Case Study – Naples Flatbread

commercial acoustics absorption panels naples flatbread

Naples Flatbread, a modern restaurant serving up artisanal flatbreads, recently discovered they were suffering from a sound problem. In addition to their restaurant services, the trendy location is equipped with a stage and offers live music to guests as they dine. Nearly all restaurants experience some type of soundproofing or acoustics problem, and hosting live music only adds to the need for expert sound treatment. Naples Flatbread found their sound solution with Commercial Acoustics.

Commercial Acoustics sent their acoustic experts to consult with the owners of Naples Flatbread. A clear height of 30′ combined with the number of sealed surfaces that restaurants require was causing something of an acoustic nightmare for the restaurant. The technicians analyzed the restaurant, considered its layout, and calculated the exact amount of absorption necessary for the space

Our acoustic experts determined that 75 acoustic panels would considerably improve the acoustics in the restaurant, effectively solving their sound problem. Commercial Acoustics manufactured all 75 panels, each measuring 2x4x2″. The experts then developed the ideal layout for the panels, installing 50 to the restaurant’s walls and the remaining 25 to its ceiling.

Commercial Acoustics was able to fully remedy the acoustic problem Naples Flatbread was experiencing. The restaurant is now the ideal location for guests to enjoy both their flatbreads and their live music events, without the burden of a noise problem.

Hotel Soundproofing – Hyatt Clearwater

Commercial Acoustics Hyatt Condo Soundproofing

The Hyatt Condo in Clearwater, Florida needed help soundproofing their ceiling on the penthouse floor. Directly above, dozens of patrons used the rooftop bar at night and during the weekends. While the penthouse suite affords the best views in the hotel, it is also the closest to the nightlife noise, and therefore often in need of additional soundproofing.

As we’ve discussed in the past, there is little regulation in STC and IIC ratings for soundproofing hotels. However, most of them have a brand standard that ranges from 55-60 points, and can be above 60 for luxury suites. By setting aggressive STCs and monitoring proper installation techniques, hotel management can expect to reduce customer noise complaints considerably.

The Hyatt Clearwater ceiling used a double-rack design with soffits to hide unsightly pipes and electrical, but this did not improve the sound attenuation rating of the assembly. Furthermore, treating the floor above was not an option, since the deck was already and completed, and beyond the waterproof limit of the hotel.

In order to achieve acceptable sound ratings, the client turned to Commercial Acoustics to provide soundproofing membranes that could be installed on the ceiling above. By implementing a heavy-duty soundproofing membrane along the ceiling, known as the Wall Blokker PRO, the team was able to provide significant decoupling of the ceiling while also adding additional mass to reduce airborne transmission. Ultimately, soundproofing installation on ceilings is the most difficult, and took a team of four almost one week to cover the nearly five thousand square feet. For best results, Commercial Acoustics recommends applying ceiling-bound membranes to the backside of drywall to expedite installation.

Commercial Acoustics Hotel Soundproofing Ceiling

Check here for more hotel and hospitality soundproofing case studies.

Restaurant Acoustics – Sarasota, Florida

restaurant acoustics commercial acoustics speaks

Determining the Restaurant Acoustics

Speaks Clam Bar in Sarasota, Florida opened 2 months ago, and with the high-end marble finish and tile floor, noted that they were experiencing sound issues. Specifically, they had excessive reverberation in their restaurant that made it difficult for patrons to converse easily. Losing what we call “Speech Intelligibility“.

This is a very common issue Restaurants and other entertainment venues encounter when they have many flat, reflective surfaces and large, open spaces.

By performing a basic reverberation assessment, and modeling, it’s easy to determine the exact issue in the space.

Acoustic Treatment for the Restaurant

After performing an initial site visit, Commercial Acoustics manufactured and installed custom acoustic panels per the client’s needs, and the reverberation time in the space decreased from 1.6 seconds to below 1 second. This is an ideal reverb time for restaurants that are looking for a lively, but intimate setting.

Sofwerx – Tampa Bay, FL

commercial acoustics sofwerx absorption

Sofwerx was a Joint Venture between the Department of Defense and a local non-profit known as the Doolittle Institute. The focus is to develop a training and strategy group that could provide counter-UAV support for our troops.

The team was faced with an extremely aggressive task of converting an old, 33,000 square foot warehouse into an operational site in less than two months. While the architect and design team was busy planning layouts and aesthetics, they realized that there was one challenging element that had not yet been considered: acoustics!

The site had a number of unique elements:

  1. A large auditorium where drones and UAVs (Unmanned Aerial Vehicles) would fly and pilots practice. This was to be converted from the previous “sanctuary” – a large, open space that already suffered from substandard reverberation. To make matters worse, the team needed to remove all of the plush furniture which was helping absorb some of the current echo.
  2. An open office area where pilots, technicians, operators, and management could meet to discuss new counter-drone tactics. None of the office walls went to deck, and most of them did not even have ACT tiles. Furthermore, 90% of the staff were to work collaboratively on large tables out in the open “bullpen”.
  3. A machine shop was directly adjacent to a presentation room. While the machine shop was necessary to quickly manufacture replacement parts, it was to be used simultaneously to the rest of the space. With grinding and milling operations around 110dB, this threatened to make it very difficult to hold meetings immediately next door.

Ultimately, Sofwerx reached out to Commercial Acoustics to provide support in all 3 areas.

  1. Absorption panels were manufactured in-house and delivered to the site within weeks. Commercial Acoustics determined the amount of panels necessary for each space and designed the panel layout for optimal effectiveness.  Furthermore, the design team loved the concept of acoustic “teepees” or wings, hanging over 6-person desk spaces. These were uniquely designed, built, delivered, and installed within 30 days.
  2. A sound-masking system was installed and tuned in the main open office area to provide additional speech privacy. Where none of the office walls went to deck or had ACT, the masking system was the only sound solution that would be effective in that space; raising the background dB level and preventing confidential conversations from bleeding into the adjacent spaces.
  3. Finally, soundproofing membrane material was used in the machine shop, to attenuate unwanted noise prior to it reaching the presentation area. We also recommended that the high-NC machinery was moved to the exterior walls and a high-STC solid core door was installed, to avoid an untreated flanking path.

For these varying sound issues, none have a blanket solution and each environment and sound concern needs to be analyzed in order to find the appropriate solution. Our team was on hand to collaborate with the architects, interior designers and clients to ensure that the sound quality, code compliance, aesthetics, and time frame were met. By implementing a holistic approach, the client received great results, and on an extremely tight timeline.

If you found anything in common in this case study with your projects, let us know here and one of our acoustical specialists will reach out to you shortly.

MidFlorida Credit Union Call Center – Case Study

call center sound masking acoustics

MidFlorida Credit Union employees found themselves struggling with voice carryover in their headquarters’ call center. With calls being placed continuously by the many employees in the center, background noise built up and became a real problem for workers who were unable to hear over the noise created by their coworker’s calls.

The excessive background noise was distracting workers and creating a difficult environment for them to focus in. The difficulties and frustration created by this type of noise problem can lead to decreased productivity and harm performance.

This Credit Union employed the help of Commercial Acoustics in the hopes of resolving the situation before it became even more problematic. One of our soundproofing specialists assessed the building and recommended the installation of several carefully spaced speakers throughout the center. Once in place, the sound masking speakers play a white noise designed to eliminate background noise in critical listening environments.

The background noise was effectively masked by the equipment we installed, solving the call center’s problem and improving the overall quality of the workplace. The newfound quiet will allow for greater concentration among employees and likely lead to an increase in productivity.

The Commercial Acoustics Team is happy to have played a significant role in the bettering of this credit union’s call center.

Understanding Expected IIC and STC of Assemblies – Case Study

An architectural firm in Florida is undergoing the process of reviewing standard details in their design assemblies, including the expected IIC and STC of these assemblies. Since these details are used on a number of developments, it is critical to understand how these details are performing in the field and compare those against the expected values in the laboratory tests.

A drawing package review was completed prior to the site visit. Testing was performed with representation from the Architecture team and Construction team present.

This report includes findings from the design review and site observations, as well as all testing data compiled in Appendices A-E.

Findings

  1. WF-9 Tenant-to-Tenant Wall

The first test was conducted on WF-9 Tenant-to-Tenant Double-Stud Wall (Appendix A). This wall had a 10” top plate spanning the two sets of 2×4 studs. The shared top plate diminishes the sound-blocking capacity of this wall from an STC 55 to STC 51 (see Appendix H, figures 10 and 11) below, since it allows direct propagation of noise through the wall along the top plate. Since there is only a top plate connection, and no bottom plate, the expected STC may be closer to 53. Upon discussing with the architect, this top plate is necessary for fire-stopping and draft control. However, if another means of fire stopping may be implemented, such as plugging the 2” air gap with plywood, then the wall may perform closer to its lab value.

After the field test was complete, a leak check was performed on this wall, to determine if more sound was transmitted through it in some locations than others. The SPL (Sound Pressure Level) Meter peaked about 3-5 dB at the base of the wall, indicating there was some flanking at this location. While not as significant as some field tests, adding a thin bead of acoustical sealant just along the bottom of the wall may improve the field STC of the system by several points.

Overall, the ASTC of 50 is above the Florida Building Code minimum.

  1. WF-4 Breezeway Corridor-to-Unit Wall (Kitchen)

The next test was conducted on WF-4 Breezeway Corridor-to-Unit Wall (Appendix B). This wall utilizes resilient channel, but the contractor also used blocking to support cabinets in the kitchen. This compromises the integrity of the resilient channel, which works by decoupling the drywall from the studs. By screwing into the blocking through the drywall, the effectiveness of the resilient channel is greatly reduced.

While an STC of 56 is indicated on the Wall Schedule, no Acoustic Test # is referenced, unlike Acoustic Test # TL-93-265 which was referenced in WF-9 in the wall schedule (See Figures 1 and 2 below).

The attached Figure 12 in Appendix H indicates that this assembly will test to an STC of 50.

As a rule-of-thumb, STC ratings referenced in the wall schedule should have the accompanying Acoustic Test # available for review. The actual Acoustic Lab Test report should also be provided in the design package when possible.

The door appeared to be the primary flanking path in the kitchen. A door STC specification was requested from the construction submittal package, and is included in Appendix F. The STC of 24 for the door is much less than the STC of 50 for the walls. Using a heavier-gauge door, and improving the weather stripping to acoustic seals and sweeps would further improve the performance of this wall system.

commercial acoustics acoustical test

Figure 1: WF-4 From Wall Schedule

commercial acoustics acoustical test

Figure 2: WF-9 From Wall Schedule

    3. WF-4 Breezeway Corridor-to-Unit Wall (Closet)

As a control, a field test was performed on WF-4 between the unit closet and corridor. While there was substantially less wood blocking used in the closet, due to the lighter weight shelves compared to the kitchen cabinets, it still appeared to affect the performance of the wall assembly.

The ASTC of 43 is slightly below the Florida Building Code allowable limit.

To improve the ASTC of the wall, a different resilient mount system may be used (such as Genie Clips) or a differing wall system that incorporates a soundproofing membrane rather than a resilient mount. See Appendix G for options.

4. Kitchen Flooring (FC-1)

The Kitchen Floor was tested, and results are available in Appendix D. The flooring system consisted of 20mm thick wear layer Luxury Vinyl Tile, ¾” Gypcrete, AccuQuiet D18, ¾” OSB, 20” deep Wood Floor Truss, R-13 Batt Insulation and Resiliently Mounted 5/8” Type X Drywall.

There were a few concerns associated with the location of the underlayment:

  • The underlayment was used under the Gypcrete layer, but was only located under the section of the floor where LVT was used. This creates a number of flanking paths. For instance, structure-borne noise (from footfall or other sources) may travel through the Gypcrete, around the underlayment, and into the OSB subfloor. This bypasses the underlayment layer, reducing the effectiveness of the floor. Furthermore, since the underlayment is below the Gypcrete, additional layers cannot be added in the future, and it cannot be used to spot-treat as a topical sound mat can. Overall, this type of underlayment is effective, but must be used throughout the entire area where the Gypcrete is isolated.
  • The Floor Perimeter Isolation Strips were only installed in the kitchen area. This introduces additional flanking paths. Also, it makes it very difficult to retrofit the apartment for future purposes, since removing the carpet for LVT would then be well below the Building Code requirements.

Beyond the location of the underlayment, the product selection raised a few questions. Upon inspecting the submittals and contacting the manufacturer, there was no acoustical testing available for the AccuQuiet D18. While the manufacturer claims it may improve IIC from 6-12 points, no further testing or documentation was available.

Figure 3: AccuQuiet D18 Sound Mat – Specifications

There is no Acoustic Test listed in the Construction and Referenced Assemblies (A 1.04A). Similar to the wall assemblies, an IIC and STC of the floor should be made available in the design package.

The AIIC of the floor was measured at 43, which is below the Florida Building Code.

5. Living Room Flooring (FC-1)

The Kitchen Floor was tested, and results are available in Appendix E. The flooring system consisted of Carpet with Padding, ¾” Gypcrete, ¾” OSB, 20” deep Wood Floor Truss, R-13 Batt Insulation and Resiliently Mounted 5/8” Type X Drywall.

The AIIC of the floor was measured at 58, which meets and exceeds the Florida Building Code.

 

Conclusion & Recommendations:

Overall, of the 5 tests conducted, 2 tests met the Florida Building Code, Section 1702.2 and 1702.3 for Sound Attenuation. The tests that did not meet the Building Code were the Floor-Ceiling test in the Kitchen, Corridor-Unit test in the Kitchen, and Corridor-Unit test in the Closet.

The tests that did not meet code were generally within a few points of the field test requirement, which is an ASTC and AIIC of 45.

Options to consider for further improvement of acoustical performance include:

  1. Specify an acoustically-rated underlayment under the Luxury Vinyl Tile in the kitchen and bathrooms, and include the lab test and floor IIC ratings in the Floor Schedule (see Appendix G)
    1. If using a sound mat under the gypcrete, ensure it is used throughout the entire space, and ensure perimeter isolation strips are used, to prevent flanking
    2. If using a sound mat above the gypcrete, this is not necessary
  2. Remove the shared Top Plate on the Double-Stud Wall Assembly and instead meet the fire blocking requirements with a separate material along the top
  3. Use a different assembly for the corridor-unit wall that does not rely on resilient channel, since this is compromised by the use of blocking in the closet and kitchen
  4. Add thicker, acoustically-rated weather stripping (door seals and sweeps) to the front door to reduce corridor-unit noise transfer
  5. Use a thicker, heavier-gauge door in the kitchen to reduce transmission through the door

Appendix A: ASTC Test – Wall Between 4206 Living Room and 4207 Living Room

commercial acoustics acoustical testing astc

commercial acoustics acoustical testing

Figure 4: ASTC of Wall Between 4206 Living Room and 4207 Living Room

 

Appendix B: ASTC Test – Wall Between 4206 Kitchen and Corridor

commercial acoustics acoustical testing kitchen and corridor

commercial acoustics acoustical testing

Figure 5: ASTC of Wall Between 4206 Kitchen and Corridor

 

Appendix C: ASTC Test – Wall Between 4206 Bedroom and Corridor

commercial acoustics acoustical testing bedroom and corridor

commercial acoustics acoustical testing

Figure 6: ASTC of Wall Between 4206 Bedroom and Corridor

commercial acoustics acoustical testing

commercial acoustics acoustical testing

Figure 7: AIIC of 4206 Kitchen and 4106 Kitchen (Luxury Vinyl Tile)

Appendix E: AIIC Test – Floor Between 4206 Living Room and 4106 Living Room (Carpet)commercial acoustics acoustical testing aiic test

commercial acoustics acoustical testing living room

Figure 8: AIIC of 4206 Living Room and 4106 Living Room (Carpet)

 

Appendix H: Supporting Lab Testing

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Figure 10: Lab STC of Double Wood-Stud Wall

commercial acoustics acoustical testing

Figure 11: Simulated STC of Staggered Wood-Stud Wall with Shared 10” Top Plate

commercial acoustics acoustical testing

Figure 12: Lab STC of Wood-Stud Wall with Resilient Channel

 

Cancer Treatment and Research Center – Case Study

soundproofing and acoustical treatment for medical centers

A cancer treatment and research center is undergoing a renovation to replace wood flooring with terrazzo. The reverberation in this space has already raised some complaints, and the more reflective floor covering is expected to create more. These issues are most noticeable during events hosted in the atrium with amplified loud speakers.

A reverberation test was set up in the main atrium to determine the reverberation at A-weighted frequencies and speech frequency ranges.

Test Method:

3 different impulse noises were used as the noise source. First, a loud speaker with white noise was cut off to allow measurement of reverberation. Secondly, hand claps were used as an impulse. Both methods failed to produce conclusive readings in the frequencies below 1000 Hz. Finally, 2”x4” wood studs were clapped together to create the noise source. The results were averaged together to yield the RT60 (“reverberation time”) value at each location.

A Type 1 SPL (Sound Pressure Level) meter was used to capture the amount of time it took the initial noise to decay by 60 dB at each frequency range. These results are displayed below in Table 1.

Test Results:

Location

800 Hz

1 kHz

1.25 kHz

1.6 kHz

2 kHz

2.5 kHz

3.15 kHz

4 kHz

5 kHz

6.3 kHz

RT60

Point 1

3.41

3.16

3.21

2.97

2.78

2.42

2.27

2.3

1.89

1.44

2.8

Point 2

3.51

3.13

2.67

2.58

3.14

2.33

2.04

1.88

1.73

1.26

2.67

Point 3

2.71

2.62

2.48

2.53

2.25

2.04

2.11

2.01

1.6

1.39

2.39

Point 4

3.95

3.9

2.48

2.61

2.46

2.25

2.13

2.11

1.75

1.5

2.47

Point 5

3.68

2.82

2.97

2.75

2.37

2.28

2.13

2.03

1.78

1.34

2.59

Average Reverb

2.58

Table 1: Reverberation Results

commercial acoustics acoustical testing reverberation

Figure 1: Reverberation Test Locations

commercial acoustics reverberation criteria

Figure 2: Reverberation Criteria with Various Venues

Recommendations:

In order to achieve a desired reverberation time of 1.45-1.9 seconds for a multi-purpose auditorium or venue, additional absorption materials will need to be added to the space.

After discussion with the client, it appears that installing these closer to the floor will yield significant savings due to the 56’ height of the room.

Using a simple Sabins calculation, the use of 48 panels at 2’x4’x2” thick, with an absorption factor of 1.05 NRC, will be sufficient to reduce the reverberation down to acceptable levels. While this characterization may be over-simplified due to the cavities and non-parallel surfaces in the space, it has been normalized to the readings taken in the field.

The Salvador – Multifamily

multifamily soundproofing florida

When developing luxury hotel and condo units, sound transmission and privacy are a top concern.

During the design of luxury spaces the target STC for demising walls are typically above the STC 50 minimum, and are closer to 53-58 depending on location and luxury standards.

Instead of adding multiple layers of drywall to the assembly or using double studs to improve sound transmission, The Salvador in St. Petersburg chose to use Commercial Acoustics Wall Blokker sound membrane.

The Salvador is a 13-story green certified building which houses 74 luxury condo units and is located in the heart of downtown St. Pete.

Stadium Soundproofing – Atlanta, GA

Falcons Stadium soundproofing

Commercial Acoustics works with a variety of entertainment venues and sporting arenas nationwide, most recently assisting the Atlanta Falcon’s Mercedes-Benz Stadium in their stunning $1.5 billion stadium (complete with solar panels, fan plaza and retractable roof).

Inside the stadium in the premier seating will be ‘Super Suites’, private and personal boxes to accommodate fans looking for priority game day access and extensive catering and wet bar options. With all the perks and VIP access within the Super Suites, enhancing the game day experience by reducing sound transfer into the space was a top priority. During construction the architect and contractors researched sound-dampening options, choosing Commercial Acoustics Wall Blokker soundproofing membrane to be hung on the ceiling of the suites above the Acoustical Ceiling Tiles to deflect soundwaves and create privacy.

Using soundproofing membranes and techniques is becoming a more common feature in high-end venues when privacy is highly-sought.

Marchman Technical College – Educational, Acoustical Absorption

acoustical treatment for school cafeteria

Noise control and sound privacy within educational settings are imperative. During the design process, target STC’s for walls should be discussed and mandated by the architect, but oftentimes topical acoustical treatment for larger spaces is held until after construction is complete. With the hard, reflective surfaces present within gymnasiums, cafeterias, and auditoriums, acoustical absorption is needed to maintain speech intelligibility and reduce reverberation.

The architects for Marchman Technical College consulted with Commercial Acoustics for their cafeteria space, where we supplied them with 100 PVC-wrapped baffles to absorb soundwaves. After installing the baffles, reverberation in the cafeteria space was significantly reduced and sound privacy was finally reestablished.