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1. Sound Isolation

2. HVAC Noise Control

3. Finish Treatments

Architectural Acoustics

Continuing Education Unit from the American Institute of Architects

Supported by the Acoustical Society of America

Offered by the Technical Committee on Architectural Acoustics

Author: K. Anthony Hoover, FASA CEU Administrator: Bennett Brooks, FASA


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One Continuing Education Unit From the American Institute of Architects Supported by the Acoustical Society of America

The Acoustical Society of America Technical Committee onThe Acoustical Society of America Technical Committee onArchitectural Acoustics is a Registered Provider with The AmericArchitectural Acoustics is a Registered Provider with The AmericananInstitute of Architects Continuing Education Systems. Credit eaInstitute of Architects Continuing Education Systems. Credit earnedrned

on completion of this program will be reported to CES Records foon completion of this program will be reported to CES Records forrAIA members. Certificates of Completion for nonAIA members. Certificates of Completion for non--AIA members areAIA members areavailable on request.available on request.

This program is registered with the AIA/CES for continuingThis program is registered with the AIA/CES for continuing

professional education. As such, it does not include content thprofessional education. As such, it does not include content that mayat maybe deemed or construed to be an approval or endorsement by thebe deemed or construed to be an approval or endorsement by theAIA of any material of construction or any method or manner ofAIA of any material of construction or any method or manner ofhandling, using, distributing or dealing in any material or prodhandling, using, distributing or dealing in any material or product.uct.Questions related to specific materials, methods and services wiQuestions related to specific materials, methods and services will bell be

addressed at the conclusion of this presentation.addressed at the conclusion of this presentation.

AIA/CES Best Practice


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LEARNING OBJECTIVES

This short course offers an overview of architectural acoustics,This short course offers an overview of architectural acoustics, usingusingappropriate terminology and basic examples, so that participantsappropriate terminology and basic examples, so that participants can addresscan addresscommon design and remedial issues.common design and remedial issues.

Three major components of architectural acoustics discussed hereThree major components of architectural acoustics discussed herein:in:

1.1. Sound Isolation (airborne & structureborne)Sound Isolation (airborne & structureborne)

2.2. HVAC Noise Control (Heating, Ventilating, & AirHVAC Noise Control (Heating, Ventilating, & Air--Conditioning system)Conditioning system)

3.3. Finish TreatmentsFinish Treatments (primarily sound(primarily sound--absorption in this short course)absorption in this short course)

SingleSingle--number descriptors used in architectural acoustics will be summanumber descriptors used in architectural acoustics will be summarized,rized,

including theirincluding theirmeaningsmeanings andand pitfalls. These include:pitfalls. These include:

STC, Sound Transmission Class (airborne isolation)

IIC, Impact Insulation Class (impact isolation)

NC, Noise Criteria (HVAC noise)

NRC, Noise Reduction Coefficient (absorption)

Electro-acoustic systems are not specifically addressed in this short course.


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1. Sound Isolation

Airborne & Structureborne

Airborne (through intermediate partition)

Structureborne (vibrations through solids)

Frequency-dependentIsolation generally improves with frequency.

Single-number ratings have drawbacks.

Laboratory tests:

eliminate flanking paths, by which sound bypasses the obvious partition.

provide normalized data for a specific construction.

generate information that should be adjusted for particular field conditions.


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1 Fan noise - discharge (supply)

2 Fan noise - intake (return)

3 Airflow turbulence

4 Diffuser-generated (airflow)

5 Vibration (structureborne)

6 Breakout

1

2

3

4

5

63

FAN

2. HVAC Noise Control

HVAC is Heating, Ventilating, and Air-Conditioning


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3. Finish Treatments

Types of treatment:

absorptive (summarized in this CEU)reflective (angle incidence = angle reflection)

diffusive (scatters sound)

Surface absorption scarcely affects isolation.Absorptive materials do not isolate well.

Isolating materials do not absorb well.

Expressly affect: Insignificantly affect:reverberation isolation

intelligibility noise control


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Frictional (mid and high frequencies)

Flexural (low frequencies)

Resonant (any frequency)

Three basic types of absorption

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