EN ISO 12999-1:2014

SLOVENSKI STANDARD
01-september-2014
1DGRPHãþD
SIST EN 20140-2:1997
$NXVWLND8JRWDYOMDQMHLQXSRUDEDPHULOQHQHJRWRYRVWLYJUDGEHQLDNXVWLNLGHO
=YRþQDL]ROLUQRVW,62
Acoustics - Determination and application of measurement uncertainties in building
acoustics - Part 1: Sound insulation (ISO 12999-1:2014)
Akustik - Bestimmung und Anwendung der Messunsicherheiten in der Bauakustik - Teil
1: Schalldämmung (ISO 12999-1:2014)
Acoustique - Détermination et application des incertitudes de mesure dans l'acoustique
des bâtiments - Partie 1: Isolation acoustique (ISO 12999-1:2014)
Ta slovenski standard je istoveten z: EN ISO 12999-1:2014
ICS:
17.140.01 $NXVWLþQDPHUMHQMDLQ Acoustic measurements and
EODåHQMHKUXSDQDVSORãQR noise abatement in general
91.120.20 $NXVWLNDYVWDYEDK=YRþQD Acoustics in building. Sound
L]RODFLMD insulation
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN ISO 12999-1
NORME EUROPÉENNE
EUROPÄISCHE NORM
May 2014
ICS 17.140.01; 91.120.20 Supersedes EN 20140-2:1993
English Version
Acoustics - Determination and application of measurement
uncertainties in building acoustics - Part 1: Sound insulation (ISO
12999-1:2014)
Acoustique - Détermination et application des incertitudes Akustik - Bestimmung und Anwendung der
de mesure dans l'acoustique des bâtiments - Partie 1: Messunsicherheiten in der Bauakustik - Teil 1:
Isolation acoustique (ISO 12999-1:2014) Schalldämmung (ISO 12999-1:2014)
This European Standard was approved by CEN on 17 April 2014.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European
Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national
standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN member.

This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management Centre has the same
status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United
Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2014 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 12999-1:2014 E
worldwide for CEN national Members.

Contents Page
Foreword .3
Foreword
This document (EN ISO 12999-1:2014) has been prepared by Technical Committee ISO/TC 43 "Acoustics" in
collaboration with Technical Committee CEN/TC 126 “Acoustic properties of building elements and of
buildings” the secretariat of which is held by AFNOR.
This European Standard shall be given the status of a national standard, either by publication of an identical
text or by endorsement, at the latest by November 2014, and conflicting national standards shall be withdrawn
at the latest by November 2014.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN 20140-2:1993.
According to the CEN-CENELEC Internal Regulations, the national standards organizations of the following
countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech
Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece,
Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,
Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom.
Endorsement notice
The text of ISO 12999-1:2014 has been approved by CEN as EN ISO 12999-1:2014 without any modification.

INTERNATIONAL ISO
STANDARD 12999-1
First edition
2014-05-15
Acoustics — Determination and
application of measurement
uncertainties in building acoustics —
Part 1:
Sound insulation
Acoustique — Détermination et application des incertitudes de
mesure dans l’acoustique des bâtiments —
Partie 1: Isolation acoustique
Reference number
ISO 12999-1:2014(E)
©
ISO 2014
ISO 12999-1:2014(E)
© 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
written permission. Permission can be requested from either ISO at the address below or ISO’s member body in the country of
the requester.
ISO copyright office
Case postale 56 • CH-1211 Geneva 20
Tel. + 41 22 749 01 11
Fax + 41 22 749 09 47
E-mail copyright@iso.org
Web www.iso.org
Published in Switzerland
ii © ISO 2014 – All rights reserved

ISO 12999-1:2014(E)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Detailed uncertainty budget . 3
5 Uncertainty determination by inter-laboratory measurements . 3
5.1 General . 3
5.2 Measurement situations . 3
5.3 Measurement conditions . . 4
5.4 Number of participating laboratories . 4
5.5 Stating the test results of inter-laboratory measurements . 4
5.6 Choice of test specimen . 4
5.7 Laboratories with outlying measurement results . 5
5.8 Verification of laboratory results by results of inter-laboratory tests . 5
6 Uncertainties associated with single-number values . 7
7 Standard uncertainties for typical measurands . 7
7.1 General . 7
7.2 Airborne sound insulation . 7
7.3 Impact sound insulation . 8
7.4 Reduction of transmitted impact noise by floor coverings . 9
8 Application of the uncertainties .10
Annex A (informative) Example of handling uncertainties in building acoustics .12
Annex B (informative) Example for the calculation of the uncertainty of single number values .15
Annex C (informative) Detailed uncertainty budget .18
Bibliography .20
ISO 12999-1:2014(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 43, Acoustics, Subcommittee SC 2, Building
acoustics.
This first edition of ISO 12999-1 cancels and replaces ISO 140-2:1991, which has been technically revised.
It also incorporates the Technical Corrigendum ISO 140-2:1991/Cor 1:1993.
ISO 12999 consists of the following parts, under the general title Acoustics — Determination and
application of measurement uncertainties in building acoustics:
— Part 1: Sound insulation
A part 2 dealing with sound absorption is under preparation.
iv © ISO 2014 – All rights reserved

ISO 12999-1:2014(E)
Introduction
An assessment of uncertainties that is comprehensible and close to reality is indispensable for many
questions in building acoustics. Whether a requirement is met, a laboratory delivers correct results
or the acoustic properties of a product are better than the same properties of some other product
can be decided only by adequately assessing the uncertainties associated with the quantities under
consideration.
Uncertainties should preferably be determined following the principles of ISO/IEC Guide 98-3. This Guide
specifies a detailed procedure for the uncertainty evaluation that is based upon a complete mathematical
model of the measurement procedure. At the current knowledge, it seems to be impossible to formulate
these models for the different quantities in building acoustics. Therefore, only the principles of such an
uncertainty assessment are explained.
To come to uncertainties all the same, the concept of reproducibility and repeatability is incorporated
which is the traditional way of uncertainty determination in building acoustics. This concept offers
the possibility to state the uncertainty of a method and of measurements carried out according to the
method, based on the results of inter-laboratory measurements.
INTERNATIONAL STANDARD ISO 12999-1:2014(E)
Acoustics — Determination and application of
measurement uncertainties in building acoustics —
Part 1:
Sound insulation
1 Scope
This part of ISO 12999 specifies procedures for assessing the measurement uncertainty of sound
insulation in building acoustics. It provides for
— a detailed uncertainty assessment;
— a determination of uncertainties by inter-laboratory tests;
— an application of uncertainties.
Furthermore, typical uncertainties are given for quantities determined according to ISO 10140,
ISO 140-4, ISO 140-5, ISO 140-7 and ISO 717 (all parts).
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 140-4, Acoustics — Measurement of sound insulation in buildings and of building elements — Part 4:
Field measurements of airborne sound insulation between rooms
ISO 140-5, Acoustics — Measurement of sound insulation in buildings and of building elements — Part 5:
Field measurements of airborne sound insulation of façade elements and façades
ISO 140-7, Acoustics — Measurement of sound insulation in buildings and of building elements — Part 7:
Field measurements of impact sound insulation of floors
ISO 717 (all parts), Acoustics — Rating of sound insulation in buildings and of building elements
ISO 5725-1:1994, Accuracy (trueness and precision) of measurement methods and results — Part 1: General
principles and definitions
ISO 5725-2:1994, Accuracy (trueness and precision) of measurement methods and results — Part 2: Basic
method for the determination of repeatability and reproducibility of a standard measurement method
ISO 10140 (all parts), Acoustics — Laboratory measurement of sound insulation of building elements
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
[1]
NOTE Whenever applicable, they are equivalent to those given in ISO 5725-1, in the ISO/IEC Guide 98-3 and
[2]
in ISO/IEC Guide 99.
ISO 12999-1:2014(E)
3.1
measurand
particular quantity subject to measurement, e.g. the airborne sound insulation of a particular window
pane determined in accordance with ISO 10140
3.2
measurement result
value attributed to a measurand, obtained by following the complete set of instructions given in a
measurement procedure
Note 1 to entry: The measurement result may be a frequency band level or a single number value determined
according to the rating procedures of ISO 717 (all parts).
3.3
uncertainty
parameter, associated with the result of a measurement, that characterizes the dispersion of the values
that can reasonably be attributed to the measurand
3.4
standard uncertainty
u
uncertainty of the result of a measurement expressed as a standard deviation
3.5
combined standard uncertainty
u
c
standard uncertainty of the result of a measurement when that result is obtained from the values of
a number of other quantities, equal to the positive square root of a sum of terms, the terms being the
variances or covariances of these other quantities weighted according to how the measurement result
varies with changes in these quantities
3.6
expanded uncertainty
U
quantity defining an interval about the result of a measurement that may be expected to encompass a
large fraction of the distribution of values that can reasonably be attributed to the measurand
3.7
coverage factor
k
numerical factor used as a multiplier of the combined standard uncertainty in order to obtain an
expanded uncertainty
3.8
repeatability condition
condition of measurement that includes the same measurement procedure, same operators, same
measuring system, same location (laboratory or usual building), and replicate measurements on the
same object over a short period of time
3.9
repeatability standard deviation
σ
r
standard deviation of measurement results obtained under repeatability conditions
3.10
reproducibility condition
condition of measurement that includes different locations (laboratories or usual buildings), operators,
measuring systems, and replicate measurements on the same or similar objects
2 © ISO 2014 – All rights reserved

ISO 12999-1:2014(E)
3.11
reproducibility standard deviation
σ
R
standard deviation of measurement results obtained under reproducibility conditions
3.12
in-situ condition
condition of measurement that includes the same location (laboratory or usual building), and replicate
measurements on the same object by different operators using different measuring systems
3.13
in-situ standard deviation
σ
situ
standard deviation of measurement results obtained under in-situ conditions
4 Detailed uncertainty budget
The derivation of a detailed uncertainty budget is desirable to find out which uncertainty contributions
are the most important ones and how these contributions can be reduced. Furthermore, such a budget
reflects the individual sound fields during the measurement. Consequently, the uncertainty is valid for
an individual measurement result and not for a whole family of results. Annex C gives provisions on the
derivation of such uncertainty budgets.
5 Uncertainty determination by inter-laboratory measurements
5.1 General
Standard deviations determined by inter-laboratory measurements may serve as an estimate for the
standard uncertainty. The general concept and the procedure for determining these standard deviations
are given in ISO 5725-1 and ISO 5725-2, respectively. As many operators and laboratories as possible
should participate in such inter-laboratory measurements in order to obtain reliable results.
5.2 Measurement situations
In building acoustics, three different measurement situations are to be distinguished.
a) Situation A is that a building element is characterized by laboratory measurements. In this case, the
measurand is defined by the relevant part of ISO 10140, including all additional requirements e.g.
for the measurement equipment and especially for the test facilities. Therefore, all measurement
results that are obtained in another test facility or building also comply with this definition. The
standard uncertainty, thus, is the standard deviation of reproducibility as determined by inter-
laboratory measurements.
b) Situation B is described by the case that different measurement teams come to the same location
to carry out measurements. The location may be a usual building or a test facility. The measurand,
thus, is a property of one particular element in one particular test facility or the property of a
building. The main difference to situation A is that many aspects of the airborne and structure-
borne sound fields involved remain constant since the physical construction is unchanged. The
standard uncertainty obtained for this situation is called in situ standard deviation.
c) Situation C applies to the case when the measurement is simply repeated in the same location by the
same operator using the same equipment. The location may be a usual building or a test facility. The
standard uncertainty is the standard deviation of repeatability as determined by inter-laboratory
measurements.
ISO 12999-1:2014(E)
5.3 Measurement conditions
The acoustical measurement conditions for determining the different standard deviations shall
correspond to the conditions given in the standardized measurement procedures. The test specimen
shall not be remounted between repeated measurements.
Each laboratory shall use its normal measurement procedure when participating in an inter-
laboratory measurement. No deviations from the test procedure laid down shall occur but repeating
the measurements several times, the parameters left open in the measurement procedure shall be
represented as well as possible. In particular, the set of microphone positions and source positions over
which averaging is carried out for one measurement shall be selected anew, more or less randomly,
for each repeated measurement. This is necessary to obtain a mean value and a standard deviation of
repeatability that represent the situation correctly.
Before the inter-laboratory measurement is started, each participating laboratory shall report the exact
details of its test procedure.
Additional requirements for carrying out inter-laboratory measurements for the test specimen chosen
shall be laid down in detail. This refers in particular to the following items:
— quantities being measured and reported, rules for rounding numbers;
— number of repeated measurements required;
— calibration of the measurement equipment;
— mounting and sealing conditions of the test specimen, and curing time where appropriate.
5.4 Number of participating laboratories
The number of laboratories, p, shall, from a statistical point of view, be at least eight, but is preferable
to exceed this number in order to reduce the number of replicate measurements required. The number,
n, of measurements in each laboratory should be so chosen that p(n - 1) ≥ 35. In addition, at least
five test results are needed for each laboratory. If the number n of measurements is different among
the participating laboratories, a mean number of measurements shall be calculated and used (see
ISO 5725-2). The measurement results obtained shall not be pre-selected in any way by the participating
laboratories before they are reported.
5.5 Stating the test results of inter-laboratory measurements
In order to simplify the evaluation of measurement results reported, it is strongly desirable to supply
forms for filling in by the participants. For the statistical analysis, it is important to report special
observations and/or any irregularities observed during the test.
5.6 Choice of test specimen
5.6.1 General
The kind of test specimen used for an inter-laboratory measurement depends not only on the quantity
being tested (i.e. airborne sound reduction index, normalized impact sound pressure level) but specifically
on the mounting and measurement conditions for which the standard deviation of repeatability and
reproducibility are being obtained (e.g. walls, floors, windows). Effects influencing the measurement
result, like ageing or a strong dependence on humidity or temperature, shall also be considered.
The choice of test specimen also depends on practical considerations. In general, three different
approaches (see 5.6.2 to 5.6.4) depending on the type of measurement method and/or on the type of
specimen can be appropriate.
4 © ISO 2014 – All rights reserved

ISO 12999-1:2014(E)
5.6.2 Use of single test specimen — Same material circulated among participants
For checking the measurement procedure and the facilities in different laboratories, ideally, the same
test specimen should be used by all participants in the inter-laboratory measurement and checked again
by the first laboratory at the end of the inter-la
...