ISO 12468-1:2013

INTERNATIONAL ISO
STANDARD 12468-1
Second edition
2013-11-01
External exposure of roofs to fire —
Part 1:
Test method
Exposition des toitures à un feu extérieur —
Partie 1: Méthode d’essais
Reference number
©
ISO 2013
© ISO 2013
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ii © ISO 2013 – All rights reserved

Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Symbols . 3
5 Selection of test specimen pitch . 3
6 Test specimens. 3
6.1 General requirements . 3
6.2 Selection of standard supporting elements . 5
6.3 Positioning of joints . 6
6.4 Edge detailing . 7
7 Test equipment. 7
7.1 Exposure levels . 7
7.2 Brands . 8
7.3 Wind .10
7.4 Radiation .11
7.5 Timing device .11
7.6 Calibration element.11
7.7 Specimen holder .11
7.8 Gas burner . .15
7.9 Stand .17
8 Test conditions .17
8.1 Test environment .17
8.2 Calibration procedure .18
9 Conditioning and test preparation .18
9.1 Conditioning .18
9.2 Protection of the edges .19
10 Test procedure .19
10.1 General .19
10.2 Commencement of the test .19
10.3 Ignition and positioning of the brands .20
10.4 End of the test .21
10.5 Post-test examination .21
11 Observations and measurements .21
11.1 General .21
11.2 External fire spread .21
11.3 Fire penetration .21
11.4 Opening .21
11.5 Damage .22
12 Expression of test results.22
13 Test report .22
Annex A (normative) Direct field of application .24
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out
through ISO technical committees. Each member body interested in a subject for which a technical
committee has been established has the right to be represented on that committee. International
organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.
ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of
electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www.iso.org/patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation on the meaning of ISO specific terms and expressions related to conformity
assessment, as well as information about ISO’s adherence to the WTO principles in the Technical Barriers
to Trade (TBT) see the following URL: Foreword - Supplementary information
The committee responsible for this document is ISO/TC 92, Fire Safety, Subcommittee SC 2, Fire Containment.
This second edition cancels and replaces the first edition (ISO 12468–1:2003), of which it constitutes a
minor revision.
ISO 12468 consists of the following parts, under the general title External exposure of roofs to fire:
— Part 1: Test method
— Part 2: Classification of roofs
— Part 3: Commentary
iv © ISO 2013 – All rights reserved

Introduction
This part of ISO 12468 specifies a test method that relates to the effects of fires on roofs. The test method
described in this part of ISO 12468 represents the effect of three levels of fire exposure.
— Level A: A large burning brand coming from an adjacent building and falling onto the roof. Level A
considers the effects of wind and additional radiant heat.
— Level B: A medium burning brand coming from a fire in a neighbourhood and falling onto the roof.
Level B considers the effect of wind but without additional radiant heat.
— Level C: A small burning brand transported by the wind from a remote fire and falling onto the roof.
Level C considers the effect of wind but without additional radiant heat.
INTERNATIONAL STANDARD ISO 12468-1:2013(E)
External exposure of roofs to fire —
Part 1:
Test method
1 Scope
CAUTION — The attention of all persons concerned with managing and carrying out this fire test
is drawn to the fact that fire testing may be hazardous and that there is a possibility that toxic
and/or harmful smoke and gases may be evolved during the test. Mechanical and operational
hazards may also arise during the construction of the test elements or structures, their testing,
and disposal of test residues. An assessment of all potential hazards and risks to health shall be
made and safety precautions shall be identified and provided. Written safety instructions shall
be issued. Appropriate training shall be given to relevant personnel. Laboratory personnel shall
ensure that they follow written safety instructions at all times.
This part of ISO 12468 specifies a test method to determine the resistance of roofs to external exposure
to fire. This method evaluates the behaviour of the roof when exposed to three types of burning brands
combined with wind and with or without heat radiation, concerning
a) the fire spread across the external surface of the roof,
b) the fire spread within the roof,
c) the fire penetration, and
d) the production of flaming droplets or debris falling through the roof, from the underside of the roof,
or from the exposed surface.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any amendments) applies.
ISO 13943, Fire safety — Vocabulary
3 Terms and definitions
Fo
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