Sound insulation of multi-storey houses: Summary of impact sound insulation

Juhani Parmanen, Pekka Sipari, Seppo Uosukainen

Research output: Book/ReportReport

Abstract

Problems connected with the sound insulation of wooden multi-storey buildings are even more severe than those connected with fire safety. Evidently a wooden house can be built so that modern requirements for both the airborne and the impact sound insulation are met with sufficient margins. However, low frequency impact sounds produced by walking may be audible or occupants may feel them as non audible vibrations. There is still debate over what is the proper way to rate low frequencies and which of the rating methods is most appropriate. However, what is clear is that that the ISO rating method is not sufficient where wooden floors are concerned because of the results may be subjectively wrong. On the other hand, this does not mean that the impact sounds should be rated with more than one method. Therefore existing methods shall be developed into one sole method (Fasold's method) covering all types of floors. One of the main targets in the research project was to develop an impact sound insulation model of a multi-layered floor. An EXCEL-based system was developed with which it is possible to consider the effects of different sructural parameters on the impact sound pressure levels. The comparison between measured and calculated impact sound pressure levels shows promising results. However, the model shall be surveyed and verified with a more extensive sample of floors. It seems that walking on wooden floors causes low frequency "thumps", and that these floors are poorer, in this respect, than ordinary concrete floors. Measurements in laboratory and field were carried out with the floors carpeted and with and without the the floating structure. The purpose of these tests was to study the effects of different floor sub-systems (e.g. different floating floor structures, different heights and spacings of the joists, different ceiling structures) on the imapct sound isulation. The sound insulation properties of altogether 14 different wooden floors with some modifications to them were tested. There were not very many or so great differences between the floors concerning the airborne and the impact sound insulation. However, the wood-concrete composite slab behaves clearly better than the others. Addiotinally, a floor with a thicker and stiffer board on the top of the load-bearing sub-floor seems to function well.
Original languageEnglish
Place of PublicationEspoo
PublisherVTT Technical Research Centre of Finland
Number of pages22
ISBN (Electronic)951-38-5363-2
ISBN (Print)951-38-5362-4
Publication statusPublished - 1999
MoE publication typeD4 Published development or research report or study

Publication series

SeriesVTT Publications
Number377
ISSN1235-0621

Fingerprint

insulation
acoustics
walking
ratings
sound pressure
low frequencies
floating
ceilings
research projects
margins
safety
slabs
coverings
spacing

Keywords

  • multistorey buildings
  • apartment buildings
  • wooden houses
  • wooden structures
  • sound insulation
  • floors

Cite this

Parmanen, J., Sipari, P., & Uosukainen, S. (1999). Sound insulation of multi-storey houses: Summary of impact sound insulation. Espoo: VTT Technical Research Centre of Finland. VTT Publications, No. 377
Parmanen, Juhani ; Sipari, Pekka ; Uosukainen, Seppo. / Sound insulation of multi-storey houses : Summary of impact sound insulation. Espoo : VTT Technical Research Centre of Finland, 1999. 22 p. (VTT Publications; No. 377).
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Parmanen, J, Sipari, P & Uosukainen, S 1999, Sound insulation of multi-storey houses: Summary of impact sound insulation. VTT Publications, no. 377, VTT Technical Research Centre of Finland, Espoo.

Sound insulation of multi-storey houses : Summary of impact sound insulation. / Parmanen, Juhani; Sipari, Pekka; Uosukainen, Seppo.

Espoo : VTT Technical Research Centre of Finland, 1999. 22 p. (VTT Publications; No. 377).

Research output: Book/ReportReport

TY - BOOK

T1 - Sound insulation of multi-storey houses

T2 - Summary of impact sound insulation

AU - Parmanen, Juhani

AU - Sipari, Pekka

AU - Uosukainen, Seppo

N1 - Project code: R8SU00867

PY - 1999

Y1 - 1999

N2 - Problems connected with the sound insulation of wooden multi-storey buildings are even more severe than those connected with fire safety. Evidently a wooden house can be built so that modern requirements for both the airborne and the impact sound insulation are met with sufficient margins. However, low frequency impact sounds produced by walking may be audible or occupants may feel them as non audible vibrations. There is still debate over what is the proper way to rate low frequencies and which of the rating methods is most appropriate. However, what is clear is that that the ISO rating method is not sufficient where wooden floors are concerned because of the results may be subjectively wrong. On the other hand, this does not mean that the impact sounds should be rated with more than one method. Therefore existing methods shall be developed into one sole method (Fasold's method) covering all types of floors. One of the main targets in the research project was to develop an impact sound insulation model of a multi-layered floor. An EXCEL-based system was developed with which it is possible to consider the effects of different sructural parameters on the impact sound pressure levels. The comparison between measured and calculated impact sound pressure levels shows promising results. However, the model shall be surveyed and verified with a more extensive sample of floors. It seems that walking on wooden floors causes low frequency "thumps", and that these floors are poorer, in this respect, than ordinary concrete floors. Measurements in laboratory and field were carried out with the floors carpeted and with and without the the floating structure. The purpose of these tests was to study the effects of different floor sub-systems (e.g. different floating floor structures, different heights and spacings of the joists, different ceiling structures) on the imapct sound isulation. The sound insulation properties of altogether 14 different wooden floors with some modifications to them were tested. There were not very many or so great differences between the floors concerning the airborne and the impact sound insulation. However, the wood-concrete composite slab behaves clearly better than the others. Addiotinally, a floor with a thicker and stiffer board on the top of the load-bearing sub-floor seems to function well.

AB - Problems connected with the sound insulation of wooden multi-storey buildings are even more severe than those connected with fire safety. Evidently a wooden house can be built so that modern requirements for both the airborne and the impact sound insulation are met with sufficient margins. However, low frequency impact sounds produced by walking may be audible or occupants may feel them as non audible vibrations. There is still debate over what is the proper way to rate low frequencies and which of the rating methods is most appropriate. However, what is clear is that that the ISO rating method is not sufficient where wooden floors are concerned because of the results may be subjectively wrong. On the other hand, this does not mean that the impact sounds should be rated with more than one method. Therefore existing methods shall be developed into one sole method (Fasold's method) covering all types of floors. One of the main targets in the research project was to develop an impact sound insulation model of a multi-layered floor. An EXCEL-based system was developed with which it is possible to consider the effects of different sructural parameters on the impact sound pressure levels. The comparison between measured and calculated impact sound pressure levels shows promising results. However, the model shall be surveyed and verified with a more extensive sample of floors. It seems that walking on wooden floors causes low frequency "thumps", and that these floors are poorer, in this respect, than ordinary concrete floors. Measurements in laboratory and field were carried out with the floors carpeted and with and without the the floating structure. The purpose of these tests was to study the effects of different floor sub-systems (e.g. different floating floor structures, different heights and spacings of the joists, different ceiling structures) on the imapct sound isulation. The sound insulation properties of altogether 14 different wooden floors with some modifications to them were tested. There were not very many or so great differences between the floors concerning the airborne and the impact sound insulation. However, the wood-concrete composite slab behaves clearly better than the others. Addiotinally, a floor with a thicker and stiffer board on the top of the load-bearing sub-floor seems to function well.

KW - multistorey buildings

KW - apartment buildings

KW - wooden houses

KW - wooden structures

KW - sound insulation

KW - floors

M3 - Report

SN - 951-38-5362-4

T3 - VTT Publications

BT - Sound insulation of multi-storey houses

PB - VTT Technical Research Centre of Finland

CY - Espoo

ER -

Parmanen J, Sipari P, Uosukainen S. Sound insulation of multi-storey houses: Summary of impact sound insulation. Espoo: VTT Technical Research Centre of Finland, 1999. 22 p. (VTT Publications; No. 377).