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fire resistance level (FRL)

Also called: FRL, fire-resistance rating (NZ)
Standards
the nominal grading period, in minutes, that is determined by subjecting a specimen to the standard time temperature curve regime as set out in AS 1530.4 , to specify—
  1. (a) structural adequacy;
  2. (b) integrity; and
  3. (c) insulation,
which are expressed in that order.
For example, a building element with an FRL of 120/60/30 will maintain, when tested in accordance with AS 1530.4 —
  1. (a) structural adequacy for a period of 120 min;
  2. (b) integrity for a period of 60 min; and
  3. (c) insulation for a period of 30 min.
AS 1530.4 generally only requires service penetrations and control joints to be assessed against the criteria of integrity and insulation and the FRL is expressed in terms of, (−/YY/ZZ).
Source - AS 4072.1-2005: Components for the protection of openings in fire-resistant separating elements
Standards
the grading periods, in minutes, determined in accordance with AS 1530.4 , for—
  1. (a) structural adequacy;
  2. (b) integrity; and
  3. (c) insulation,
expressed in that order
Source - AS 4254.2-2012: Ductwork for air-handling systems in buildings
Standards
the nominal grading period, in minutes, that is determined by subjecting a specimen to the standard time temperature curve regime as set out in AS 1530.4 , to specify—
  1. (a) structural adequacy,
  2. (b) integrity, and
  3. (c) insulation,
which are expressed in that order
For example, a building element with an FRL of 120/60/30 will maintain, when tested in accordance with AS 1530.4 —
  1. (a) structural adequacy for a period of 120 min;
  2. (b) integrity for a period of 60 min; and
  3. (c) insulation for a period of 30 min.
Source - AS 3959:2018: Construction of buildings in bushfire-prone areas
Standards
the fire resistance period for structural adequacy only, in minutes, which is required to be attained in the standard fire test
Source - AS/NZS 4600:2018: Cold-formed steel structures
Standards
the nominal grading period, in minutes, that is determined by subjecting a specimen to the standard time temperature curve regime as set out in AS 1530.4 , to specify—
  1. (a) structural adequacy;
  2. (b) integrity; and
  3. (c) insulation,
which are expressed in that order
For example, a building element with an FRL of 120/60/30 will maintain, when tested in accordance with AS 1530.4 —
  1. (a) structural adequacy for a period of 120 min;
  2. (b) integrity for a period of 60 min; and
  3. (c) insulation for a period of 30 min.
the structural adequacy criterion is not applied to fire-resistant roller shutters and the FRL is expressed in terms of (–/YY/ZZ).
Source - AS 1905.2-2005: Components for the protection of openings in fire-resistant walls
Standards
the grading periods, in minutes, determined in accordance with Specification A2.3 of the Building Code of Australia, for—
  1. (a) structural adequacy;
  2. (b) integrity; and
  3. (c) insulation;
and expressed in that order
A dash means that there is no requirement for that criterion. For example, 90/–/– means there is no requirement for an FRL for integrity and insulation.
Source - AS 2419.1-2005: Fire hydrant installations
Standards
performance criteria for fire resistance, i.e., the grading periods (in minutes) for the criteria specified in BCA, as —
  1. (a) structural adequacy;
  2. (b) integrity; and
  3. (c) insulation,
and expressed in that order
Source - AS 1720.4:2006: Timber structures
Standards
the nominal grading period, in minutes, that is determined by subjecting a specimen to the standard time temperature curve regime as set out in AS 1530.4 , to specify—
  1. (a) structural adequacy;
  2. (b) integrity; and
  3. (c) insulation,
and expressed in that order
For example, a building element with an FRL of 120/60/30 will maintain, when tested in accordance with AS 1530.4 —
  1. (a) structural adequacy for a period of 120 min;
  2. (b) integrity for a period of 60 min; and
  3. (c) insulation for a period of 30 min.
The structural adequacy criterion is not applied to doorsets and the FRL is expressed in terms of (–/YY/ZZ).
The fire resistance test applies a fourth criterion, radiation to fire-resistant doorsets, dampers and glazing, but the radiation grading period is not included in the statement of FRL given on the door-tag. For details on the use of the radiation criterion, see the NCC.
Source - AS 1905.1:2015: Components for the protection of openings in fire-resistant walls
Standards
the fire resistance level that a member can provide, in terms of structural adequacy, integrity and insulation, as defined in the NCC
Source - AS 5146.1:2015: Reinforced Autoclaved Aerated Concrete
Standards
the grading periods in minutes determined in accordance with AS 1530.4 for—
  1. (a) structural adequacy;
  2. (b) integrity; and
  3. (c) insulation,
expressed in that order
Source - AS 4254.1-2012: Ductwork for air-handling systems in buildings
Standards
the term used in Australia to describe the fire resistance of structural elements as determined in the standard test for fire resistance. It comprises three numbers giving the time for which each of the criteria of R, Structural Resistance, E, Integrity and I, Insulation are satisfied, and is presented always in that order, measured in minutes
Source - AS/NZS 2327:2017: Composite steel-concrete construction in buildings
Standards
fire resistance periods for structural adequacy, integrity and insulation expressed in that order
Fire resistance levels for structures, parts and elements of construction are specified by the relevant authority [e.g. in the Building Code of Australia (BCA)].
Source - AS 3600:2018: Concrete structures
Standards
fire resistance periods for structural adequacy, integrity and insulation, expressed in that order
Fire resistance levels for structures, parts and elements of construction are specified by the relevant authority, for example, in the Building Code of Australia (BCA).
Source - AS 3600:2018: Concrete structures
Standards
the nominal grading period, in minutes, that is determined by subjecting a specimen to the standard time temperature curve regime set out in this Standard, to specify—
  1. (a) structural adequacy;
  2. (b) integrity; and
  3. (c) insulation,

and expressed in that order
Source - AS 1530.4:2014: Methods for fire tests on building materials, components and structures
HB50
<2> means the grading periods in minutes determined in accordance with Specification A2.3 of BCA Volume One, for:
  1. (a) structural adequacy; and
  2. (b) integrity; and
  3. (c) insulation, and expressed in that order
Source - BCA Vol 2 terminology
A dash means that there is no requirement for that criterion. For example, 90/−/− means there is no requirement for an FRL for integrity and insulation.
<3> means the grading periods in minutes determined in accordance with Specification A2.3, for the following criteria
  1. (a) structural adequacy; and
  2. (b) integrity; and
  3. (c) insulation, and expressed in that order
Source - BCA Vol 1 terminology
A dash means that there is no requirement for that criterion. For example, 90/−/− means there is no requirement for an FRL for integrity and insulation, and −/−/- means there is no requirement for an FRL.
HB50
<1> grading period, in minutes, of building elements, as determined by a standard fire-resistance test for:
  1. (a) structural adequacy;
  2. (b) integrity; and
  3. (c) insulation; and expressed in that order (e.g. 60/60/30), or calculated from data obtained from such tests, or specified deemed-to-satisfy values.
FRLs for various building elements are specified in building regulations, e.g. in the BCA in Australia.