External exposure of roofs to fire

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

General Information

Status
Published
Publication Date
05-Aug-2014
Current Stage
6060 - International Standard published
Start Date
26-Jun-2014
Completion Date
06-Aug-2014
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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)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2014

All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form

or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior

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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

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.

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
...

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