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Urban Acoustics
Disclaimer: This presentation was developed by a third party and is not funded by WoodWorks or the Softwood Lumber Board.
Steve(n) Thorburn, PE, LEED AP, CTS-I, CTS-D [email protected], TECHNOLOGY, AND LIGHTING DESIGNHORBURN ASSOCIATES
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“The Wood Products Council” is a Registered Provider with The American Institute of Architects Continuing Education Systems (AIA/CES), Provider #G516.
Credit(s) earned on completion of this course will be reported to AIA CES for AIA members. Certificates of Completion for both AIA members and non-AIA members are available upon request.
This course is registered with AIA CESfor continuing professional education. As such, it does not include content that may be deemed or construed to be an approval or endorsement by the AIA of any material of construction or any method or manner of handling, using, distributing, or dealing in any material or product.
______________________________
Questions related to specific materials, methods, and services will be addressed at the conclusion of this presentation.
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As with any issue of building performance, the acoustics of a mixed-use wood-frame
structure can be designed to meet or far exceed minimal requirements. It is the
responsibility of the design team to determine acoustical expectations for the project and
meet them within the available budget.
Through the use of case studies, this fast-paced, interactive session will explore how multi-
story wood systems can be used to meet acoustical privacy goals. Discussion will focus on
the detailing and construction of units, and how consideration of the construction process
can help keep acoustical costs down.
With the objective of providing implementable solutions, the session will include
construction details and photos showing what has and hasn’t worked in actual buildings.
Steve(n) Thorburn, PE, LEED AP, CTS-I, CTS-D, Thorburn [email protected]
Urban Acoustics – Course Description
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At the end of this program, participants will be able to:
- Evaluate the acoustical impact of ICC Building Code vs. Residential Expectations
- Develop cost effective / acoustically centric space planning ideas for wood frame design
- Produce practical and constructible acoustical isolation detailing for wood frame design
- Identify common acoustical compromises during construction
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Copyright Materials
This presentation is protected by US and International Copyright laws. Reproduction, distribution, display and use of the presentation without written permission of the speaker is
prohibited.
© Thorburn Associates Inc.
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Mixed Use
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Urban AcousticsThe Building Code
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Our Goal Control the Transfer of Noise!
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Slide 16
Acoustical Expectations
Luxury? Market Rate? Entry Level?
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Entry Level HousingSTC 50 / IIC 50 (STC /IIC 48)*
Market Rate HousingSTC 55 / IIC 55 (STC/IIC 52)*
Luxury Rate HousingSTC 60+ / IIC 60+ (STC/IIC 55)*
IIC 60+ very hard to achieve with wood or tile surfaces
* Actual 1962 values – adjust when IBC set “50” as minimum
FHA Rules of Thumb from 1962NOTE THIS IS NOT A CODE, IT HAS BECOME the DE FACTO STANDARD BUT NOT CODE
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ICC G2 2010 Guideline for Acoustics
Acceptable Performance“Grade B Performance”
55 / 52(Laboratory / Field)
Airborne - STC / NNICImpact - IIC / NISR
Preferred Performance“Grade A Performance”
60 / 57 (Laboratory / Field)
Airborne - STC / NNICImpact - IIC / NISR
STILL NOT A CODE, IT IS FROM THE ICC –FROM WHAT APPEARS TO BE A RESEARCH PAPER FROM THE INTERNET!
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Exterior to Interior
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Land Use Compatibility For Community Noise
Exterior Day/Night Noise Levels (Ldn, dBA)Land Use Category
Single Family
Multi Family
Motel, Hotels
Outside Use
55 60 65 70 75 80
NormallyAcceptable
ConditionallyAcceptable
NormallyUnacceptable
ClearlyUnacceptable
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Mixed Use – Bar to Housing
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Not Addressed by Building Code- Implied at 45 dBA /Ldn
(Interior Noise Criterion)- Enforced as Nuisance Complaints- Enforced by “Local Codes”
THIS IS CHANGING – THE IgCC IS PLACING LIMITS ON
COMMERCIAL TO RESIDENTIAL
Commercial to Residential
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Urban Acoustics Vocabulary
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Terms (They Are Changing!)
SoundSTCFSTC NIC
ASTCNNIC
ImpactIIC
FIICAIICNISR
GeneralNRdBALdn
CNELOITC
NC NRC
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Urban Acoustics - Vocabulary
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Acoustical Test Laboratory
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Acoustical Test Chamber
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STC vs ASTC (NIC, FSTC)
STC Testing ASTC Testing
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IIC vs AIIC (FIIC)
IIC Testing AIIC Testing
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How STC or IIC Rating Is Found
7 8 10 9 86 4 3
3
2
GOAL STC 50
MEASURED
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How STC or IIC Rating Is Found
6 7 9 8 75 3 2
2
1
NOW STC 49
MEASURED
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How STC or IIC Rating Is Found
5 6 8 7 64 2 1
1
NOW STC 48
MEASURED
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How STC or IIC Rating Is Found
4 5 7 6 5 3 1
NOW STC 47
MEASURED
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Acoustical Detailing is Systems
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Urban Acoustics Acoustical
Wall Systems
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Acoustical Detailing – The Givens• Walls are Full Height
(Deck to Deck)• Insulated (Unfaced Batt)
In all Stud or Joist Cavities• Sealed Air Tight• Floor Sheeting
Is Glued and Screwed
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Wall Progression – Sound Isolation
STC 34 STC 38 STC 45
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Wall Progression – Sound Isolation
STC 50 STC 63 STC 49
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Metal Channels
Hat ChannelsAre Not
Acoustical Channels
Resilient ChannelsAre
Acoustical Channels
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Slide 40
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Hat Channel Resilient Isolators
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Hat Channel Resilient Isolators
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Lot Line Wall – Sound Isolation
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Urban AcousticsAcoustical
Floor / Ceiling SystemsSound and Impact
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Floor Systems
STC 37
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Floor Systems
STC 43
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Floor Systems
STC 49
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Floor Systems – Topping Slab
Gypcreteor
Light Weigh Concrete
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Floor Systems
STC 56
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Floor Systems
STC 62
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Floor Systems
Batt insulation not show for clarity
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Floor Systems
Batt insulation not show for clarity
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Floor Systems
Batt insulation not show for clarity
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Floor Systems
Batt insulation not show for clarity
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Independently Framed Ceiling System
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Impact Noise
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The Tapper
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The Tapper
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Impact Isolation
• Impact noise changes as it travels in the building.• Impact noise is best controlled at the source.
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Effects of Floor Covering on Impact Isolation
Batt insulation not show for clarity
IIC 73 IIC 64 IIC 56 IIC 43 IIC 32
STC 56
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Cross-Laminated Timber
70+
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Cross-Laminated Timber
70+
ACOUSTICALLY STILL REALLY NEW
We Need More Test Data
In absence of test data we compare to known acoustical systems
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Cross-Laminated Timber
"Volume generally assumed for the density of hardened concrete is
150 lb./ft3. (2400 kg/m3)“
McGraw-Hill Encyclopedia of Science and
Technology.
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Cross-Laminated Timber
6 inch thick 20 lb./ft3. CLTSame Mass as
1.6 inch thick Concrete
Based on AcousticsMass Law STC Rating
about 38 STC
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Cross-Laminated Timber
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Cross-Laminated Timber
70+ IIC 35
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Urban Acoustics Leaks - Doors and Windows
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Slide 68
Leaks: Where air can flow... ...so will sound.
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Air Tight Seal
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Batt Insulation
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Blow In Insulation
OPEN CELL FOAMCLOSED CELL FOAMCELLULOUS / FIBER
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Rigid “Foam” Insulation
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Urban Acoustics Other Issues to Consider
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Acoustical Fiction!• Fiber Board
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Acoustical Fiction!• Trapped Channel
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Trapped Air Space and Screws
STC 55
STC 38
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Installation Issues - RC
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Plumbing Isolation
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Other Noise Issues
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Condominium Noise
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Now We See the Problem
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Installation Issues - RC
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Installation Issues - RC
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Slide 84
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Slide 85
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Sprinkler Lines / Heads
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RESILIENT CEILING SYSTEMS
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Duct Work
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HOLES IN SYSTEMS
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Recessed Light Fixtures
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RESILIENT CHANNELS INSTALLATION
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Framing Issues
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Framing Issues … (ok Plumbing)
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ACOUSTICAL GYPSUM BOARD
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DAMPING
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OMG!
THIS IS VERYBAD! DO NOTBELIEVE THE INTERNET!
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OMG!
THIS IS VERYBAD! DO NOTBELIEVE THE INTERNET!
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OMG!
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When it comes to AcousticsOnly Believe Real Laboratory
Test Data or Someone you Pay and can Sue!
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This concludes The American Institute of Architects Continuing Education Systems Course
QUESTIONS?
Steve(n) Thorburn, PE, LEED AP
Thorburn Associates Inc.
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