Oitc vs stc rating. OITC is based on a scale between 80 and 4,000 hertz.

Oitc vs stc rating Like the STC rating System, OITC measures sound intensity loss in decibels. While standard glass units consist of two panes that are Oct 24, 2020 · STC vs. Ask for our extensive test reports (over 40) using our window with 6 different primary window glass configurations. OITC ratings. To determine the specific STC ratings of glass and a window or door assembly, the following ASTM standards can be used: • ASTM E 90: Standard Test Method for Laboratory Measurement of Airborne Sound Transmission May 22, 2022 · The STC Rating for Windows identifies how different glass types and thicknesses, plus the airspace between glazing in a window, and the frame material can decrease sound transmission. If we assume that a branch of the United States Government, The University of Minnesota, The Minnesota Housing Authority, prominent acoustical engineers and several manufacturers of acoustical products are correct, a change of “1 STC” is equivalent to a change in loudness of Sep 21, 2018 · As with STC ratings, the higher the OITC number, the more sound resistant the product is. When evaluating the soundproofing needs of a space, it’s essential to understand the distinction between Sound Transmission Class (STC) and Outdoor-Indoor Transmission Aug 5, 2022 · E413-87 in an acoustical wall. Despite the fact that the abbreviations are simple, the concepts behind these terms Sep 23, 2024 · Here’s what different STC ratings mean for your soundproofing needs: STC 25-30: Normal speech can be heard clearly through the barrier. Dissimilar glass. 4. Sep 17, 2018 · What we mean when we say STC-35, STC-45 and STC-52. Sound Transmission Class (STC) is a single-number rating of the airborne sound transmission loss (TL) performance of a Nov 16, 2022 · best fits the data gives the STC rating. STC 30-40: Loud speech can be heard, but not entirely clear. Calculating the STC Rating: The STC rating is calculated from a curve-fitting procedure defined by ASTM E413. Mass. This could be considered a baseline when you are getting serious about preventing sound transmission. Whichever curve your graph most closely resembles corresponds with the barrier’s STC rating. Oct 17, 2016 · 在声学泡沫等单一材料的情况下，供应商通常测试材料，以确定它是否满足特定的STC值。在多层复合结构的情况下，绝缘制造商必须确定最终产品是否满足所需的STC评级。STC的计算是复杂的，它们不仅仅是每个材料的STC值的总和。 Dec 26, 2024 · Our secondary window STC ratings range from STC 48 to STC 57. OITC differs from the STC rating in that the OITC was developed specifi cally to indicate transmission of noise from transportation sources. When it comes to age, STC is much older than OITC. The STC (Sound Transmission Class) rating is a single-number rating system for interior building partitions and viewing windows used to categorize acoustic performance. An STC rating provides a standard industry accepted method for comparing the sound reduction effectiveness of various sound doors and windows. STC: This system has Oct 23, 2023 · 声音传输等级 (STC) 评级是用于衡量建筑材料或隔板抵抗空气传播声音传播能力的尺度。评级表示材料或隔板提供的隔音分贝数。 STC 等级根据 ASTM E413-10 标准通过测量不同频率下通过隔板（墙壁、窗户、门等）的声 Dec 22, 2022 · What Are STC Ratings? An STC label delineates how partitions and walls effectively block sound and reduce noise. However, STC ratings can be misleading as they only begin at 125Hz, but we can hear deep sounds from as low as 20Hz. Posted on March 9 The test methodology is defined in ASTM E336, and the single-number rating is defined using ASTM E413. STC ratings range from 0 to 100. Jan 11, 2025 · A standard dual-pane window carries an STC rating of around 27, but requesting the appropriate options can boost that value up to around STC 34. Sound ratings were developed by the American Architectural Manufacturers Association (AAMA) and the American Society for Testing and Materials (ASTM) to standardize the testing and rating of sound transmission for building components, particularly windows. Resource Alert: Find OITC and STC ratings for roof-ceiling assemblies on pages 111–112 of The SoundBook. STC (Sound Transmission Class) STC is a rating system that measures how well a building partition attenuates airborne sou 1 day ago · Phone: 888-815-9691. Someone in a quiet room on the other side may be able to hear that a Jan 7, 2024 · Single Number Ratings •Most SNR (STC, EWR, R w) are calculated directly from the transmission loss spectrum of the •Plot OITC vs. You The OITC rating is similar to the STC rating in that it uses ASTM E-90 TL data to derive a single number rating system that increases with increasing sound isolation ability. 24 Page 1 of 7 Due to continual product research and development, details listed are subject to change at any time Nov 4, 2016 · The OITC rating (referenced in ASTM E1332, Standard Classification for Determination of Outdoor/Indoor Transmission Class) is calculated from the following formula, There is no way to convert from OITC to STC (or vice versa), without access to the underlying TL data. 24 Page 1 of 2 Due to continual product research and development, details listed are subject to change at any time Apr 14, 2022 · To review – there are a few different weight and thickness options for mass loaded vinyl, and each type has a different STC rating. Style Line® Series | V250 Windows 4 days ago · In this article, we will discuss the basics of STC vs. In typical metal building construction the values for STC range from a low of about 20 to a high of 55. The higher the STC rating, the more effective the material is at blocking sound transmission. The other measure is known as the Outdoor-Indoor Dec 31, 2024 · STC Ratings vs. The ability of a barrier to create a specific decibel deficit varies according to the frequency of the sound passing Oct 21, 2013 · Roughly speaking, the STC rating equals the reduction in decibel levels across the partition. Understanding STC ratings for drywall can be complex. OITC is predominantly a measure of low-frequency attenuation, as low Aug 24, 2021 · the sound transmission class (STC) and the noise reduction coeffi cient (NRC). The most commonly used variation of MLV is 1 lb/sf, 1/8″ thick, STC 26 mass loaded vinyl. The average STC rating for a regular single-pane window is 27, while double-glazed windows have an average rating of 29. 14a Laboratory measured STC and OITC ratings and Rw for various glass configurations. OITC v. For the purposes of this conversation, we’re going to focus on sound solutions that address primarily Sound Transmission Class (STC) – no matter how egregious that approach may be to Acoustic Engineers who just coughed up their coffee when they read STC vs. Glass size and glazing system will affect STC rating. Mar 30, 2023 · An STC rating of 45 is really where we get into the world of soundproofing and privacy. STC Ratings. A wall system with an STC < 35 is considered low performance, whereas one with an STC > 55 is considered high performance. For instance, a wall with an STC rating of 60 will offer excellent soundproofing capabilities, making it almost impossible for everyday sounds to penetrate. Jan 30, 2025 · How to calculate an STC or OITC rating; STC versus OITC. Rw ratings are similar to STC in that they follow familiar testing methods. Notably, road noise is a lower frequency sound, so depending on the proximity to busy streets and interstate highways, it is important to consider the OITC rating and look for higher numbers. STC 43 Assembly Components Finish material 5/8” Gypsum Size 3 5/8” Steel Stud Spacing 16” oc Product AFB Thickness 3. The Oct 18, 2023 · Here’s a look at the differences between OITC ratings and STC ratings so you can decide if one or the other — or both — should be used for a project. It is important to keep them in mind for optimal results. com. Apr 14, 2023 · As the table shows, a single pane 1/4” annealed curtain wall window has a STC rating of only 31 and an OITC rating of 28. OITC: Similar to the test for STC, a sound source generates sounds at predetermined frequencies and the The actual 1961 standard which explains how to calculate STC (ASTM E413) describes the limitations of its use: "This single-number (STC) ratings correlate in a general way with subjective impressions of sound transmission for speech, Source: STCratings. STC is typically used to measure sound transmission loss over a frequency range from 125 to 4000 hertz, and is most applicable for interior areas that experience mid to high frequency noises, such as conversation, television, or office equipment. There are 3 types of glass we might find for normal domestic windows. Mar 22, 2022 · Simply put, STC ratings measure sound level on one side of a wall, versus the other side of a wall. 2) for laboratory testing or Professionals calculate a barrier’s STC rating by measuring decibel deficits over a range of frequencies (from 25 to 4,000 Hertz), plotting them on a graph, and comparing the curve with standard STC reference curves. Both OITC and STC indicate a wall’s ability to block the transmission of sound from one side of the wall to the other. The most common, and effective, way to determine sound May 1, 2017 · Single number quantities (SNQ) are useful to specify and communicate acoustical performance to other design professionals. It’s the first level where conversations won’t be understood through the walls. 10). The OITC covers a wider range and lower frequency than the STC. STC Ratings and Soundproof Windows. However, doubling the mass of a barrier does not double the STC May 13, 2024 · STC OITC Test Date Test Number Operating Style Series Numbers Tested Size OA Glass 1 Glass 2 Acoustical Ratings - Trinsic I V300 updated 04. The STC (Sound Transmission Class) rating is a single-num ber rating system for interio r build ing partitions and viewin g windows used to catego rize acoustic performanc e. We can choose the glazing type based on Single, Double, Glass Thickness, Glass Weight, etc. If you need testing for these three sound ratings, Intertek can help. For fenestration testing, transmission loss is recorded on either side of a Oct 10, 2024 · Using STC/OITC Rating Systems when Selecting Products. Let’s Oct 10, 2019 · specify the STC or OITC that is required of the glazing system. For both measures, the higher the number the better. Trinsic Windows and Doors. Similar to STC ratings , OITC ratings provide Nov 16, 2022 · The Sound Transmission Class (STC) method assigns a single number rating to measured Sound Transmission Loss (TL) data obtained in accordance with ASTM E-90. Single or Double Leaf Terrace Doors perform up to STC 61- OITC 49. The OITC rating was developed in 1990 and is typically used to measure sound transmission loss over a frequency range from 80 to 4000 hertz. By doubling the drywall and adding some batt insulation, the STC rating is improved to 44. NIC is a field-tested value that accounts for all the construction systems separating The STC and OITC ratings shall be calculated in accordance with ASTM E 413 and E 1332, respectively. STC 0 10 20 30 40 50 60 70 0 10 20 30 40 50 For example, if a transmitter played a sound at 60 decibels and the receiver picked up 30 decibels, the STC rating would be 30. Like the STC rating, OITC measures sound intensity loss in decibels. 6. Mar 23, 2022 · Sound Transmission Class (STC) is a single-number rating of the airborne sound transmission loss (TL) performance of a constructed assembly Oct 14, 2014 · OITC is similar to STC, but is measured for exterior areas across a frequency range of 80 to 4000 hertz and is therefore more applicable for low frequency noises coming While you may be familiar with Sound Transmission Class (STC) ratings, there is another relatively new way of measuring sound transmission: Outdoor-Indoor Transmission Class (OITC). An STC rating is an instrument measurement of how much noise is stopped. There’s also 2 lb/sf MLV with a stand-alone STC rating of 31, and 0. It is an International Organization for Standardization (ISO) rating and part of the ISO 140 (Acoustic) family. Create a refuge of peace in the midst of an otherwise hectic world -- The luxury of . The best windows to block sound are dissimilar laminated panes with a wide air gap between the glass plates. NRC Ratings. It provides a numerical value Sep 4, 2020 · Frequency (Hz) 100 125 160 200 250 315 400 500 630 800 1000 1250 1600 2000 2500 Apr 12, 2021 · the rating, and Table 3 shows an example worksheet for calculating OITC. OITC Ratings. Mar 23, 2022 · What are STC and OITC? Sound Transmission Class & Outdoor/Indoor Transmission Class. All contours are defined across the one-third octave band range 125 Hz to 4000 Hz, inclusive, One can expect that new norms will much more resemble the OITC approach. Most double-glazed windows will achieve an STC number in the mid- to high-20s. Two sound Jun 20, 2023 · Understanding STC and OITC ratings is crucial for effectively addressing sound transmission issues. Simply type into an acoustic value we need, the system list all the matched compositions. The OITC (Outdoor Indoor Transmission Class) rating was May 22, 2022 · A typical interior wall has a single layer of 1/2-inch drywall on each side with no insulation inside with an STC rating of 33. Outdoor/Indoor Transmission Class (OITC): To find OITC, sound is played at a predetermined frequency from 125 hertz to 4000 hertz. Pim. Thermolite Sound Transmission Loss Test Report Results Oct 24, 2020 · STC vs. *OITC is estimated based on this test. As previously explained, this means they have been tested in a laboratory for their sound transmission loss. A reference contour is fit to the 1/3 octave-band Sound Transmission Loss (STL or TL) values with a maximum of 32 Rw is the alternative to STC and used by most of the world. The OITC is determined from testing between 80 Hz and 4000 Hz. A sound reduction of 35 decibels is very high. Assemblies will be organized by STC value ranging from an STC of 40 to an STC of 57. The blares and beeps of heavy traffic, the roar of airplanes, and the rattle of trains all produce a low Oct 10, 2024 · To determine how much sound a material or assembly can block, we test them and use the results to determine an STC and/or OITC rating. Sound Transmission Class (STC) is defined in the ISO-140 standards series. The first measure of acoustic performance is referred to as the Sound Transmission Class or STC. * * [The data and information set forth are based on samples tested and are not guaranteed for all samples or applications. More mass means more STC. Let’s understand the difference. Glass siz e and glazing system will a˜ect STC rating. It must be remembered that the STC or OITC rating of a glass product does not represent the rating of the glazing system. Dec 20, 2022 · The higher the STC rating, the better a material’s ability to block sound from travelling from one space to another. The OITC (Outdoor Indoor Transmission Class) rating was Mar 9, 2022 · NIC vs STC. 03. Other ratings may be computed using the same worksheet subsituting the appropriate data for the rating instead of the sound transmission loss. com Conclusion: A person cannot detect a change in loudness of +/- 1 dB (STC). Ratings are determined by broadcasting a specific auditory tone near the material, and measuring dB on both sides. STC ratings are used for windows, doors, walls and most building materials. 17. Nov 24, 2022 · The number at which the two curves meet is your STC rating. Understanding Sound Transmission Coefficient (STC) Ratings in Windows. OITC rating (frequency range - 80 to 4000 hertz) The OITC rating (1990) provides a standardized way to May 13, 2024 · Understanding STC Rating. Presentation of Results Aug 21, 2024 · The increased interior pane thickness of STC/OITC glass can dull noise to transform your home environment. Jun 13, 2022 · OITC是在北美地区常用标准ASTM E1332中定义的“室外一室内透声等级OITC”，来代替 STC 评价外墙、外窗的隔声性能。计权隔声量Rw是标准ISO 717-1中定义的一种门窗等建筑构件空气声隔声性能的单值评价指标，由ISO 140中规定的方法测得的100Hz-3150Hz Jan 11, 2025 · In the building products industry, there are two main rating systems used to communicate how well products block sound: Sound Transmission Class (STC) and Outdoor/Indoor Transmission Class (OITC). STC rating was developed to asses several different types of barriers, such as doors, partitions, windows, and both interior and exterior walls. By implementing strategies like enhancing wall and floor constructions, upgrading doors and windows, addressing air vents and ducts, and installing ceiling treatments, you can significantly reduce sound in your units. (see Table 5-15). The installed weight of concrete masonry assemblies can be determined in accordance with CMU-TEC-002-23 (ref. Glass Type. Understanding STC Ratings for Drywall. Ensuring your building meets the proper project and building code requirements for STC, OITC, and IIC sound ratings can ensure that your building's space offers an environment that will be comfortable for occupants and not generate complaints. The higher the STC value, the better its insulation. NRC and address the following points: There are a number of factors that can either improve or reduce the STC rating of a barrier. Outdoor-Indoor Transmission Class (OITC) Recently, a new single-number rating has In addition to windows STC rating charts, there exist STC wall rating charts, STC door rating charts, and more, depending on the specific product you’re looking for. Rankings are then calculated using a non-combined logarithmic Jun 15, 2024 · The STC ratings for windows and glass can range from 18 to 65, depending on the type and thickness of the glass. Address: 6301 N Florida Ave Tampa, FL 33604 Mar 5, 2021 · Delta IIC is a single-number approximation of an underlayment’s effectiveness based on a control hardwood IIC test. The change in the IIC rating between the control assembly, usually hardwood on 8″ concrete slab, and the same control assembly with the underlayment installed, is the Delta IIC Rating for the flooring underlayment. May 14, 2021 · Final file including Rw, OITC, STC, and DB value under different sound Frequencies. Sep 24, 2023 · As you can see, doubling the thickness of single pane windows (monolithic) improves the STC rating by 5 and its OITC by 4. STC indicates how well a window blocks noise. Sound Reduction Index (SRI) is defined in ISO-140 (2012). To determine the specific STC ratings of glass and a window or door assembly, the following ASTM standards can be used: • ASTM E 90: Standard Test Method for Laboratory Measurement of Airborne Sound Transmission Jan 10, 2025 · Precast walls will usually come with an STC rating to save you the trouble of how determining the STC rating of a wall yourself. Sound transmission class (STC) measured in decibels Sound Transmission Class (STC) - The STC rating is a (dB) is the standard method for rating sound attenuation single number value quantifying the ability of a material to characteristics of glass products and window assemblies. A receiver on the May 6, 2024 · ASTM E90, the same test method used for STC ratings, is used to calculate OITC ratings, but the OITC test includes a wider range of decibels between 80 Hz and 4,000 Hz to represent outdoor sounds such as car wheels on a road and engine noises. What is a good OITC rating for windows? So, OITC is the ideal measurement for Peerless acoustic windows & doors. OITC The STC (Sound Transmission Class) rating was created to provide a rating for interior building partitions that are subjected to noises from mid to high frequency noise sources. Desired Acoustic Value. As such, it is calculated over the frequency range of 125 to 4000 hertz. by Steve Champlin. For more information on the STC and OITC rating of Andersen products, please view our Andersen Performance The STC rating for a basic insulated 2×4 wall with a single layer of drywall on each side is 35-38. NWTL140828-03 STC 40 Assembly Components Finish material 1/ Jan 31, 2023 · STC/OITC rating of the window assembly will typically be reduced from the base glass acoustical rating. Oct 31, 2024 · STC/OITC rating of the window assembly will typically be reduced from the base glass acoustical rating. resist the transmission of sound. STC Reference Contour 1/3-Octave Band [Hz] 125 160 200 250 315 400 500 630 Reference Contour [dB] Oct 14, 2014 · Sound Ratings: STC vs. Sep 27, 2024 · STC is generally expressed as a single numerical value. OITC (Outdoor-Indoor Transmission Class) measures outdoor-to-indoor sounds, like traffic, airplane noise, and construction. However, soundproof windows can have an STC rating of 48-54 or higher, providing significantly better sound Sep 3, 2024 · STC OITC Test Date Number Operating Style Series Numbers Tested Size OA Glass 1 Glass 2 Acoustical Ratings - Tuscany I V400 updated 09. Rev: 3/8/19 by K. Email: info@commercial-acoustics. As with STC, the higher the OITC number, the better the window or patio door unit keeps out unwanted noise. ’ You, like most others new to the idea of soundproofing, probably had no idea what these little three-letter acronyms meant. If a 105-decibel above ground subway only registers as 80 decibels after traveling through a Window or wall, the sound experiences a 25-decibel deficit. After a 1/4” Thermolite sound control window was placed behind the same window, the STC rating improved to 43 and the OITC rating improved to 33. A typical dual-pane window has an STC rating of 25-30. The apparent sound transmission class (ASTC) rating quantifies the sound The STC measurement has been around since 1961, so for a long time, that was the only rating to measure how windows performed acoustically, in 1990 the OITC measurement came about as a way to rate outside noise. In general, a barriers OITC rating is lower than its STC rating. By contrast, OITC measures lower frequencies that come from the outside, such as street traffic, auto horns, low-flying planes, and construction noises. When it comes to soundproofing, there are many variables at play, most importantly of which is your specific needs. But they also differ quite a bit: for example, Rw covers a larger frequency range than STC. However, architectural acoustics can often become a bewildering array of alphabet soups (STC, OITC, and IIC, to name a few!), and even acoustically experienced architects and designers can be left scratching their heads. A reduction Jan 18, 2022 · OITC Test Date Test Number Intercept or Cardinal horizontal slider 6110 6111 6130 6130J 6170 size tested 6040--- File Name: STC Ratings - Style Line | V250 Due to continual product research and development, details listed are subject to change at any time. The STC rating has been in existence for many years and is based on speech sounds. Jun 20, 2024 · STC (Sound Transmission Class) and OITC (Outdoor-Indoor Transmission Class) are ratings used to measure the soundproofing effectiveness of building materials, particularly windows, doors, and walls. Professionals in the soundproofing business have depended on STC for much longer than they have OITC ratings. Although the reference Jan 28, 2025 · OITC is similar to STC but measures noise from low-frequency to mid-frequency sources, such as aircraft, trains, and cars. Because it weighs low- to mid-frequency sounds more heavily, OITC is a more appropriate rating System for Windows. Oct 14, 2014. Sound Transmission Coefficient or Sound Transmission Class is an acoustic rating system. STC. To achieve your acoustic goals without settling for more expensive solutions, ask for dual-pane windows with dissimilar glass. It is most applicable for measuring the prevention of low frequency exterior sounds such as automotive traffic, construction, and low 2 days ago · An STC rating of 50 (which is not a typical rating for any window) would block as much as 95% of external noise. Ultimately, STC ratings make it easier for individuals and families to create tranquil spaces to live and work. The latest editions of the standards shall be used in determining the STC and OITC ratings. Jul 19, 2022 · STC EWR; OITC single hung; 2210 2211 2230 2230J 2270 picture window (slider frame) 2310 2311 2331 2331J File Name: STC Ratings - Trinsic Due to continual product research and development, details listed are subject to change at any time. STC 40-50: You can hear some muffled sounds, but not specific words. The OITC rating Oct 14, 2014 · STC vs. These are: Float glass – normal glass panes; Tempered glass – no effect on soundproofing; An STC (Sound Transmission Class) is a single number rating system derived from measured values of sound transmission loss in accordance with ASTM E90 and E413 Classification . Examples would be a 100 Series window Apr 8, 2024 · Sound Transmission Class (STC): The higher the STC number, the more efficient a window is at blocking outside noise. OITC is similar to STC, but is measured for exterior areas across a frequency Sep 14, 2021 · Conduct These Three Sound Ratings. Mecart’s standard acoustic products are labelled STC-35, STC-45 and STC-52. OITC 49. The figures in Column 3 for theA-weighting adjustments are taken from ANSI S1. Selecting the right product for reducing sound coming in from a window is a lot different than soundproofing a bedroom to be used as a podcasting studio, for example. The STC rating (Sound Transmission Class) is a standard measurement used to evaluate soundproofing performance of materials such as sound proof insulation walls. This metric measures the sound levels for interior building partitions where the main sounds are people talking or office equipment. How Is STC Tested? Jul 25, 2023 · components. Dec 4, 2021 · Figure 1. When STC tests are performed, the TMS 0302 requires the testing to be in accordance with ASTM E90, Standard Test Method for Laboratory Measurement of Airborne Sound Transmission Loss of Building Partitions and Elements (ref. The system includes many materials other than glass, including the framing, the glazing gaskets/sealants, insulating glass unit spacer Jul 5, 2024 · the STC value, the better a construction reduces the transmission of sound. *OITC is estimate d base d on this test. ] SVC Rw summer TL 85-198 TL 85-170 - - TL 85-234 TL 85-229 TL 85-225 - - TL 85-228 - - TL 85-230 TL 85-213 1 day ago · Sound Transmission Class (STC) is a measure for rating the performance of a wall system as a barrier to airborne sound transmission between adjacent closed spaces such as offices. Sep 14, 2018 · Figure 1: The sound transmission class (STC) rating quantifies the sound transmitted directly via the separating wall assembly, as shown on the left. 6 lb/sf MLV with a stand-alone STC rating of 22. Common SNQ values include Sound Transmission Class (STC) and Jan 7, 2024 · Outdoor-Indoor Transmission Class (OITC) is the A-weighted level difference based on a reference source spectrum for transportation. [Click to enlarge any image] Definition of STC, Definition of SRI , Definition of OITC. STC is the wall equivalent of CAC. For windows, STC ratings range from 18 to 38. A typical interior wall with two sheets of 1/2″ drywall and no insulation has an STC rating of 33 – but an STC rating of 50 during lab testing and 45 in field testing is the standard in many North American Building Codes. 5” Acoustics Assembly Number: ISS-02 STC: 43 OITC: 28 Report No. If sound reduction is a priority, look for a window in the 30-35 STC range. When searching for soundproofing products, chances are you have stumbled across the letters ‘STC’ and ‘NRC. NWTL140828-03 STC 40 Assembly Components Finish material 1/ Feb 22, 2024 · Differences between OITC and STC. This rating increases to STC 42-45 with steel studs. STC 50-60: Sound is barely heard, providing solid privacy. Jul 25, 2023 · components. OITC is based on a scale between 80 and 4,000 hertz. STC ratings are the ONLY way to accurately compare various noise reduction products. STC Ratings; STC Value Rating Description; 50-60: Excellent: Loud speech heard Jun 13, 2020 · E413-87 in an acoustica l wall. The STC rating for a basic wood structure floor/ceiling is 40-43. The test results are available upon request. Testing shall be performed at laboratories that are accredited under the National Voluntary Laboratory Accreditation Program (NVLAP) STC ratings are an established way to average how much sound is stopped by something. dhwpicg xmdqzh hcjk oemzci upfrzv ndsj qrldqat mfdjxqns vrv sgkypw spzo yfpzb ffnet gib ief