAS practitioners across Greater Sydney and the Illawarra.

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Cost-Effective fire door Compliance Recovery

Frequently Asked Questions

What makes a fire door a fire door?

Fire doors are given a fire-resistance rating, and are usually made of a combination of glass, gypsum, steel, timber and aluminium. They are designed to be kept closed, and any gaps between the wall and the door must be filled with a fire resistant sealant

What is the purpose of fire doors?

Fire doors create a passive fire safety system, protecting commercial buildings from the spread of fire by confining it to a specific area for a longer period of time.

Who can fit a fire door?

Unlike standard door sets, fire doors must be installed by qualified personnel as they made specifically for safety purposes and must meet with compliance standards. This includes qualified builders, carpenters and accredited fire door installers.

How do I know if a door is a fire door?

Certification. The most reliable way to identify a fire door is to look for its certification label. …
Gaps. When correctly installed the gaps around the tops and sides of a fire door should be less than 4mm thick. …
Intumescent Seals. …
Hinges. …
Closing Mechanism. …
Signage.

Ensure Your Building Is Safe, Certified, and Fully Insured

From single-door latch adjustments to complete commercial building retrofits, we handle all compliance recovery and logbook sign-offs

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