Acoustics - Rating of sound insulation in buildings and of building elements - Part 2: Impact sound insulation (ISO 717-2:2020)

This document
a) defines single-number quantities for impact sound insulation in buildings and of floors,
b) gives rules for determining these quantities from the results of measurements carried out in
one-third-octave bands in accordance with ISO 10140-3 and ISO 16283-2, and in octave bands in
accordance with that option in ISO 16283-2 for field measurements only,
c) defines single-number quantities for the impact sound reduction of floor coverings and floating
floors calculated from the results of measurements carried out in accordance with ISO 10140-3, and
d) specifies a procedure for evaluating the weighted reduction in impact sound pressure level by floor
coverings on lightweight floors.
The single-number quantities in accordance with this document are intended for rating impact
sound insulation and for simplifying the formulation of acoustical requirements in building codes. An
additional single-number evaluation in steps of 0,1 dB is indicated where it is needed for the expression
of uncertainty (except for spectrum adaptation terms). Numerical values of the single-number
quantities are specified where required for calculations.
The rating of measurements over an enlarged frequency range is given in Annex A.
A method for obtaining single-number quantities for bare heavy floors according to their performance
in combination with floor coverings is given in Annex B.
Example calculations of single-number quantities are given in Annex C.
The rating of measurements with a heavy and soft impact source (rubber ball) is given in Annex D.

Akustik - Bewertung der Schalldämmung in Gebäuden und von Bauteilen - Teil 2: Trittschalldämmung (ISO 717-2:2020)

Dieses Dokument
a) legt Einzahlangaben für die Trittschalldämmung in Gebäuden und von Decken fest,
b) enthält Regeln für die Ermittlung dieser Einzahlangaben aus den Ergebnissen von Messungen in Terzbändern nach ISO 10140 3 und ISO 16283 2 und in Oktavbändern entsprechend der zutreffenden Option in ISO 16283 2 ausschließlich für Messungen in Gebäuden,
c) legt Einzahlangaben für die Trittschallminderung durch Deckenauflagen und schwimmende Estriche fest, die aus den Ergebnissen von Messungen nach ISO 10140 3 berechnet wurden, und
d) legt ein Verfahren zur Ermittlung der bewerteten Trittschallpegelminderung durch Deckenauflagen auf leichten Decken fest.
Die Einzahlangaben nach diesem Dokument sind für die Bewertung der Trittschalldämmung und für die Vereinfachung der Formulierung von akustischen Anforderungen in Bauvorschriften vorgesehen. Wenn erforderlich, ist zum Zwecke der Angabe der Unsicherheit die Ermittlung einer zusätzlichen Einzahlangabe in 0,1 dB-Schritten enthalten (ausgenommen sind die Spektrum-Anpassungswerte). Wenn für Berechnungen erforderlich, werden numerische Werte der Einzahlangaben für verschiedene Bedürfnisse festgelegt.
Die Bewertung der Messungen über einen erweiterten Frequenzbereich wird in Anhang A angegeben.
Ein Verfahren zur Bestimmung von Einzahlangaben für massive Rohdecken entsprechend ihrer Leistung in Kombination mit Deckenauflagen wird in Anhang B angegeben.
Beispielberechnungen von Einzahlangaben werden in Anhang C angegeben.
Die Bewertung der Messungen mit einer schweren und weichen Trittschallquelle (Gummiball) ist in Anhang D angegeben.

Acoustique - Évaluation de l'isolement acoustique des immeubles et des éléments de construction - Partie 2: Protection contre le bruit de choc (ISO 717-2:2020)

Akustika - Vrednotenje zvočne izolirnosti v stavbah in zvočne izolirnosti gradbenih elementov - 2. del: Izolirnost pred udarnim zvokom (ISO 717-2:2020)

General Information

Status
Published
Public Enquiry End Date
09-Mar-2020
Publication Date
26-Jan-2021
Technical Committee
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
07-Jan-2021
Due Date
14-Mar-2021
Completion Date
27-Jan-2021

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SLOVENSKI STANDARD
SIST EN ISO 717-2:2021
01-marec-2021
Nadomešča:
SIST EN ISO 717-2:2013

Akustika - Vrednotenje zvočne izolirnosti v stavbah in zvočne izolirnosti gradbenih

elementov - 2. del: Izolirnost pred udarnim zvokom (ISO 717-2:2020)

Acoustics - Rating of sound insulation in buildings and of building elements - Part 2:

Impact sound insulation (ISO 717-2:2020)
Akustik - Bewertung der Schalldämmung in Gebäuden und von Bauteilen - Teil 2:
Trittschalldämmung (ISO 717-2:2020)

Acoustique - Évaluation de l'isolement acoustique des immeubles et des éléments de

construction - Partie 2: Protection contre le bruit de choc (ISO 717-2:2020)
Ta slovenski standard je istoveten z: EN ISO 717-2:2020
ICS:
91.120.20 Akustika v stavbah. Zvočna Acoustics in building. Sound
izolacija insulation
SIST EN ISO 717-2:2021 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN ISO 717-2:2021
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SIST EN ISO 717-2:2021
EN ISO 717-2
EUROPEAN STANDARD
NORME EUROPÉENNE
December 2020
EUROPÄISCHE NORM
ICS 91.120.20 Supersedes EN ISO 717-2:2013
English Version
Acoustics - Rating of sound insulation in buildings and of
building elements - Part 2: Impact sound insulation (ISO
717-2:2020)

Acoustique - Évaluation de l'isolement acoustique des Akustik - Bewertung der Schalldämmung in Gebäuden

immeubles et des éléments de construction - Partie 2: und von Bauteilen - Teil 2: Trittschalldämmung (ISO

Protection contre le bruit de choc (ISO 717-2:2020) 717-2:2020)
This European Standard was approved by CEN on 12 December 2020.

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, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,

Poland, Portugal, Republic of North Macedonia, Romania, Serbia, 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: Rue de la Science 23, B-1040 Brussels

© 2020 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 717-2:2020 E

worldwide for CEN national Members.
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SIST EN ISO 717-2:2021
EN ISO 717-2:2020 (E)
Contents Page

European foreword ....................................................................................................................................................... 3

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SIST EN ISO 717-2:2021
EN ISO 717-2:2020 (E)
European foreword

This document (EN ISO 717-2:2020) 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 June 2021, and conflicting national standards shall be

withdrawn at the latest by June 2021.

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. CEN shall not be held responsible for identifying any or all such patent rights.

This document supersedes EN ISO 717-2:2013.

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, France, Germany, Greece, Hungary, Iceland,

Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of

North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the

United Kingdom.
Endorsement notice

The text of ISO 717-2:2020 has been approved by CEN as EN ISO 717-2:2020 without any modification.

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SIST EN ISO 717-2:2021
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SIST EN ISO 717-2:2021
INTERNATIONAL ISO
STANDARD 717-2
Fourth edition
2020-12
Acoustics — Rating of sound
insulation in buildings and of building
elements —
Part 2:
Impact sound insulation
Acoustique — Évaluation de l'isolement acoustique des immeubles et
des éléments de construction —
Partie 2: Protection contre le bruit de choc
Reference number
ISO 717-2:2020(E)
ISO 2020
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SIST EN ISO 717-2:2021
ISO 717-2:2020(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2020

All rights reserved. Unless otherwise specified, or required in the context of its implementation, 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
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2020 – All rights reserved
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SIST EN ISO 717-2:2021
ISO 717-2:2020(E)
Contents Page

Foreword ........................................................................................................................................................................................................................................iv

Introduction ..................................................................................................................................................................................................................................v

1 Scope ................................................................................................................................................................................................................................. 1

2 Normative references ...................................................................................................................................................................................... 1

3 Terms and definitions ..................................................................................................................................................................................... 2

4 Procedure for evaluating single-number quantities for impact sound insulation rating ........3

4.1 General ........................................................................................................................................................................................................... 3

4.2 Reference values .................................................................................................................................................................................... 4

4.3 Method of comparison ..................................................................................................................................................................... 4

4.3.1 Measurements in one-third-octave bands ................................................................................................. 4

4.3.2 Measurements in octave bands ........................................................................................................................... 5

4.4 Statement of results ............................................................................................................................................................................ 5

4.5 Impact sound insulation measured with heavy and soft impact sources ............................................ 6

5 Procedure for evaluating the weighted reduction in impact sound pressure level by

floor coverings on bare heavy floors ............................................................................................................................................... 7

5.1 General ........................................................................................................................................................................................................... 7

5.2 Reference floor ........................................................................................................................................................................................ 7

5.3 Calculation .................................................................................................................................................................................................. 8

5.4 Statement of results ............................................................................................................................................................................ 9

6 Procedure for evaluating the weighted reduction in impact sound pressure level by

floor coverings on lightweight floors .............................................................................................................................................. 9

6.1 General ........................................................................................................................................................................................................... 9

6.2 Reference curves for the reference lightweight floors used to calculate ΔL .................................

t,w 9

6.3 Calculation ...............................................................................................................................................................................................10

6.4 Statement of results .........................................................................................................................................................................10

Annex A (informative) Additional weighting procedure ..............................................................................................................11

Annex B (informative) Procedure for evaluating the equivalent weighted normalized

impact sound pressure level of bare heavy floors ..........................................................................................................14

Annex C (informative) Examples of the evaluation of a single-number quantity ...............................................16

Annex D (normative) Rating method for impact sound insulation measured with a heavy

and soft impact source ................................................................................................................................................................................20

Bibliography .............................................................................................................................................................................................................................23

© ISO 2020 – All rights reserved iii
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SIST EN ISO 717-2:2021
ISO 717-2:2020(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 of the voluntary nature of standards, the meaning of ISO specific terms and

expressions related to conformity assessment, as well as information about ISO's adherence to the

World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT), see www .iso .org/

iso/ foreword .html.

This document was prepared by Technical Committee ISO/TC 43, Acoustics, Subcommittee SC 2,

Building acoustics, in collaboration with the European Committee for Standardization (CEN) Technical

Committee CEN/TC 126, Acoustic properties of building elements and of buildings, in accordance with the

Agreement on technical cooperation between ISO and CEN (Vienna Agreement).

This fourth edition cancels and replaces the third edition (ISO 717-2:2013), which has been technically

revised.
The main changes compared to the previous edition are as follows:

— A new Annex D with a method for rating heavy/soft impact sound insulation using an A-weighted

maximum impact sound pressure level.
A list of all parts in the ISO 717 series can be found on the ISO website.

Any feedback or questions on this document should be directed to the user’s national standards body. A

complete listing of these bodies can be found at www .iso .org/ members .html.
iv © ISO 2020 – All rights reserved
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SIST EN ISO 717-2:2021
ISO 717-2:2020(E)
Introduction

Methods of measurement of impact sound insulation in buildings and of building elements have

been standardized in ISO 10140-3 and ISO 16283-2. These methods give values for the impact sound

insulation which are frequency dependent. The purpose of this document is to standardize a method

whereby the frequency-dependent values of impact sound insulation can be converted into a single

number characterizing the acoustical performance.
© ISO 2020 – All rights reserved v
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SIST EN ISO 717-2:2021
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SIST EN ISO 717-2:2021
INTERNATIONAL STANDARD ISO 717-2:2020(E)
Acoustics — Rating of sound insulation in buildings and of
building elements —
Part 2:
Impact sound insulation
1 Scope
This document

a) defines single-number quantities for impact sound insulation in buildings and of floors,

b) gives rules for determining these quantities from the results of measurements carried out in

one-third-octave bands in accordance with ISO 10140-3 and ISO 16283-2, and in octave bands in

accordance with that option in ISO 16283-2 for field measurements only,

c) defines single-number quantities for the impact sound reduction of floor coverings and floating

floors calculated from the results of measurements carried out in accordance with ISO 10140-3, and

d) specifies a procedure for evaluating the weighted reduction in impact sound pressure level by floor

coverings on lightweight floors.

The single-number quantities in accordance with this document are intended for rating impact

sound insulation and for simplifying the formulation of acoustical requirements in building codes. An

additional single-number evaluation in steps of 0,1 dB is indicated where it is needed for the expression

of uncertainty (except for spectrum adaptation terms). Numerical values of the single-number

quantities are specified where required for calculations.
The rating of measurements over an enlarged frequency range is given in Annex A.

A method for obtaining single-number quantities for bare heavy floors according to their performance

in combination with floor coverings is given in Annex B.
Example calculations of single-number quantities are given in Annex C.

The rating of measurements with a heavy and soft impact source (rubber ball) is given in Annex D.

2 Normative references

The following documents are referred to in the text in such a way that some or all of their content

constitutes requirements of this document. For dated references, only the edition cited applies. For

undated references, the latest edition of the referenced document (including any amendments) applies.

ISO 10140-1, Acoustics — Laboratory measurement of sound insulation of building elements — Part 1:

Application rules for specific products

ISO 10140-3:2010, Acoustics — Laboratory measurement of sound insulation of building elements —

Part 3: Measurement of impact sound insulation

ISO 10140-5, Acoustics — Laboratory measurement of sound insulation of building elements — Part 5:

Requirements for test facilities and equipment

ISO 12999-1, Acoustics — Determination and application of measurement uncertainties in building

acoustics — Part 1: Sound insulation
© ISO 2020 – All rights reserved 1
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SIST EN ISO 717-2:2021
ISO 717-2:2020(E)

ISO 16283-2:2018, Acoustics — Field measurement of sound insulation in buildings and of building

elements — Part 2: Impact sound insulation
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at http:// www .electropedia .org/
3.1
single-number quantity for impact sound insulation rating

value of the relevant reference curve at 500 Hz after shifting it in accordance with the method specified

in 4.3.1 or the value of the relevant reference curve at 500 Hz after shifting it in accordance with the

method specified in 4.3.2, reduced by 5 dB

Note 1 to entry: Terms and symbols for the single-number quantity used depend on the type of measurement.

Examples are listed in Table 1 for impact sound insulation properties of building elements and in Table 2 for

impact sound insulation in buildings. In general, new single-number quantities are derived in a similar way.

Note 2 to entry: This quantity is expressed in decibels.
3.2
spectrum adaptation term

value to be added to the single-number quantity (e.g. L ) to take account of the unweighted impact

sound level, thereby representing the characteristics of typical walking noise spectra

Note 1 to entry: This quantity is expressed in decibels.
3.3
weighted reduction in impact sound pressure level

difference between the weighted normalized impact sound pressure levels derived with a bare heavy

reference floor or a lightweight reference floor, without and with a floor covering

Note 1 to entry: The quantity derived with a bare heavy reference floor is denoted by ΔL and is expressed in

decibels.

Note 2 to entry: The quantity derived with a lightweight reference floor is denoted by ΔL and is expressed in

t,w

decibels. According to the type of reference floor it is denoted as ΔL , ΔL , ΔL .

t1,w t2,w t3,w
3.4
equivalent weighted normalized impact sound pressure level of a bare heavy floor
n,eq,0,w

sum of the weighted normalized impact sound pressure level of the bare floor under test with the

reference floor covering and the weighted reduction in impact sound pressure level of the reference

floor covering

Note 1 to entry: This quantity is calculated in accordance with the method specified in this document.

Note 2 to entry: This quantity is expressed in decibels.
3.5
A-weighted maximum impact sound pressure level
iA,Fmax

A-weighted maximum impact sound pressure level determined with Fast time-weighting when

measured with a heavy and soft impact source, the rubber ball
Note 1 to entry: This quantity is expressed in decibels.
2 © ISO 2020 – All rights reserved
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SIST EN ISO 717-2:2021
ISO 717-2:2020(E)
Note 2 to entry: For field measurements it is denoted as L' .
i,Fmax

Note 3 to entry: It is determined as described in ISO 10140-3, ISO 10140-5 or ISO 16283-2. The reported values

are averaged over all receiving points and all source positions.
3.6
Standardized A-weighted maximum impact sound pressure level
iA,Fmax,V,T

A-weighted maximum impact sound pressure level determined with Fast time-weighting when

measured with a heavy and soft impact source, the rubber ball, and increased by a correction term for

room volume and reduced by a correction term for reverberation time and Fast time weighting

Note 1 to entry: This quantity is expressed in decibels.
Note 2 to entry: For field measurements it is denoted as L' .
i,Fmax,V,T

Note 3 to entry: It is determined as described in ISO 10140-3, ISO 10140-5 or ISO 16283-2. The reported values

are averaged over all receiving points and all source positions.
4 Procedure for evaluating single-number quantities for impact sound
insulation rating
4.1 General

The values obtained in accordance with ISO 10140-3 and ISO 16283-2 are compared with reference

values (see 4.2) at the frequencies of measurement within the range 100 Hz to 3 150 Hz for measurements

in one-third-octave bands or 125 Hz to 2 000 Hz for measurements in octave bands.

The comparison shall be carried out in accordance with 4.3.
Table 1 — Single-number quantity for impact sound insulation of floors
Derived from one-third-octave band values
Defined in
Single-number quantity Term and symbol
Weighted normalized impact Normalized impact sound pressure
ISO 10140-3:2010 Formula (1)
sound pressure level, L level, L
n,w n
Table 2 — Single-number quantities for impact sound insulation in buildings
Derived from one-third-octave band or octave band values
Defined in
Single-number quantity Term and symbol
Weighted normalized impact
Normalized impact sound pressure
ISO 16283-2:2018 Formula (3)
sound pressure level, L ′
level, L
nw,
Weighted standardized impact
Standardized impact sound
ISO 16283-2:2018 Formula (1)
sound pressure level, L ′
pressure level, L
nwT,
© ISO 2020 – All rights reserved 3
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SIST EN ISO 717-2:2021
ISO 717-2:2020(E)
4.2 Reference values

The set of reference values used for comparison with measurement results shall be as given in Table 3.

The reference curves are shown in Figures 1 and 2.

NOTE The reference values for the octave bands 125 Hz to 1 000 Hz are equivalent to the energetic sum

(rounded to integers) of these for the relevant one-third-octave band. The energetic sum from one-third-octave

bands 800 Hz, 1 000 Hz and 1250 Hz is 61,41 dB which is rounded to 61 dB. Despite this, the reference value for

the octave band 1 000 Hz is 62 dB to keep it consistent with older versions of this standard. The reference value

for the octave band 2 000 Hz has been reduced to take care of the one-third-octave band 3 150 Hz, which (for

bare heavy floors) can contribute considerably to the unfavourable deviations.
4.3 Method of comparison
4.3.1 Measurements in one-third-octave bands
′ ′

To evaluate the results of a measurement of L , L or L in one-third-octave bands, the measurement

n nT

data shall be given to one decimal place. Shift the reference curve in increments of 1 dB (0,1 dB for the

purpose of expression of uncertainty) towards the measured curve until the sum of unfavourable

deviations is as large as possible but not more than 32,0 dB.

An unfavourable deviation at a particular frequency occurs when the results of measurements exceed

the reference value. Only the unfavourable deviations shall be taken into account.

The value, in decibels, of the reference curve at 500 Hz, after shifting it in accordance with this

′ ′
procedure, is L , L or L respectively.
n,w
nw, nwT,
Table 3 — Reference values for impact sound
Reference values
Frequency
Hz One-third-octave bands Octave bands
100 62
125 62 67
160 62
200 62
250 62 67
315 62
400 61
500 60 65
630 59
800 58
1 000 57 62
1 250 54

1) The different parts of ISO 10140 and ISO 16283 state that the results shall be reported “to one decimal place”.

However, if the octave or one-third-octave values have been reported with more than one decimal digit, the values

shall be reduced to one decimal place before use in the calculation of the single number rating. This is done by taking

the value in tenths of a decibel closest to the reported values: XX,XYZ ZZ … is rounded to XX,X if Y is less than 5 and

to XX,X + 0,1 if Y is equal to or greater than 5. Software developers should ensure that this reduction applies to the

true input values and not only to the displayed precision (as shown on the screen or printed on paper). Generally

this can be implemented by the following sequence of instructions: multiply the (positive) number XX,XYZ ZZ … by

[1]

10 and add 0,5, take the integer part and then divide the result by 10. For further details see ISO 80000-1 .

4 © ISO 2020 – All rights reserved
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SIST EN ISO 717-2:2021
ISO 717-2:2020(E)
Table 3 (continued)
Reference values
Frequency
Hz One-third-octave bands Octave bands
1 600 51
2 000 48 49
2 500 45
3 150 42
4.3.2 Measurements in octave bands
′ ′

To evaluate the results of a measurement of L or L in octave bands, the measurement data shall be

n nT

given to one decimal place. Shift the reference curve in increments of 1 dB (0,1 dB for the purpose of

expression of uncertainty) towards the measured curve until the sum of unfavourable deviations is as

large as possible but not more than 10,0 dB.

The value, in decibels, of the reference curve at 500 Hz, after shifting it in accordance with this

′ ′
procedure and then reducing it by 5 dB is L or L , respectively.
nw, nwT,

An unfavourable deviation at a particular frequency occurs when the results of measurements exceed

the reference value. Take into account only the unfavourable deviations.
4.4 Statement of results

The appropriate single-number quantity shall be given with reference to this document. The results of

measurements shall also be given in the form of a diagram as specified in ISO 10140-3 and ISO 16283-2.

The uncertainty of the weighted single-number quantities may also be stated, in accordance with

ISO 12999-1. In this case the numbers shall be given to one decimal place.
EXAMPLE
L = 53,21± ,0
n,w
Spectrum adaptation terms do not have uncertainty values of their own.

For field measurements in accordance with ISO 16283-2, it shall be stated whether the single-number

quantity is calculated from results in one-third-octave bands or octave bands. In general, there can

be differences between single-number quantities calculated from one-third octave or octave band

measurements of about ±1 dB. Ratings based on one-third octave band measurements are preferred.

© ISO 2020 – All rights reserved 5
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SIST EN ISO 717-2:2021
ISO 717-2:2020(E)
Key
f frequency, in Hz
L reference value, in dB
Figure 1 — Curve of reference values for impact sound, one-third octave bands
Key
f frequency, in Hz
L reference value, in dB
Figure 2 — Curve of reference values for impact sound, octave bands
4.5 Impact sound insulation measured with heavy and soft impact sources

When impact measurements are carried out using the rubber ball as an impact source as described in

ISO 10140-3 or ISO 16283-2, the rating method to determine the single-number quantity, which is an

A-weighted maximum impact sound pressure level, shall be calculated according to Annex D.

6 © ISO 2020 – All rights reserved
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SIST EN ISO 717-2:2021
ISO 717-2:2020(E)
5 Procedure for evaluating the weighted reduction in impact sound pressure
level by floor coverings on bare heavy floors
5.1 General

The reduction of impact sound pressure level (improvement of impact sound insulation), ΔL, of floor

coverings when tested on a homogeneous concrete slab floor as described in ISO 10140-1 is independent

of the normalized impact sound pressure level of the bare floor, L . However, the weighted normalized

n,0

impact sound pressure levels of the floor with and without a floor covering depend to some extent on

L . In order to obtain comparable values for ΔL between laboratories, it is therefore necessary to

n,0 w
relate the measured values of ΔL to a reference floor.
5.2 Reference floor
The reference flo
...

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