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Ref. NO. : ISO/R 717-1968 (E)
IS0
I NT ERN AT1 ON A L O RG A N IZATl O N FOR STAN DA RD IZATl ON
IS0 RECOMMENDATION
R 717
RATING OF SOUND INSULATION FOR DWELLINGS
1 st EDITION
May 1968
COPYRIGHT' RESERVED
The copyright of IS0 Recommendations and IS0 Standards
belongs to IS0 Member Bodies. Reproduction of these
documents. in any country, may be authorized therefore only
by the national standards organization of that country, being
a member of ISO.
For each individual country the only valid standard is the national standard of that country.
Printed in Switzerland
Also issued in French and Russian. Copies to be obtained through the national standards organizations.
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BRIEF HISTORY
The IS0 Recommendation R 717, Rating of sound insulation for dwellings, was drawn up by
Technical Committee ISOlTC 43, Acoustics, the Secretariat of which is held by the British Standards
Institution (BSI).
Work on this question by the Technical Committee began in 1962 and led, in 1964, to the
adoption of a Draft IS0 Recommendation.
In November 1965, this Draft IS0 Recommendation (No. 880) was circulated to all the IS0
Member Bodies for enquiry. It was approved, subject to a few modifications of an editorial nature,
by the following Member Bodies :
Argentina Germany Sweden
Australia Hungary Switzerland
Austria Israel U.A.R.
Brazil Japan United Kingdom
Canada U. S. S. R .
Net he rl an ds
Chile New Zealand Yugoslavia
Czechoslovakia Poland
6 Member Bodies opposed the approval of the Draft :
Belgium Italy
Denmark Norway
France U.S.A.
The Draft IS0 Recommendation was then submitted by correspondence to the IS0 Council
which decided, in May 1968, to accept it as an IS0 RECOMMENDATION.
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ISO/R 717-1968 (E)
IS0 Recommendation R 717 May 1968
ON FOR DWELLINGS
RATING OF SOUND INSULA1
INTRODUCTION
A method of measurement of airborne and impact sound insulation has been standardized in IS0
Recommendation R 140, Field and laboratory measurements of airborne and impact sound
transmission. This has enabled objective measurements by different laboratories to be compared.
The establishment of requirements for sound insulation and a method of determining whether
particular measured values satisfy these requirements are also necessary.
Various countries have their own methods of evaluation such as single figures, comparison curves
used as grades etc., which do not allow international comparisons to be made easily. It is the purpose
of this IS0 Recommendation to formalize a method of comparison which can be used internationally
and by means of which the individual countries can specify their own requirements for dwellings.
It is not intended that this method should restrict the choice of individual countries in setting up
their requirements.
1. SCOPE
This IS0 Recommendation describes a method of evaluating the airborne sound insulation and impact
sound level for dwellings when the results of measurements made by the method described inISO
Recommendation R 140 are available. Reference values are given with which the measured results
should be compared by the method described.
A method is given to derive from this comparison a single index, in terms of which the sound
insulation requirements can be defined.
2. DEFINITIONS
2.1 Airborne sound insulation
The quantity to be measured is
R'=L, -L + 10 loglo (S/A) dB
where
L is the average sound pressure level in the source room;
is the average sound pressure level in the receiving room;
L,
S is the common surface wall or floor area between the two rooms;
A is the equivalent absorption area of the receiving room.
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ISO/R 717-1968 (E)
The quantity *R ' is the transmission loss for field measurements and corresponds with the
normalized level difference taking the area S as reference absorption area(see IS0 Recommen-
dation R 140).
The corresponding value of R obtained from laboratory measurements may be useful for
guidance.
Where the common area is less than about 10 m2, or where no common partition wall surface
exists, the quantity S should be replaced by the reference absorption of 10 m2. In such cases
R ' is replaced by the normalized level difference Dn according to IS0 Recommendation R 140,
clause 3.5.
NOTES
1. nie vaiue of the quantity Dn specified in IS0 Recommendation R 140 for a particular construction
depends on its area. It is thought that the normalized quantity R', which does not vary so much in this
way, would be more appropriate for the purpose of comparison. The value of S is normally to be taken as
the area of the common part of the wall or floor. If there is any doubt as to the value of S, the relevant
details should be stated in the report.
2. Where measurements relate to a common area of less than about 10 m2, such measurements should not be
used for rating a construction if the result of this rating is to apply to cases where the area is 10 mz or
larger.
2.2 Impact sound
The normalized impact sound level to be measured is
Ln = L - 10 log10 (Ao/A) dB
where the reference absorption area A, is taken as 10 m2.
2.3 Airborne sound insulation index I,
Thisis the single figure in terms of which the airborne sound insulation performance is evaluated.
It is derived according to the procedure described in section 5 and defined in section 6. See also
the note to section 6 for another determination of rating Ma.
2.4 Impact sound index Ii
This is the corresponding figure for impact sound, also derived according to section 5 and
defined in section 6. See also the note t
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