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The Italian law on building acoustics DPCM 5/12/1997

Dip. di Ingegneria Industriale – Università di Parma Parco Area delle Scienze 181/A, 43100 Parma – Italy farina@aidasrl.it. The Italian law on building acoustics DPCM 5/12/1997. Angelo Farina. D.P.C.M. 5 December 1997:. Titled:

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The Italian law on building acoustics DPCM 5/12/1997

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  1. Dip. di Ingegneria Industriale – Università di Parma Parco Area delle Scienze 181/A, 43100 Parma – Italy farina@aidasrl.it The Italian law on building acousticsDPCM 5/12/1997 Angelo Farina DPCM 5/12/1997

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

  3. D.P.C.M. 5 December 1997: DPCM 5/12/1997

  4. D.P.C.M. 5 December 1997: DPCM 5/12/1997

  5. Triv D.P.C.M. 5 December 1997: DPCM 5/12/1997

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

  7. Facade Sound Insulation DPCM 5/12/1997

  8. Facade Sound Insulation (2): D.P.C.M. 5/12/1997 – Annex A The Standardized Facade Sound Insulation (D2m,nT), is defined by: D2m = L1,2m – L2 is the SPL difference L1,2m = SPL measured 2m far from the facade, caused by traffic noise, or by a loudspeaker, with an incidence angle of 45°; L2 = average SPL inside the receiving room; T = reverberation time inside the receiving room, in s, (ISO 3382 standard); T0 = reference reverberation time, equal to 0.5s; DPCM 5/12/1997

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

  10. FacadeSound Insulation (4): D.P.C.M. 5/12/1997 – Annex A NOTES: • The ISO 3382-1975 standard (reverberation time) was subsequently updated in 1997 and in 2008; • The DPCM does not specify that the volume of the receiving room has to be expressed in cubic meters; • The quantity denoted D2m,nT is defined in UNI EN ISO 140-5 as normalized facade insulation (and not “standardized”); • The UNI 8270 standard, defining the single-number rating of facade insulation, has been superseded by UNI EN ISO 717/1. DPCM 5/12/1997

  11. FacadeSound Insulation (5): Norma EN ISO 717-1:1997 Single-number rating For getting a single number giving the weighted normalized facade insulation, D2m,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 D2m,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, D2m,nT,w is defined as the value of the reference curve at the frequency of 500 Hz. DPCM 5/12/1997

  12. FacadeSound Insulation (6): DPCM 5/12/1997

  13. Sound insulation of internal partitions Attention! Onlypartitionsbetweentwodifferentproperties are subjected to the law! DPCM 5/12/1997

  14. Sound insulation of internal partitions (2): D.P.C.M. 5/12/1997 – Allegato A NOTES: • 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). • The UNI 8270 standard, defining the single-number rating of facade insulation, has been superseded by UNI EN ISO 717/1. DPCM 5/12/1997

  15. Sound insulation of internal partitions (3): EN ISO 140-4:2000 standard Sound Insulation, D: Diffrence, in dB, between the spatially and temporallyaveragedvalues of the SPL in the two rooms: L1is the average SPL in the transmitting room; L2is the average SPL in the receiving room. The apparent sound reduction index, R’is given by: where: D is the Sound Insulation; Sis the area of the wallseparating the two rooms; A is the equivalentabsorption area of the receiving room. DPCM 5/12/1997

  16. TappingNoise(4): EN ISO 140-4:2000 standard The equivalentabsorption area of the receiving room, A,iscomputedas: where: V is the volume of the receiving room, in cubicmeters; T is the reverberation time measured inside the receiving room. DPCM 5/12/1997

  17. Sound insulation of internal partitions (5): DPCM 5/12/1997

  18. TappingNoise DPCM 5/12/1997

  19. TappingNoise(2): D.P.C.M. 5/12/1997 – Annex A NOTES: • The normalized tapping noise level (L’n), 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. • The UNI 8270 standard, defining the single-number rating of normalized tapping noise level, has been superseded by UNI EN ISO 717/2. DPCM 5/12/1997

  20. TappingNoise(3): 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 A0: where: A0 = 10 m2. DPCM 5/12/1997

  21. TappingNoise(4): UNI EN ISO 140-7:2000 standard The equivalentabsorption area of the receiving room, A,iscomputedas: where: V is the volume of the receiving room, in cubicmeters; T is the reverberation time measured inside the receiving room. DPCM 5/12/1997

  22. TappingNoise(5): DPCM 5/12/1997

  23. HVAC and plumbingnoise • 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 14/11/1997 “Determinazione dei valori limite delle sorgenti sonore” DPCM 5/12/1997

  24. Tricks (facadeinsulation): Interruptedgasket: DPCM 5/12/1997

  25. Tricks (facade insulation): Continuousgasket: DPCM 5/12/1997

  26. Tricks (facadeinsulation): Badsealingaround the frame of the window: D2m,nT,w = 37 dB DPCM 5/12/1997

  27. Tricks (facadeinsulation): Goodsealingaround the frame of the window: D2m,nT,w = 41dB DPCM 5/12/1997

  28. Psychoacousticeffect Complaints for low insulation (R’w = 45 dB) After rebuilding the partition: R’w = 53 dB, But the residents still complain…. DPCM 5/12/1997

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