NCC 2022 Volume One - Building Code of Australia Class 2 to 9 buildings
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1

Specification 1 Fire-resistance of building elements

Specification 1 Fire-resistance of building elements

Deemed-to-Satisfy Provisions often require building elements to have an FRL. Specification 1 explains how these FRLs are to be determined and, in conjunction with Tables S1C2a to S1C2n, outline how FRLs apply to specific building elements and materials.
2019: Sch. 5: 1
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To clarify that Specification 31 includes the requirements for fire and smoke control systems in buildings with an atrium.

Specification 31 includes the requirements for fire and smoke control systems in buildings containing an atrium. 
Where a sprinkler system is required, it must be installed in the whole building, not just that part in which the atrium is located.

2019: Sch. 5: 2
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To set out the installation requirements and delineate compliance pathways for a building element to meet this Specification.

An FRL is expressed in terms of figures that cover structural adequacy, integrity and insulation.

Examples

A loadbearing wall may require an FRL of 120/60/30 – meaning that in the Standard Fire Test, the wall must retain its:

  • Structural adequacy for at least 120 minutes;
  • Integrity for at least 60 minutes; and
  • Insulation properties for at least 30 minutes.

A non-loadbearing wall, however, may require an FRL of -/120/120 – meaning that in a Standard Fire Test, the wall is not required to retain any structural adequacy criterion. However, in a Standard Fire Test, the wall must maintain its:

  • Integrity for at least 120 minutes; and
  • Insulation properties for at least 120 minutes.

Some building elements have been tested and their FRLs have been determined. A number of these are included in Tables S1C2a to S1C2n. To achieve the FRLs contained in tables S1C2a, S1C2b, S1C2c, S1C2e, S1C2f, S1C2g, S1C2h, S1C2i, S1C2j, S1C2l, and S1C2m each element must comply with Specification 2.

Research results are generally available from the manufacturers who sponsor the tests. 

A number of Standards Australia structural codes have provisions for the calculation of FRLs. Some more complicated building elements have many combinations and permutations, and reference to specific Australians Standards is necessary.

2019: Sch. 5: 3
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To establish methods for determining a building element's FRL by calculation using data from a similar tested prototype.

S1C3(a) contains permitted variations for when a building element’s FRL is determined by calculation based on a tested prototype that is similar. Required considerations for calculations are included in S1C3(c).

2019: Sch. 5: 4
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To provide further options for building element selection by providing interchangeable materials.

2019: Sch. 5: 5
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To clarify that lightweight construction used to protect steel columns must adhere to C2D9 and C4D17.

2019: Sch. 5: 6
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To specify that a non-loadbearing element need not meet any structural adequacy requirement.