Mr. Thalheimer has performed many interior architectural acoustics projects to assess hearing conservation and comfort for employees and the suitability of performing arts venues for patron enjoyment. This type of work often includes performing spectral background noise measurements and reverberation time measurements from which most acoustical parameters can be deduced.Appropriate noise criteria are suggested and interior acoustical treatments are recommended to achieve the desired goals.
Example projects in which Mr. Thalheimer evaluated interior acoustical conditions include the following:
- NAVFAC Pharmacy Waiting Area Acoustical
Design, US Naval Facilities Engineering Command, Portsmouth, VA – Performed interior acoustical analysis for the NAVFAC Building 2 pharmacy
waiting area as part of a restoring finishes project. The goals were to (1)
ensure acoustical conditions in the waiting room will be suitable to provide
intelligible speech between pharmacists and patients at the counter windows,
and (2) ensure the pharmacists and patients speech is not easily understood by
people in the waiting area in adherence with Health Insurance Portability and
Accountability Act (HIPAA) speech privacy considerations. Used the Cadna-R model to simulate waiting
room interior noise levels due to people talking, HVAC system noise, and the
effects of the selected finish materials.
Selected a goal of STI 0.6 or better for pharmacist-patient
conversations taking place at the counter windows, and an STI 0.3 or worse for
people seated in the waiting area.
- University of New Hampshire HVAC Noise, Colden Corporation, Durham, NH
– Assisted with the assessment of HVAC noise complaints from inside a
laboratory space at UNH. Reduces sound spectra measurements to identify
potential source and recommended methods to reduce HVAC noise involving duct
- AFGA Printing Operations Noise Transfer, Colden Corporation, Andover, MA – Predicted the levels of noise that might transfer to adjacent and upper floor spaces associated with printing/plotting operations if AFGA were to sublet space in a building. Used vendor specifications to estimate the sound level produced by the printing machines and the INSUL model to estimate wall and ceiling sound transmission loss.
- Carr Residence Acoustical Guidance, Wayland, MA – Provided recommendations and guidance to homeowner while building a new residence in which sound quality was highly desired. Provided suggestions and vendor sources for wall and ceiling enhancements, HVAC sound control and speech privacy in offices.
- Wayland School of Music, Wayland, MA – Assisted with the evaluation of potential new buildings to expand the music school. Evaluated sound reduction through demising wall using INSUL model, recommended several methods to improve low frequency transmission loss between adjacent spaces.
- 6 Clarendon Street Rooftop HVAC Noise, Boston Proper Real Estate, Boston, MA – In reaction to occupant complaints, performed an assessment of interior noise levels caused by the operation of eight rooftop HVAC units of a brownstone condo building. Interior noise levels were evaluated against recommended Noise Criteria (NC), Room Criteria (RC) and A-weighted sound levels for a residential dwelling. Recommendations were provide to reduce noise intrusion from the rooftop HVAC units focusing on vibration isolation and control.
- Haley-Henry Wine Bar, The Abbey Group, Boston, MA – Hired by the building’s property manager to evaluate noise complaints in a luxury condominium located above a wine bar in the Beacon Hill area of Boston. Performed noise levels measurements inside the wine bar during its busy operations as well as in the condo above. Computed the noise reduction, STC, NC, RC and contribution of bar noise infiltrating the condo, and evaluated the results against the City of Boston Entertainment License Regulation. Recommended several source and pathway noise control options for management’s consideration.
Atlantic Avenue Soundproofing, Boston, MA – Evaluated a condominium unit for potential
soundproofing improvements due to excessive noise produced by traffic along
Atlantic Avenue and rail yard noise from MBTA South Station. The condo unit was
renovated from an old cold storage building and had concrete floors and a brick
ceiling. Recommended interior sashes to
augment existing thermal windows.
- AEW Capital Building WELL Certification, Cashins Associates, Wakefield, MA – Supported another consultant with the measurement and evaluation of interior noise levels for a new office building with respect to compliance with WELL Standard Feature 75 for interior HVAC noise. The WELL guideline required evaluation of the Noise Criteria (NC), as defined in ANSI Standard S12.2, inside various spaces within the building.
Gallery Sound Isolation, Brooklyn, NY – Supported the development of a new arts and
music gallery being built in a restored building. Provided general acoustical
guidance regarding sound quality for live entertainment, and specific analysis
using the INSUL model to recommend improved sound insulation between adjacent
Mill Condos Acoustical Gap Review, HKS Architects, Henrico, VA – Performed a
technical gap assessment and peer review for a new multi-building, multi-story
condominium complex to be built in Henrico County, VA. Architectural aspects examined included (1) exterior
walls and roof noise insulation, (2) interior walls and floor/ceiling speech
privacy, (3) mechanical equipment noise isolation, (3) HVAC noise and vibration
control, (4) plumbing systems noise control, and (5) the audibility of PA and fire
- LaGuardia Airport Air Traffic Control Tower, Skanska/Walsh JV, New York, NY – Performed a special study at the request of the Federal Aviation Administration (FAA) to assess potentially dangerous communication interruptions for air traffic controllers caused by construction near the tower. Performed an hour of simultaneous noise measurements inside and outside the control tower to establish control tower facade’s noise reduction properties. Predicted construction noise from pile driving, vac-truck excavators and hoe rams to the exterior of the tower using the Cadna-A model, and then used the measured noise reduction to predict interior noise conditions. Evaluated potential for speech interference using the Articulation Index from ANSI S3.5. Determined that both male and female control operators could maintain good speech intelligibility (i.e. AI>=0.8) speaking in a loud tone of voice. Control operators would not need to shout to be understood.
- Chicago Hancock Tower Interior Noise
Control, 175 East Delaware Place Homeowners Association, Chicago, IL
– Hired by residents association to provide guidance and recommendations to
improve intra-unit noise control and privacy of luxury condominiums in the
Chicago Hancock Tower. Provided acoustical tutorial, researched relevant
interior noise guidelines and standards, estimated STC and IIC of existing wall
and floor/ceiling construction, and developed a Building Interior Construction
Noise Specification to manage future new construction and renovation
- Residential Invasive Sound Study,
Francis/Gates Residence, Waltham, MA – Performed a residential sound study
for a hard of hearing couple to measure and evaluate low frequency music and
other noise being produced by upstairs neighbors. Collected long-term
unattended noise data and recording, had residents log time and description of
objectionable noise events, researched relevant indoor noise criteria, and
presented results showing excessive impacts of the Waltham Noise Code.
- Condominium Rooftop Ventilation Fan Noise
Control, Greater Boston Properties, Boston, MA – Performed a
noise and vibration analysis of a restaurant ventilation fan located on a
condominium rooftop at 533 Columbus Avenue. The fan was generating significant
low frequency noise inside the building and giving residents headaches and nausea.
Interior noise measurements were evaluated against recommended dBA, NC and RC
criteria, and vibration measurements on the fan and building were evaluated for
possibly causing structural damages. It was concluded that the low
frequency noise problem was due to structure-borne noise so the vibrating
rooftop fan was mitigated by relocating it onto the building’s structural
members, making better use of vibration isolator springs, installing a variable
speed drive, and most importantly, rebalancing the fan. The results
revealed a remarkable reduction virtually eliminating the interior low
frequency noise problem.
- Rooftop HVAC Units Noise and Vibration Control, Johnson Controls, Wareham and Canton, MA - Performed noise and vibration assessment for two buildings in which interior noise conditions were considered unacceptable due to the presence of multiple rooftop mounted HVAC units. Performed existing conditions noise and vibration measurements and recommended means of reducing noise and vibration via vibration isolation curbs, improved air duct positions and vanes, duct lagging enclosures, and roof enhancement. The results inside affected top floor conference rooms were evaluated using NC criteria per ANSI Standard S12.2 and RC criteria per ASHRAE guidelines.
- Windsor Locks Readiness Center, US National Guard, Windsor Locks, CT - Performed all acoustical services in support on the design of a new National Guard Readiness Center located at Bradley International Airport. Performed ambient and specific source noise measurements in order to recommended suitable exterior building facade and windows. Particularly loud noise sources to accommodate included Blackhawk (UH-60) and Chinook (CH-47) helicopters. Reviewed contractor submittals to ensure interior doors and partitions were in compliance with project specifications.
- Camp Lejeune, US Marine Corps, NC – Performed reverberation time calculations and evaluation of newly construction Applied Instruction Facility lecture/training center at Camp Lejeune, advised construction managers of acoustical criteria and required performance specifications, successfully recommended a more appropriate reverberation time requirement of 1 second in 500 Hz octave band for the lecture hall which will seat 450 marines, provided recommendations for additional acoustical absorption if space requires.
- MathWorks Campus Expansion,
Rizzo TetraTech/Spagnolo Giness & Associates, Natick, MA – Performed a
traffic noise analysis as well as an analysis of potential
mechanical/ventilation noise associated with the expansion of the MathWorks
headquarters facility in Natick, MA. The analyses focused on a controversial
open-walled parking garage. Ambient noise measurements were performed and
future noise levels were predicted using the FHWA TNM model for traffic noise,
the FHWA RCNM model for construction noise, and custom empirical/analytical
models for mechanical/ventilation noise in accordance with Mass DEP Policy
90-001 (310 CRM 7.10). The results were presented before the Natick Planning
Board. Additional work was provided to reconfirm noise compliance in the
community from the rooftop HVAC units on the building at Apple Hill 4 using the
Cadna-A model. Noise from rooftop and penthouse HVAC equipment was also
analyzed using the TAP model to ensure that upper floor conference rooms would
have acceptable interior noise conditions.
- Cloonan School Auditorium Acoustics
Evaluation, Stamford, CT – Performed reverberation time
measurements inside the auditorium of the Cloonan Middle School prior to the
auditorium being renovated. Evaluated proposed replacement acoustical
absorption materials to ensure that the renovated auditorium will have similarly
desirable acoustical conditions.
- National Guard Armory Building,
Natick, MA - Performed an interior acoustics assessment of a large
reverberant armory building (230,000 cu.ft.) which is planned to be used for
functions associated with the Town of Natick's 350th Anniversary.
Reverberation time models using Sabin's methods were developed to simulate the
space's existing acoustic properties, and options for various additional sound
absorptive treatments were evaluated. Recommendations for treatments and
costs were developed and presented to Town organizers with the goal of
achieving a more appropriate acoustic environment for the intended functions.
- Notch Welding & Contracting Noise
Survey, Chicopee, MA (1991) - Performed occupational
noise survey for MEIE insurance and employee safety purposes. Noise
measurements led to recommendations for controlling excessive metal shop-related activity noise.
- NECCO Candy Factory Reverberation Tests,
Cambridge, MA (1990) - Performed candy factory interior reverberation tests
using an automated reverberation time noise analyzer (B&K 2231) in order to
advise noise absorption treatments.
- Boston Museum of Science,
Boston, MA (1982) - Performed ambient noise study in an effort to improve
interior acoustic conditions.
- Office Building, Marlboro, MA (1982) - Performed interior octave band spectral
measurements to determine interior Noise Criteria (NC) ratings.