Wood and Acoustics. The Acoustical Impact of Mixed Use Projects on Multi-Family Housing. Has Your Firm Been Sued Yet!

Transcription

1 Wood and Acoustics The Acoustical Impact of Mixed Use Projects on Multi-Family Housing or Has Your Firm Been Sued Yet! Presented by: Thorburn Associates Inc. Steven J. Thorburn, PE, LEED-AP Corporate Office: Regional Office: Regional Office: Castro Valley, California Burbank, California Morrisville, North Carolina Tel: Tel: Tel:

2 Slide 31 Mixed Use / Multi-family Housing Outside use criteria Inside use criteria Unit to unit criteria Walls /Floor ceilings Plumbing noise Commercial to Housing Lot Line Noise from building sources Slide 32 ACOUSTICAL CODES Slide 33

3 Entry Level Acoustical Codes? Slide 34 How about Market Rate Code? Slide 35 So What Is The Luxury Code Slide 36

4 Slide 37 IBC Weaker than UBC Requires STC 50 / IIC 50 design or FSTC 45 / FIIC 45 in situ. This is IT! just Code Compliant! Nothing on quality of life. UBC also required 45 Ldn inside Slide 38 HUD Rules of Thumb from 1962 Code Compliant.. Lowest level STC 50 / IIC 50 Market Rate Housing STC 55 / IIC 55 Luxury Rate Housing STC 60+ / IIC IIC 60+ very hard with wood or tile Slide 39

5 Slide 40 So why does it all matter? Slide 41 Slide 42

6 Slide 43 Slide 44 Oakland Noise Element Table : MAXIMUM ALLOWABLE RECEIVING NOISE LEVEL STANDARDS, dba Residential and Civic Cumulative Number of Minutes in Either the Daytime or Nighttime One Hour Time Period Slide 45 Minutes in an Hour Daytime 7 am 10 pm Night time 10 pm 7 am dba

7 Foster City Noise Element The noise environment in existing residential areas is required to be protected. The City will require mitigation measures for projects that would cause the Ldn to increase by 3 dba or more where noise levels would exceed or currently exceed 60 dba Ldn. Slide 46 Foster City Cont. Slide 47 Table V. H-3: Noise and Land Use Compatibility Standards for Industrial and Commercial Noise Sources Minutes in an Hour Daytime 7 am 10 pm Night time 10 pm 7 am dba City Of Irvine Noise Element Table F-1: Interior and Exterior Noise Standards Energy Average (CNEL) For Residential Land Use Uses Interior (CNEL) Exterior (CNEL) Single- Family 45 (55) 1 65 Multiple- Family Mobile Home Noise requirement with window open if they are used to meet natural ventilation requirement! Slide 48

8 Slide 49 Slide 50 Leq The equivalent steady-state A-weighted sound level that, in a stated period of time, would contain the same acoustic energy as the time-varying sound level during the same time period. Slide 51

9 15 MINUTE NOISE MEASUREMENTS INSIDE SENIOR HOUSING ROOM A-WEIGHTED SOUND PRESSURE LEVEL db SPL Slide 52 Ldn Day/Night Sound Level (Ldn). A descriptor established by the Environmental Protection Agency for the 24-hour average A-weighted noise level. Sound levels during the hours from 10:00 pm to 7:00 am, hours which people are more sensitive to noise, are penalized 10 decibels (db). A 10 db increase in sound level is perceived by people to be twice as loud. Slide 53 CNEL Community noise equivalent level A descriptor for the 24-hour a-weighted average noise level. Accounts for the increased acoustical sensitivity of people to noise during the evening and nighttime hours. Sound levels during the hours from 7:00 pm To 10:00 pm, are penalized 5 db; Sound levels during the hours from 10:00 pm To 7:00 am, are penalized 10 db. Slide 54

10 Slide 55 Slide 56 Composite TL of Exterior Wall Slide 57 Wall TL = 10 Log 1 τ 45 = 10 Log τ = Log τ 1 = 10 τ 4.5 τ = Window TL = 10 Log STC Wood could Works: Beyond be Aesthetics: substituted Acoustics for TL 1 τ 20 = 10 Log τ 1 20 = Log 1 τ 1 τ = 10 2 τ = 10-2

11 Composite TL of Exterior Wall ΣS Composite TL = 10 Log ( ) = 10 Log 100 ( x x 40) ΣτS = 10 Log 100 ( * *40 ) = 10 Log (249) = 10 x 2.4 = 24 db Slide 58 Sound and Impact Isolation Walls Doors Floors and Ceilings Windows Slide 59 STC NR FSTC TL IIC FIIC EIEIO Slide 60

12 Sound Isolation Sound is blocked by partitions with mass. Sound can be blocked by two light weight partitions separated by a large air space. Slide 61 Sound Impinging on a Structure I i I a I t I r Slide 62 STC 50/55 Wall Detail Slide 63

13 STC?? Wall Slide 64 Sound Isolation A chain is only as strong as its weakest link. Slide 65 Transmission Loss db ALL BRICK - COMPOSITE TL 50 db 100 db 50 db Slide 66

14 Transmission Loss db 1/4 GLASS - COMPOSITE TL 26 db 100 db 74 db Slide 67 Transmission Loss db ALL GLASS - COMPOSITE TL 20 db 100 db 80 db Slide 68 Leaks Slide 69

15 Leaks Where air can flow......so Wood Works: will Beyond sound. Aesthetics: Acoustics Slide 70 Effects of Leaks Transmission Loss With Leak (db) Transmission Loss Without Leak (db) Sound Leak (% of total surface area) Slide 71 Outlet Gypsum Board Seal Airtight Outlet Box Pad Junction Box Batt Insulation Slide 72

16 Outlet Slide 73 Outlet and Blocking Slide 74 Acoustical Doors and Windows Slide 75

17 Jamb and Head Acoustical Doors Solid Core Wood Door Floor Slide 76 Acoustical Windows Slide 77 Slide 78

18 Slide 79 Slide 80 Slide 81

19 Slide 82 Slide 83 Slide 84

20 Slide 85 Slide 86 Slide 87

21 Slide 88 Slide 89 Slide 90

22 Slide 91 Impact Isolation Impact noise changes in materials. Impact noise is best controlled at the source. Slide 92 Impact Noise Paths Slide 93

23 Impact Isolation Slide 94 Tapping Machine Slide 95 Impact Isolation Class IIC or Impact Isolation Class A single figure rating which quantifies the property of a floor/ceiling construction to reduce footfall-generated noise. Increasing IIC values correspond to improved impact insulation. Slide 96

24 Impact Isolation Class 6 Slab with Sheet Vinyl with Carpet 2 x 10 with Light-weight, Insulation, and Gypsum Board on Resilient Channels : with Sheet Vinyl with Carpet 35 IIC 70 IIC 47 IIC 70 IIC Slide 97 Topping Slab Slide 98 Plumbing Noise Slide 99

25 Mixing Valve Noise Slide 100 Large Pipe Plumbing Isolation Slide 101 PEX Spaghetti Slide 102

26 Priceless: 4.5 inch Pipe System in 3.5 inch stud Cavity! What Part of Don t Do This! Did They Not Understand! Slide 103 Plumbing Isolation (Foam) Slide 104 Water Hammer Noise Slide 105

27 Environmental Noise Control Outside criteria by local municipality Distance to the noise source Barrier or noise control options Slide 106 Vibration Isolation Slide 107 Vibration Isolation Slide 108

28 Electrical Isolation Slide 109 What Part of Don t Do This Did They Not Understand? Slide 110 Mechanical System Noise Slide 111

29 Wood Noise Barriers aka lot line fences! Slide 112 Finishes Slide 113 Finishes Slide 114

30 The Party Goes On Slide 115 Questions??? This concludes The American Institute of Architects Continuing Education Systems Program Slide 116 The Acoustical Impact of Mixed Use Projects on Multi-Family Housing Presented By: Thorburn Associates, Inc ACOUSTIC AND TECHNOLOGY CONSULTANTS Designing Quality Environments Slide 117