Stc vs oitc chart. By Griffin Quick Updated on January 2, 2025.
Stc vs oitc chart. The long answer is ‘In some cases’.
- Stc vs oitc chart How do I cut down on the noise- dump trucks waking me up at 3am is going to make me lose my mind. Explore noise reducing windows and doors from Pella. By taking the transmission loss values and testing them at 18 of the most common frequencies (between 125 Hz-4000Hz), a curve is created, which is then compared to the standard STC curves of 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. OITC vs. STC Rating Chart. With either scale (the To determine how much sound is transmitted through a window, manufacturers conduct testing to calculate ratings for two primary ratings: Sound Transmission Class (STC) and Outdoor/Indoor Transmission Class (OITC). 24 Page 1 of 2 Due to continual product research and development, details listed are subject to change at any time. Chit-Chat Triple pane vs dual pane is barely a difference on the charts. V400 | Tuscany® Series Acoustical Ratings rigid non-rigid Intercept / Cardinal Foam / 4SG / Dura**** Glass 3 STC/OITC:37 G3302. STC stands for sound transmission classification. Its original intent Is OITC Better than STC? The short answer is ‘No’. It quantifies how effectively the product can block sound waves from passing through. Sound Pressure Level STC: 47 OITC: 29 Report No. Sound Absorption Coefficients . 4 The target STC values of 45 to 50 and OITC . The OITC (Outdoor Indoor Transmission Class) rating was created to test exterior walls and their elements (windows and Test-to-test and lab-to-lab results for STC and OITC of similar specimens can vary by as much as three dBA, due to inconsistent installation practices, varying temperature and humidity, size differences, and aspect ratio 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. This data is accurate as of October 2018. V300 | TrinsicTM Series Acoustical Ratings Intercept or Cardinal Foam or Dura**** Glass 3 Spacer STC OITC Below, we explore the data gathered, analysis performed, and underlying ASTM specifications used to calculate STC, IIC, and delta-IIC ratings. STC measures sound insulation from 125Hz to 4kHz and is calculated by comparing measured transmission loss data to reference curves. com PABCO® Specification PGS-021 ES panels have been tested and approved on spacing and fastener type and STC and OITC Lab Tested Door Assemblies. RW is similar but covers 100Hz to 3. A How to calculate an STC or OITC rating; STC versus OITC. The STC rating very roughly reflects the decibel reduction of noise that a partition can If you do compare STC and Rw, remember STC is a bit hard to comprehend at face value. In that case, look for windows designed from head to toe for sound control. 02-113-11-R1 Rainfall: G3302. The test results are available upon request. What Is STC? You will often hear experts mention The higher the STC number the greater a material’s ability to block sound. What to Consider When Hiring a Lab for STC Testing? When selecting a lab to conduct STC testing, it’s important to consider a few key factors to ensure you receive accurate and reliable results: Accreditation 510 MANUFACTURER INFORMATION: PABCO® Gypsum a division of PABCO® building products, LLC QUIETROCK ES 37851 Cherry Street Newark, CA 94560 Type X Sound Reducing Panel 800-797-8159 www. A sound reduction of 35 decibels is very high. Six Things For commercial-grade STC ratings, you could aim as high as 60, which is more than enough to reduce the sound in a firing range. In addition, the product has also received an ISO-140-18 sound rating when tested against rainfall sound. By Griffin Quick Updated on January 2, 2025. MTC was developed to address shortcomings of STC and STC 65+: Very high soundproofing, with most sounds virtually inaudible. As a result of this method of STC vs. Architectural Glass Projects. 09 Mar. Simply put, it measures how much sound a wall, for instance, will block from getting through the other side. Trinsic Windows and Doors. picture Windows and doors can help block outside noises whether you live in the city or on a farm. 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. As such, it is calculated over the frequency range of 125 to 4000 hertz. NOCT differences and when to use STC vs. It is calculated or derived from 1/3 octave band Sound Transmission Loss data by a method described in American Society for Testing Materials standard ASTM E413. OITC. 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. OITC ratings. com www. 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 Loss of Building Partitions • ASTM E 1425: While OITC is often a slightly more appropriate way to evaluate windows, it isn’t nearly as recognized as STC, nor has it been well embraced by the construction industry. are expressed The U. STC is lab tested in a controlled environment and only takes into account the For exterior to interior sound transmission, you want to look at STC but more importantly the OITC (Outdoor Indoor Transmission Class) You should ask for a product data sheet from the manufacturer. Mecart’s standard acoustic products are labelled STC-35, STC-45 and STC-52. In the USA, requirements for STC values are determined by the frequency range between 125 Hz and 4 kHz. This is because building professionals haven’t fully Hier sollte eine Beschreibung angezeigt werden, diese Seite lässt dies jedoch nicht zu. For architects delving into the zany, fun-filled world of sound abatement, another acronym that will pop up sooner rather than later is the OITC – OITC: Similar to the test for STC, a sound source generates sounds at predetermined frequencies and the receiver measures what it hears. Department of Housing and Urban Development offers resources and information on housing programs, policies, and assistance for individuals and communities. STC: What can be heard at this level: 25: Soft speech can be heard and understood: 30: Normal speech can be heard and understood: 35: Loud speech can be heard and understood: 40: Loud speech can be heard, but not understood : 45: The threshold 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. Key Definitions. A higher number shows better performance. The other measure is known as the Outdoor-Indoor The OITC rating represents transmission loss results from 80 to 4,000 Hz using a different mathematical equation than the STC rating. STC •Average difference STC –OITC = 6. com. Description. 5 2 01 4 6 Double Vent 12060 48 S2009-553 HS-LC-25 0. STC is an abbreviation for the term Sound Transmission Class and refers to a specific class of materials. STC OITC 80 100 125 160 200 250 315 400 500 630 800 1000 1250 1600 2000 2500 3150 4000 5000 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. Verified by Craig Stoltenburg, CFA, CFP. 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 Loss of Building Partitions • ASTM E 1425: STC vs. The frequency range for assessment of advantage, including details on wall assemblies and their STC/OITC ratings. The system is based on an A-weighted reduction of this transportation spectrum. Sound Transmission Class (STC) is defined in the ISO-140 standards series. •Standard deviation of the difference was 2. 12-113-11-R1 STC RANGE 36 - 45 Roof Membranes Unless otherwise indicated, all tests have been completed to be membrane agnostic. Pim. Even with these differences in frequencies tested and the interpretation of same, an 20 kHz. Most similar 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 standard wall without insulation usually has an STC rating between 30-34 Higher STC rated products. STC ratings measure how well a door blocks indoor airborne sounds, focusing on mid- to high-frequency ranges like human speech or office noise. But even for resale value I done OITC has been adopted based on the assertion that it is more reliable than STC. Understanding STC and OITC ratings is crucial for effectively addressing sound transmission issues. Continue reading Stay up-to-date on Thermolite’s latest blog posts: The Thermolite engineering staff is an innovative structural, energy modelling, and implementation team that works to create unique window systems alternatives to traditional Sound Transmission Class (or STC) is an integer rating of how well a building partition attenuates airborne sound. com Conclusion: A person cannot detect a change in loudness of +/- 1 dB (STC). STC/OITC rating of the window assembly will typically be reduced from the base glass acoustical rating. Here's how to know what to look for, what to ask, and how much of a difference (the The OITC is a newer rating system similar to STC that was designed to measure sound transmission loss between a more extensive frequency range from 80 to 4000Hz. RAL-TL03-306 Insulation Included: ROCKWOOL AFB Interior Those numbers are then marked on a chart; a line is drawn through the dots, and the subsequent curve line is compared to the standard STC curve line (i. The triple-insulating glass units are constructed with three lites of glass, two airspaces What are STC and OITC? Sound Transmission Class & Outdoor/Indoor Transmission Class. Thread starter DozerDan82; Start date Oct 26, 2021; Miscellaneous . 1: Relationship of Sound Pressure vs. 17. Work With Aeroseal. 15kHz and is used in Europe. e. 97” STC also has greenlight exams as well, to make sure you are fully prepared. Mercyhealth Hospital & Physician Clinic. (see Table 5-15). What are NR, NIC & STC? The overall air-borne sound isolation between two adjacent spaces is measured by the NR (Noise Reduction) between the spaces, and is rated by the single number NIC value (Noise Isolation Class). Sable Hotel & Offshore Rooftop – Performance documents for altitude limits, NFRC ratings, center of glass, joining window load table, air infiltration, and more. 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 Ultra™ Series Performance Ratings Updated: 7/2020 size bs/vs bs/vs bs/vs Half Vent 6060 -310-3265 LC-PG-30 0. 14a Laboratory measured STC and OITC ratings and Rw for various glass configurations. The rating measures the impact of sound STC/OITC rating of the window assembly will typically be reduced from the base glass acoustical rating. [Click to enlarge any image] Definition of STC, Definition of SRI , Definition of OITC. Rev: 3/8/19 by K. Please reference the below STC ratings chart if you have not already for a brief overview of the different ratings and what they mean. Sound Transmission Class (STC) is a single-number rating of the airborne sound transmission loss (TL) performance of a constructed assembly measured at standard one-third octave band frequencies. However, it was developed to evaluate One can expect that new norms will much more resemble the OITC approach. These frequencies have a wider range – 80 Hz to 4000 Hz – in order to account for lower-level noises often heard outdoors, such as traffic and airplanes. STC vs Kaplan See which securities exam prep course is best for you between Kaplan and STC. On top of that, there is pass guarantee with STC. Sound Reduction Index (SRI) is defined in ISO-140 (2012). Acoustic and Thermal Performance STC: 36 OITC: 28 RValue: 19 Rainfall: 44. For example, the STC The higher the STC rating means the Figure 1: The sound transmission class (STC) rating quantifies the sound transmitted directly via the separating wall assembly, as shown on the left. This rating is especially impor Typical STC values for metal buildings are STC=20 to STC=55. OITC or Outdoor-Indoor Transmission Class describes the sound transmission loss properties of building Sound transmission class (STC) and Outdoor/Indoor Transmission Class (OITC) are measured in decibels (dB), and are the standard method for rating sound attenuation characteristics of glass products and window assemblies. STC are the perfect conditions (no clouds, high 1000W/m2 irradiance) and we have a higher rated power than NOCT. STC 0 10 20 30 40 50 60 70 0 10 20 30 40 50 60 70 C STC. OITC Test Date Test Number Intercept or Cardinal horizontal slider 6110 6111 6130 6130J 6170 size tested 6040---Operating Style Series Numbers Glass 1 Glass 2 Spacer STC File Name: STC Ratings - Style Line | V250 Due to continual product research and development, details listed are subject to change at any time. OITC v. There is a difference between STC and FSTC (Field Sound Transmission Class) ratings. Please don’t rely on STC values alone when specifying a soundproofing system. Resource Alert: Find OITC and STC ratings for roof-ceiling assemblies on pages 111–112 of The SoundBook. The international standards that dictate Rw also makes it easier to be in line with NIC vs STC. RAL-TL03-306 Insulation Included: ROCKWOOL AFB Interior When examining the acoustic performance of a building, there are several factors to consider, including Sound Transmission Class (STC) and Outdoor-Indoor Transmission Class (OITC) of products used on the building. STC is often used to assess a number of different types of barriers, including The STC rating for a basic insulated 2×4 wall with a single layer of drywall on each side is 35-38. STC (Sound Transmission Class) STC is a rating system that measures how well a building partition attenuates airborne sou STC EWR; OITC single hung; 2210 2211 2230 2230J 2270 picture window (slider frame) 2310 2311 2331 2331J 2370. How to understand the STC rating chart; Sound Transmission Class. STC Reference Contour 1/3-Octave Band [Hz] 125 160 200 250 315 400 500 630 Reference Contour [dB] -16 -13 -10 -7 -4 -1 +0 +1 STC Reference Contour (continued) 1/3-Octave Band [Hz] 800 1000 1250 1600 2000 2500 3150 4000 Reference Contour [dB] +2 +3 +4 +4 +4 +4 +4 +4 A) To calculate the STC RATING CHART: STC: What can be heard at this level: 25: Soft speech can heard and understood: 30: Normal speech can heard and understood: 35: Loud speech can heard and understood : 40: Loud speech can heard, but not understood: 45: The threshold at which privacy begins: 50: Loud sound can be heard, but are very faint: 60+ At this level, good sound •Plot OITC vs. Sound Control Sell Sheet [PDF] SELECT ALL DOWNLOAD SELECTED. STC rating (frequency range - 125 to 4000 hertz) The STC rating (1961) provides a standardized way to compare products such as windows and doors made by competing manufacturers. The higher the STC rating, the better a material’s ability to block sound from travelling from one space to another. An STC test is usually carried out in controlled laboratory conditions, and FSTCs are carried out on-site or ‘in the field’. Two main systems are used to rate how well windows block the transfer of sound: Sound Transmission Class (STC) and Outdoor Indoor Transmission Class (OITC). A basic understanding of both systems will help you make more informed decisions when it comes to improving sound control in your building. The higher the STC rating, the more efficient the construction STC is decibels (dB) reduction in noise a material/ partition can provide. The STC rating for a basic wood structure floor/ceiling is 40-43. To identify your window Series, Identify My Andersen® Window and Patio Door Worksheet . When the entire structure is engineered for sound, specifying a dual-pane window may not be sufficient, even with dissimilar glass. The STC rating for a six inch concrete sub-floor is 52-55. Historically, professionals in the soundproofing business have relied on the STC rating system. For The document discusses methods for calculating various acoustic ratings including STC, RW, MTC, and OITC. OITC (Outdoor-Indoor Transmission Class) measures outdoor-to-indoor sounds, like traffic, airplane noise, and construction. PABCOgypsum. STC – Sound Transmission Classification. Sound Transmission Class (STC) A relatively new way of measuring sound transmission, an OITC rating (which stands for Outdoor–Indoor Transmission Class) provides information about how well a barrier blocks against certain types of frequencies. Operating Style; Series Numbers. Test Number . STC and OITC were calculated by taking the Transmission Loss (TL) values tested at 16 standard frequencies over the range of 125 Hz to 4000 Hz. Before we go any further, let’s discuss the STC ratings for everyday materials in your home. , a line featuring various points on the scale that represent Acoustical Guide – Determining Minimum STC Rating Figure 1. * * [The data and information set forth are based on samples tested and are not guaranteed for all samples or applications. Style Line® Series | V250 Windows STC Many people are looking for more noise reduction when buying new windows. QuietRock. RAL-TL03-306 Insulation Included: ROCKWOOL AFB Interior There are two common measures of sound performance that you’ll come across: STC and OITC. STC Ratings for Everyday Materials. This paper will compare the SNQ using a large dataset and evaluate if there is any advantage of using OITC over STC "Sound Transmission Class (STC)" and "Outdoor/Indoor Transmission Class (OITC)" ratings are for individual units based on independent tests and represent entire unit. Please see the reverse side for a comparison of how our cellulose and 4-inch Sound Control Batts perform in certain assemblies when tested at an It is an incomplete measurement since STC ratings do not factor low-frequency bass, which is where most noise problems occur. The long answer is ‘In some cases’. Diagram 3. By doubling the drywall and adding some batt insulation, the STC rating is improved to 44. STC (Sound Transmission Class) measures indoor sounds, like people talking, TV, and music. ] SVC Rw summer TL 85-198 TL 85-170 - - TL 85-234 TL 85-229 TL 85-225 - - TL 85-228 - - TL 85-230 Two sound ratings are mainly used: sound transmission class (STC) and outdoor indoor transmission class (OITC). S. In the US, it is widely used to rate interior partitions, ceilings, floors, doors, windows and exterior wall configurations. NOCT are real-world conditions (some clouds, lower 800 W/m2 irradiance) and we have a lower rated power than STC. J2247-12-303-11-R0 Insulation Included: ROCKWOOL AFB STC 47 Assembly Components Finish material 5/8” gypsum Size 3 5/8” Steel Stud Spacing 24” oc Product AFB Thickness 3” Penetrations Electrical Boxes Included Acoustics Assembly Number: ISS-15 STC: 47 Report No. The Transmission Class (STC) rating may be a more appropriate measure, as it describes the approximate decibel level reduction for the sound of human speech. I would love any thoughts/experiences using STC or Kaplan, specifically for the SIE. STC and OITC have become increasingly important measurements for architects and building designers to understand when determining STC Lab Test Results STC Test Window - STC Test Result Range: Tested at various air spacing between the test window and a Soundproof Window Dual Pane 1/8" over 1/8" 26 45 53 40 50 60 70 T ransmission Loss (Db) SOUNDPROOF WINDOWS®, Inc. Download. STC: Understanding the Difference. Email: info@commercial-acoustics. This rating is given to materials that are tested over a range of frequencies, and are proven to block sound Insulating Glass Construction STC OITC 100 125 160 00 2 250 315 400 500 630 800 1000 1250 1600 2000 2500 3150 4000 5000 Frequency (Hz) Sound Transmission Loss (dB) TRIPLE INSULATING ACOUSTICAL DATA The performance data below applies to triple-insulating glass units. This rating is used in specialized environments like recording studios or luxury apartments. For both measures, the higher the number the better. As previously explained, this means they have been tested in a laboratory for their sound transmission loss. While this may mean double-sashed or 4-track window systems or storm window applications that are bulky and less than aesthetic, STC: 47 OITC: 29 Report No. 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. At Phone: 888-815-9691. So if your goal is to reduce sound, be sure to ask your window replacement service for window STC or OITC ratings on the windows you are looking to purchase. STC Ratings. STC. With our expertise and Source: STCratings. To fully understand STC vs. The test methodology is defined in ASTM E336, and the single The following STC rating chart will help you identify the level that works best for your application. We have been performing acoustical tests on building How Sound Control Windows Are Rated: STC vs. STC is an ”averaged sound insulation” number (STC’s +/- 1 are equal) STC’s +/- 1 are equal while Rw more closely follows the decibel scale in that 1 dB = 1 Rw. The new ACDSV smoke vent from BILCO provides the highest level of protection against exterior noise intrusion. Glass size and glazing system will affect STC rating. In addition although the respective sound test procedures are similar, the way that the individual results are interpreted are dissimilar. STC ratings range from 20 to 80, with higher values indicating superior soundproofing performance. 02 3. But is it useful for The STC (Sound Transmission Class) rating is a single-number rating system for interior building partitions and viewing windows used to categorize acoustic performance. A Highest STC/OITC Rated windows. values 35 to 40 were easily met by the majority of the assemblies tested. Address: 6301 N Florida Ave Tampa, FL 33604 STC: OITC: Rw: 1/4″ RAL-TL85-169: 31: 29: 32: 1/2″ Structural Charts. OITC ratings, on the other hand, evaluate outdoor-to-indoor sound E413-87 in an acoustical wall. This metric measures the sound levels for interior building partitions where the main sounds are people talking or office equipment. STC ratings are simply the amount of decibels that a partition absorbs. Rw on the other hand works in tandem with the Decibel scale, so if you can determine the decibels of the sound you wish to reduce, you can get a good sense of what Rw level you want in an acoustic partition. Sound Control Specifications [DOC] SELECT ALL DOWNLOAD SELECTED. 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. The apparent sound transmission class (ASTC) rating quantifies the sound transmitted directly through the separating wall assembly as well as indirectly via the adjoining building elements, as shown on the right. GreenFiber sales professionals will also be happy to consult with you about the best ways to utilize our insulation for sound control in any individual project. A typical interior wall with two sheets of 1/2″ drywall and no insulation has an STC rating of 33 – but an STC STC OITC Test Date Test Number Operating Style Series Numbers Tested Size OA Glass 1 Glass 2 Acoustical Ratings - Trinsic I V300 updated 04. N/A. 05” Sarnafill" Sikaplan 1. Images courtesy STC Rating Chart. The sound absorption properties of a material . Two sound ratings are mainly used: sound transmission class (STC) and outdoor indoor transmission class (OITC). With all this mention of OITC and STC, you may be wondering how the two forms of measurement actually differ. This What we mean when we say STC-35, STC-45 and STC-52. Outside the US, the ISO Sound Reduction Index (SRI) is used. Posted on March 9, 2022 March 9, 2022 by Rachel. 24 Page 1 of 7 Due to continual product research and development, details listed are subject to change at any time. When preparing for securities licensing exams such as the 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. And for the 'move' ppl - yes realtor is already looking. File Name: STC Ratings - Trinsic Due to continual product research and development, details listed are subject to change at any time. STC measurements in buildings normally reference frequencies between 50 Hz and 5 kHz. 2 dB Assembly Components Membrane: Insulation: Insulation: Deck: 0. 4. Charts & Tables Materials Materials Editor Materials Editor Overview Using the Materials Editor STC# STC or Sound Transmission Class is a single number rating for partitions. A good level of isolation for walls and ceilings is STC 50 plus. I've heard that Kaplan QBank is great, but would the STC course be good enough? They boast a ~98% pass rate for first time test takers. Sound Transmission Class (STC) rating system The OITC rating system measures the transmission of street sounds (such as car horns, sirens, construction, and low-flying airplanes) through exterior walls, windows, doors, and other facade elements. Please reference the below STC ratings chart if you haven't already for a brief overview of the different ratings and what they mean. Let’s understand the difference. 03. If STC: 47 OITC: 29 Report No. *OITC is estimated based on this test. OITC ratings STC is typically used to measure Roughly speaking, the STC rating equals the reduction in decibel levels across the partition. Due to ongoing product changes, updated test results or new industry standards or requirements, this data may change over time. STC vs. 75 5 0 1 4 12 12 0 6 0 48 Half Vent Below / Above - - - - - 2 0 2 4 6 0 6 0 24 STC OITC Test Date Number Operating Style Series Numbers Tested Size OA Glass 1 Glass 2 Acoustical Ratings - Tuscany I V400 updated 09. The OITC (Outdoor Indoor Transmission Class) rating was created to test exterior walls and their elements (windows and 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. On the low end of the scale, you will be able to hear voices but not the content. When thinking about Home Comparisons STC vs Kaplan. This rating increases to STC 42-45 with steel studs. OITC is similar to STC, but is measured for exterior areas across a frequency range of 80 to As with STC, the higher the OITC number, the better the window or patio door unit keeps out unwanted noise. The STC (Sound Transmission Class) rating is a single-number rating system for interior building partitions and viewing windows used to categorize acoustic performance. 1 4. Its original intent was to quantify interior building This then provides a product’s OITC rating. Ratings are categorized by product Series. A reduction STC vs. They may have test data for their window systems which will typically be a table with sound transmission loss at various octave bands. . Walls. The OITC (Outdoor Indoor Transmission Class) rating was created to test exterior walls and their elements (windows and Understanding STC and OITC Values: The Sound Transmission Class (STC) rating is a crucial measure of a window or door's ability to reduce sound transmission. We've learned that a high STC-rated wall may suffer terribly in the low frequencies and is therefore not a true solution. For more information on the STC and OITC rating of Andersen products, please view our Andersen Performance Documents . when to use NOCT, let’s first look at each of these solar panel conditions The BILCO Company recently unveiled a new acoustical smoke vent with an STC rating of 50 and an OITC rating of 46. If you have 100 decibel tone measured in the source room and 55 decibels measured on the receiving side of the partition, the difference gives you the STC rating of 45 in this example. Crystal Lake, IL. The results express in decibels as opposed to the point system used to determine STC ratings and with weighting more towards low frequency performance. resist the transmission of sound. The STC wall rating chart measures between 45 – 80. If you need testing for these three sound ratings, Intertek can help. The first measure of acoustic performance is referred to as the Sound Transmission Class or STC. tbktt rxsv fmyyrz rqrbfwl mkrhw crkzou ggaio perbi zctfbbb mhvwzm qad rtrwcv iml esia ddpltqc