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23 November 2012DPCM 5/12/19971 The Italian law on building acoustics DPCM 5/12/1997 Angelo Farina Dip. di Ingegneria Industriale – Università di Parma.

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Presentation on theme: "23 November 2012DPCM 5/12/19971 The Italian law on building acoustics DPCM 5/12/1997 Angelo Farina Dip. di Ingegneria Industriale – Università di Parma."— Presentation transcript:

1 23 November 2012DPCM 5/12/19971 The Italian law on building acoustics DPCM 5/12/1997 Angelo Farina Dip. di Ingegneria Industriale – Università di Parma Parco Area delle Scienze 181/A, Parma – Italy

2 23 November 2012DPCM 5/12/19972 D.P.C.M. 5 December 1997: Titled: Specification of acoustical passive performances of buildings

3 23 November 2012DPCM 5/12/19973 D.P.C.M. 5 December 1997:

4 23 November 2012DPCM 5/12/19974 D.P.C.M. 5 December 1997:

5 23 November 2012DPCM 5/12/19975 D.P.C.M. 5 December 1997: Triv

6 23 November 2012DPCM 5/12/19976 D.P.C.M. 5 December 1997: Summary: 5 acoustical requisites for buildings: 1.Facade sound insulation 2.Apparent sound reduction index of internal partitions 3.Normalized tapping noise level 4.Maximum slow SPL of discontinuous equipment 5.Leq of equipment in continuous operation

7 23 November 2012DPCM 5/12/19977 Facade Sound Insulation

8 23 November 2012DPCM 5/12/19978 Facade Sound Insulation (2): D.P.C.M. 5/12/1997 – Annex A The Standardized Facade Sound Insulation (D 2m,nT ), is defined by: D 2m = L 1,2m – L 2 is the SPL difference L 1,2m = SPL measured 2m far from the facade, caused by traffic noise, or by a loudspeaker, with an incidence angle of 45°; L 2 = average SPL inside the receiving room; T = reverberation time inside the receiving room, in s, (ISO 3382 standard); T 0 = reference reverberation time, equal to 0.5s;

9 23 November 2012DPCM 5/12/19979 Facade Sound Insulation (3): D.P.C.M. 5/12/1997 – Alnnex A The average SPL in the receiving room, L2, is computed with this formula: L i are measurmenets performed in a number n of points. n is the integer number just above 1/10 of the rooms volume, in cubic meters. In any case, the minimum value for n is 5.

10 23 November 2012DPCM 5/12/ Facade Sound Insulation (4): D.P.C.M. 5/12/1997 – Annex A a.The ISO standard (reverberation time) was subsequently updated in 1997 and in 2008; b.The DPCM does not specify that the volume of the receiving room has to be expressed in cubic meters; c.The quantity denoted D 2m,nT is defined in UNI EN ISO as normalized facade insulation (and not standardized); d.The UNI 8270 standard, defining the single-number rating of facade insulation, has been superseded by UNI EN ISO 717/1. NOTES:

11 23 November 2012DPCM 5/12/ Facade Sound Insulation (5): Norma EN ISO 717-1:1997 Single-number rating For getting a single number giving the weighted normalized facade insulation, D 2m,nT,w, the following procedure must be followed. The ISO 717 reference spectrum must be moved down, with 1dB steps, over the measured spectrum of D 2m,nT. At each step, the sum of unfavorable deviations is computed (an unfavorable deviation occurs when the measured value, at a frequency band, is below the corresponding vale on the reference curve). When the sum of unfavorable deviations becomes smaller than 32, the reference curve is properly positioned. The weighted normalized facade insulation, D 2m,nT,w is defined as the value of the reference curve at the frequency of 500 Hz.

12 23 November 2012DPCM 5/12/ Facade Sound Insulation (6):

13 23 November 2012DPCM 5/12/ Sound insulation of internal partitions Attention! Only partitions between two different properties are subjected to the law!

14 23 November 2012DPCM 5/12/ D.P.C.M. 5/12/1997 – Allegato A a.The apparent sound reduction index R is defined by the EN ISO 140-4:2000 (and NOT by EN ISO 140-5:1996, as incorrectly written in the DPCM). b.The UNI 8270 standard, defining the single-number rating of facade insulation, has been superseded by UNI EN ISO 717/1. NOTES: Sound insulation of internal partitions (2): Sound insulation of internal partitions (2):

15 23 November 2012DPCM 5/12/ EN ISO 140-4:2000 standard Sound insulation of internal partitions (3): Sound Insulation, D: Diffrence, in dB, between the spatially and temporally averaged values of the SPL in the two rooms: The apparent sound reduction index, R is given by: where: D is the Sound Insulation; S is the area of the wall separating the two rooms; A is the equivalent absorption area of the receiving room. L 1 is the average SPL in the transmitting room; L 2 is the average SPL in the receiving room.

16 23 November 2012DPCM 5/12/ EN ISO 140-4:2000 standard The equivalent absorption area of the receiving room, A, is computed as: where: V is the volume of the receiving room, in cubic meters; T is the reverberation time measured inside the receiving room. Tapping Noise (4):

17 23 November 2012DPCM 5/12/ Sound insulation of internal partitions (5):

18 23 November 2012DPCM 5/12/ Tapping Noise

19 23 November 2012DPCM 5/12/ D.P.C.M. 5/12/1997 – Annex A a.The normalized tapping noise level (Ln), is defined by the UNI EN ISO 140-7:2000 stndard, instead of EN ISO 140-6:1996, as written in the DPCM. The latter is for laboratory measurments, whilst the DPCM is referring to in situ measurments. b.The UNI 8270 standard, defining the single-number rating of normalized tapping noise level, has been superseded by UNI EN ISO 717/2. NOTES: Tapping Noise (2):

20 23 November 2012DPCM 5/12/ UNI EN ISO 140-7:2000 standard Average tapping noise level, Li: is the average SPL measured inside the receiving room when the standardized tapping machine is operating inside the adjacent room. Normalized tapping noise level, L n : it is the average tapping noise level corrected by a term taking into account the equivalent absorption area of the receiving room, with reference to a standard absoprtion area A 0 : where: A 0 = 10 m 2. Tapping Noise (3):

21 23 November 2012DPCM 5/12/ UNI EN ISO 140-7:2000 standard The equivalent absorption area of the receiving room, A, is computed as: where: V is the volume of the receiving room, in cubic meters; T is the reverberation time measured inside the receiving room. Tapping Noise (4):

22 23 November 2012DPCM 5/12/ Tapping Noise (5):

23 23 November 2012DPCM 5/12/ HVAC and plumbing noise The measurement is to be performed inside a different room (of a different owner) than the one where the equipment is operating An explanation form the Ministry clarifies that the limit values are those reported in table B. The general limits of 35 e 25 dB(A) contained in the descriptive part of the DPCM are just a lapsus calami and are valueless. The noise produced by common (condominial) equipment are NOT subjected to the differential limits given by DPCM 14/11/1997Determinazione dei valori limite delle sorgenti sonore

24 23 November 2012DPCM 5/12/ Tricks (facade insulation): Interrupted gasket:

25 23 November 2012DPCM 5/12/ Tricks (facade insulation): Continuous gasket:

26 23 November 2012DPCM 5/12/ Tricks (facade insulation): Bad sealing around the frame of the window:D2m,nT,w = 37 dB

27 23 November 2012DPCM 5/12/ Tricks (facade insulation): Good sealing around the frame of the window:D2m,nT,w = 41dB

28 23 November 2012DPCM 5/12/ Psychoacoustic effect Complaints for low insulation (Rw = 45 dB) After rebuilding the partition: Rw = 53 dB, But the residents still complain….


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