ISO/TR 12468-3:2014

External exposure of roofs to fire — Part 3: Commentary

ISO/TR 12468-3:2014 provides background and guidance on the use and limitations of the external fire exposure to roofs test method, the classification system, and the application of the data obtained. ISO/TR 12468-3:2014 is designed to be of assistance to code officials, fire safety engineers, designers of buildings, and other persons responsible for the safety of persons in and around buildings.

Exposition des toitures à un feu extérieur — Partie 3: Commentaire

General Information

• Status: Published
• Publication Date: 05-Aug-2014
• ICS: 13.220.50 - Fire-resistance of building materials and elements
• ICS: 91.060.20 - Roofs
• Technical Committee: ISO/TC 92/SC 2 - Fire containment
• Drafting Committee: ISO/TC 92/SC 2/WG 3 - Fire resistance tests for doors, shutters and glazed elements
• Current Stage: 6060 - International Standard published
• Start Date: 30-Jan-2015
• Completion Date: 06-Aug-2014

Standards Content (Sample)

TECHNICAL ISO/TR
REPORT 12468-3
First edition
2014-08-15
External exposure of roofs to fire —
Part 3:
Commentary
Exposition des toitures à un feu extérieur —
Partie 3: Commentaire
Reference number
ISO/TR 12468-3:2014(E)
©
ISO 2014

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ISO/TR 12468-3:2014(E)

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© ISO 2014
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ii © ISO 2014 – All rights reserved

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ISO/TR 12468-3:2014(E)

Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 ISO 12468-1, test method . 1
4 Fire scenarios . 1
5 Evaluation parameters . 5
6 ISO 12468‑2, classification of roofs. 6
Bibliography . 7
© ISO 2014 – All rights reserved iii

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ISO/TR 12468-3:2014(E)

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
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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).
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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.
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 2014 – All rights reserved

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ISO/TR 12468-3:2014(E)

Introduction
This part of ISO 12468 describes the background used in the development and ongoing revision of
ISO 12468-1:2013 and ISO 12468-2. Guidance is provided on the use of the test method and classification
methods.
© ISO 2014 – All rights reserved v

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TECHNICAL REPORT ISO/TR 12468-3:2014(E)
External exposure of roofs to fire —
Part 3:
Commentary
1 Scope
This part of ISO 12468 provides background and guidance on the use and limitations of the external
fire exposure to roofs test method, the classification system, and the application of the data obtained.
This part of ISO 12468 is designed to be of assistance to code officials, fire safety engineers, designers of
buildings, and other persons responsible for the safety of persons in and around buildings.
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 12468-1:2013, External exposure of roofs to fire — Part 1: Test method
3 ISO 12468-1, test method
In the development of the test method, an attempt was made to evaluate as many of the potential sources
of external fire exposure a roof system could be subjected to as possible. Once identified, the test method
attempted to define tests that simulated the identified possible exposure conditions, while at the same
time, utilizing tests that already exist and are described in national test methods.
The ultimate goal of the test method development was to create an international test procedure which
incorporated the most desirable elements of the existing test methods that could be used in national
regulations and replace the wide variety of test methods that exist in national regulations.
The following are the three levels of fire exposure for roofs defined in ISO 12468−1:2013:
— Level A: A large burning brand falling onto the roof from an adjacent building. Level A considers the
effect of wind and 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 the wind but without additional radiant heat.
The following presentation starts with a summary background description of some fire scenarios,
relevant for test
...