A parametric study of the acoustic properties of thermal cladding systems

Churchill, Claire; Bednar, Thomas; Müllner, Herbert W.; Neusser, Maximilian; Hinterseer, S.

doi:10.1016/j.apacoust.2020.107656

“…Some basic material properties of the weatherproof layer, such as thickness and density, are also required. A previous calculation procedure [34] is revised to align the input parameters that contribute to the calculated sound insulation improvement at high and low frequencies, i.e. to give a single resonance frequency that describes both the spring-mass resonance behaviour and the structure-borne transmission through the combined thermal interlayer and wall mounting system.…”

Section: Methodsmentioning

confidence: 99%

“…The latter may increase the measured sound insulation in the laboratory, where flanking transmission is excluded from the receiving room, and this energy is then lost to the laboratory construction. The effect of these conditions is assessed in sections 7.2 and 7.3; they may in part contribute to the unexpectedly high influence of the base wall construction on the sound insulation improvement of thermal insulation systems observed in laboratory measurements [34]. Finally, the standard error of the inputs is discussed in section 7.4 and the conclusions are presented in section 8.…”

Section: Methodsmentioning

confidence: 99%

“…Sound insulation improvement differs in the cases of airborne transmission and flanking transmission, and it may also differ in the case of a heavyweight or lightweight base wall. In all cases, it is possible to measure the frequency range 50 Hz-5000 Hz, using the methodology described in EN ISO 10140-1 ANNEX G [33]; however, the capacity to predict (or, indeed, to apply measured results to a different type of construction [34]) is less certain. The prediction standard endeavours to provide a simple methodology to predict the single figure weighted sound insulation improvement (ΔR W ) of an additional layer, and the recognition that different system "types" will give different single figure values is already part of EN12354.…”

mentioning

confidence: 99%

“…This has increased the relative importance of characterising the structure-borne transmission through the connections or mounting system. Systems with a similar f 0 are experimentally shown to give very different single-figure values [34] (e.g. using different materials for the weatherproof covering).…”

mentioning

confidence: 99%

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Retrofit and design of thermal cladding systems provide an opportunity to improve the acoustic properties of a building. However, the complexity of the calculation process to predict sound insulation improvement may inhibit rather than encourage novelty and innovation. This paper investigates whether it is realistic to calculate the frequency dependant sound insulation improvement due to modern thermal insulation wall lining systems with just a few input parameters. The calculation procedure is tested using measured results for one external thermal insulation composite system (ETICS) and three curtain wall systems. The accuracy of the procedure is examined using three factors: (1) precision of the measurement, (2) variation of some of the basic parameters of the calculation procedure, and (3) an estimation of the standard error of the calculation. For the ETICS, agreement within <6.0 dB is achieved across much of the frequency range and the trend of the extended dip due to the spring-mass action of the panel is corroborated. The case for using this methodology on curtain wall systems is adequate, however, the trend of calculated results is mostly outside of the 95% confidence limits of the measured results. Possible reasons for this include lack of airtightness of all curtain wall systems and additional transmission due to radiation into and out of the cavity, neither of which are included in the model. The assumption of radiating points or lines, rather than a radiating surface involving the whole panel, gave better agreement at high frequencies for three of the four measured systems (f ≥ 2500 Hz).

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Retrofit and design of thermal cladding systems provide an opportunity to improve the acoustic properties of a building. However, the complexity of the calculation process to predict sound insulation improvement may inhibit rather than encourage novelty and innovation. This paper investigates whether it is realistic to calculate the frequency dependant sound insulation improvement due to modern thermal insulation wall lining systems with just a few input parameters. The calculation procedure is tested using measured results for one external thermal insulation composite system (ETICS) and three curtain wall systems. The accuracy of the procedure is examined using three factors: (1) precision of the measurement, (2) variation of some of the basic parameters of the calculation procedure, and (3) an estimation of the standard error of the calculation. For the ETICS, agreement within <6.0 dB is achieved across much of the frequency range and the trend of the extended dip due to the spring-mass action of the panel is corroborated. The case for using this methodology on curtain wall systems is adequate, however, the trend of calculated results is mostly outside of the 95% confidence limits of the measured results. Possible reasons for this include lack of airtightness of all curtain wall systems and additional transmission due to radiation into and out of the cavity, neither of which are included in the model. The assumption of radiating points or lines, rather than a radiating surface involving the whole panel, gave better agreement at high frequencies for three of the four measured systems (f ≥ 2500 Hz).

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A parametric study of the acoustic properties of thermal cladding systems

Cited by 5 publications

References 7 publications

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