Oitc vs stc. Let’s understand the difference.
- Oitc vs stc is the sound transmission class (STC). Like the STC rating System, OITC measures sound intensity loss in decibels. 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. Acoustical Guide – Determining Minimum STC Rating Figure 1. Email: info@commercial-acoustics. com 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. The STC wall rating for a basic insulated 2×4 wall with a single layer of drywall on each side is STC 35-38. Originally developed to determine the sound transmission between interior walls, STC is the original and most widely used and recognized rating system when it comes to soundproofing. Oct 21, 2013 · Roughly speaking, the STC rating equals the reduction in decibel levels across the partition. It is the average of 16 frequency test points. 03. Mecart’s standard acoustic products are labelled STC-35, STC-45 and STC-52. PDF-1. The STC rating for a six inch concrete sub-floor is 52-55. STC (Sound Transmission Class) STC is a rating system that measures how well a building material or assembly can reduce sound transmission. OITC v. A typical dual-pane window has an STC rating of 25-30. OITC* Frequency (Hz) OITC* Frequency (Hz) 100 125 160 200 250 315 400 500 630 800 1000 1250 1600 2000. May 22, 2022 · A 1/4″ pane of glass with an STC of 31, has an OITC rating of 29, and a double 1/4″ pane window with 1/2″ of air between drops from an STC 0f 38 to an OITC of 34. The frequency range used is typical of outdoor traffi c noises. Our recording studio windows and doors have STC 60+ ratings. With either scale (the OITC scale for exterior glazing or the STC scale for interior glazing) a performance rating of 30, for instance, How the OITC Rating is Measured. *OITC is estimate d base d on this test. STC 30 = This is where most dual-pane windows perform. Dec 31, 2024 · STC Ratings vs. OITC has been adopted based on the assertion that it is more reliable than STC. Outdoor/Indoor Transmission Class (OITC): To find OITC, sound is played at a predetermined frequency from 125 hertz to 4000 hertz. 5” Acoustics Assembly Number: ISS-02 STC: 43 OITC: 28 Report No. com. STC (Sound Transmission Class) STC is a rating system that measures how well a building partition attenuates airborne sou 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. Oct 14, 2014 · STC vs. This is useful for my customers as I can quickly determine which rating system would be more ideal to reference depending on the application. This will also impact the total soundproofing cost of your project. Transmission Class (STC) rating may be a more appropriate measure, as it describes the approximate decibel level reduction for the sound of human speech. Determine Target STCs loss are Sound Transmission Class (STC) and Outdoor Indoor Transmission Class (OITC). The system includes many materials other than glass, including the framing, the glazing gaskets/sealants, insulating glass unit spacer Many people are looking for more noise reduction when buying new windows. Here’s a quick guide to understanding STC grading. The STC (Sound Transmission Class) rating is a single-number rating system for interior building partitions and viewing windows used to categorize acoustic performance. Images courtesy National Research STC OITC Projected Windows INventTM, Flagship, and Psychiatric Product Families Dual Glazed with Access Doors INvent XLT Fixed next to Casement 2 48 x 60 1/4 1-3/4 1/4 42 2250 Series Fixed over Project-Out 2 48 x72 1/4 1-1/2 1/4 39 2250 Series Fixed over Project-Out 2 48 x 72 1/4 Lami 0. The higher the STC rating, the more effective that material is at reducing sound transmission of the most common frequencies. This is because building professionals haven’t fully adopted OITC, and again, STC is better recognized. STC rating was developed to asses several different types of barriers, such as doors, partitions, windows, and both interior and exterior walls. With OITC, the higher the number the more effective the sound mitigation properties. STC testing standards are always updated, so an STC rating from two decades ago won’t be the same as that same rating today. 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). E413-87 in an acoustica l wall. components. Mar 23, 2022 · What are STC and OITC? Sound Transmission Class & Outdoor/Indoor Transmission Class. OITC is predominantly a measure of low-frequency attenuation, as low-frequency sounds are generally the more prevalent in typical urban environments. Sep 17, 2018 · What we mean when we say STC-35, STC-45 and STC-52. 50003 659. S. •Standard deviation of the difference was 2. “In places like New York City, it’s all OITC,” he says. Sound Transmission Loss (dB) 36 33. The results express in decibels as opposed to the point system used to determine STC ratings and with weighting more towards low frequency performance. 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. Like the STC rating, OITC measures sound intensity loss in decibels. OITC, to rely on. Here's how to know what to look for, what to ask, and how much of a difference (the Jun 20, 2023 · Understanding STC & OITC Ratings. Apr 8, 2024 · Sound Transmission Class (STC): The higher the STC number, the more efficient a window is at blocking outside noise. – Full STC test results can help determine whether STC ratings are used for windows, doors, walls and most building materials. 24 Page 1 of 7 Due to continual product research and development, details listed are subject to change at any time U356 RESIC-1 vs Isomax STC and OITC. Unlike the STC, which is based on a noise spectrum targeting speech sounds, OITC uses a source noise spectrum that considers frequencies down to 80 Hz (aircraft/rail/truck traffic) and is weighted more to lower frequencies. STC Rating: The new GE Zoneline has an STC rating of 29. A low STC rating, 20-25, indicates that loud speech is audible. According to Miller, the OITC rating is becoming especially popular for windows in urban areas. Mar 9, 2022 · Rated partition STC values can be converted to overall sound isolation using the following equation: NIC = STC – 10log(S/A) S = surface area of partition (ft 2) A = amount of absorption in the receiving room (Sabins), averaged over octave bands 125Hz to 4000Hz. 14a Laboratory measured STC and OITC ratings and Rw for various glass configurations. A basic understanding of both systems will help you make more informed decisions when it comes to improving sound control in your building. Available nationwide. This metric measures the sound levels for interior building partitions where the main sounds are people talking or office equipment. The STC rating has been in existence for many years and is based on speech sounds. If sound reduction is a priority, look for a window in the 30-35 STC range. Decibels - Decibels, dB, are a simple measurement of how loud something is. The test results are available upon request. Jan 28, 2025 · OITC is similar to STC but measures noise from low-frequency to mid-frequency sources, such as aircraft, trains, and cars. 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. 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. ISO European equivalent of the US STC Class Basically the European approach equals the US approach. Effective sound insulation appears at STCs around the 50s. How are STC and OITC Measured? STC: A sound transmitter and receiver are set up on either side of the window being tested. Address: 6301 N Florida Ave Tampa, FL 33604 May 14, 2021 · Performance Target (OITC, Rw, or STC) ID/City/Country/Glass Usage/Type (Performance Target)-Next-Type Value (One from OITC/Rw/STC)-Glazing Type (Laminated/Laminated IG/Double Laminated IG/Triple Laminated IG)-Interlayer If Needed-Overall Glass Thickness-Datasheet-Generate PDF May 8, 2013 · Video Sound Attenuation Batt Insulation Product Data Sheet Description Acoustic Comparison of Cavity Insulation Types Sound Attenuation Batts (SAB’s) Gypsum Board Insulation Type Test Number STC are unfaced, lightweight, fl exible One layer each side. A receiver on the The OITC covers a wider range and lower frequency than the STC. With STC, a higher rating means increased sound attenuation capabilities (and can be used on exterior glazing systems as well). The main differences are the fre-quency range. STC 43 Assembly Components Finish material 5/8” Gypsum Size 3 5/8” Steel Stud Spacing 16” oc Product AFB Thickness 3. A sound reduction of 35 decibels is very high. Cavities filled with 4. The blares and beeps of heavy traffic, the roar of airplanes, and the rattle of trains all produce a low-frequency cacophony. Explore noise reducing windows and doors from Pella. Outdoor Indoor Transmission Class and the Sound Transmission Class. * * [The data and information set forth are based on samples tested and are not guaranteed for all samples or applications. The long answer is ‘In some cases’. The higher the STC value, the less that sound can be transferred from one space to another. Ron states: You may want to use Soundproof Windows with a higher STC rating in areas like bedrooms and studies, and ones with lower STC ratings in living areas, where noise is less bothersome. 5 fi berglass insulation batts, ⁄8" None TL-92-618 38 5 designed to deliver noise control ⁄8" Glass fi ber TL-93-325 49 5 in metal stud wall Jan 18, 2022 · 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 ratings. The OITC is determined from testing between 80 Hz and 4000 Hz. Outdoor-Indoor Transmission Class 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. Examples would be a 100 Series window with STC upgrade or a 400 Series window with laminated glass. STC equals the 500 Hz band of the reference curve with 0 dB, While R W sets the •Plot OITC vs. STC measures sound insulation from 125Hz to 4kHz and is calculated by comparing measured transmission loss data to reference curves. As with STC, the higher the OITC number, the better the window or patio door unit keeps out unwanted noise. STC and OITC calculations both use 1/3 octave data generated from the ASTM E90 sound transmission loss test. Glass siz e and glazing system will a˜ect STC rating. Oct 10, 2024 · OITC vs. Oct 14, 2014 · interior window retrofits, laminated glass windows, oitc, sound control windows, sound ratings, stc Comments are off 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 While indeed a deviating frequency range does not allow an official OITC value as per the current standard, the method easily allows to adjust the frequency range (explained before in document) resulting in an unofficial single number rating, but which is still much more representative than the alternative STC rating when low-frequent noise is While not as well known as STC, OITC is a more appropriate measure when comparing the true sound control performance of a window. This rating measures higher-intensity noise, such as heavy construction equipment and airplanes. When evaluating the soundproofing needs of a space, it’s essential to understand the distinction between Sound Transmission Class (STC) and Outdoor-Indoor Transmission Class (OITC). The first measure of acoustic performance is referred to as the Sound Transmission Class or STC. 24 Page 1 of 2 Due to continual product research and development, details listed are subject to change at any time Dec 4, 2018 · OITC vs. Q: Are the STC and OITC ratings determined by the same test? A: The sound transmission loss values from the ASTM E90 test are used to calculate the STC and OITC ratings in accordance with ASTM E413 and ASTM E1332 respectively. STC. 45 43 49 52 53 49 48 56 48 52 49 49 53 34 36 46 49 48 46 49 51 46 49 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. 4. 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. Nov 4, 2016 · There is no way to convert from OITC to STC (or vice versa), without access to the underlying TL data. The STC rating for a basic wood structure floor/ceiling is STC 40-43. . 030 1-1/2 1/4 41 32 2250 Series En la Tabla 2 se listan los valores de STC y Rw para diferentes configuraciones de vidrio, medidos en laboratorio. Sound Mitigation of Glass. between OITC and STC? OITC (Outside Inside Transmission Class) A single-number rating calculated in accordance with ASTM E 1332, using values of outdoor-indoor transmission loss. The OITC (Outside-Inside Transmlssion Class) rating is used to classify acoustic performance of glazing in exterior applications. What is a good OITC rating for windows? So, OITC is the ideal measurement for Peerless acoustic windows & doors. Nov 24, 2022 · Intertek – one of the largest industrial testing companies in the world – tests windows in its facilities for both STC and OITC ratings. 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. This sound rating increases to STC 42-45 with steel studs. STC 0 10 20 30 40 50 60 70 0 10 20 30 40 50 60 70 C STC. When it comes to soundproofing, two key ratings need to be considered: STC (Sound Transmission Class) and OITC (Outdoor-Indoor Transmission Class). values of insulating glass constructions. File Name: STC Ratings - Trinsic Due to continual CLASIFICACIONES GENÉRICAS STC Y OITC No debe utilizarse con fines de diseño o especificación. STC The OITC rating system was developed as a result of an increased demand for measuring the acoustical performance of exterior building partitions to reduce external sounds. NWTL140828-03 STC 40 Assembly Components Finish material 1/ STC. RW is similar but covers 100Hz to 3. Los datos e información están basados en muestras probadas en ambientes de laboratorio controlado, y no garantizan los mismos desempeños para cualquier muestra o aplicación particular. Nov 25, 2022 · 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). Sounds are then played at pre-determined frequencies to account for noises often heard inside May 1, 2017 · Common SNQ values include Sound Transmission Class (STC) and Outdoor-Indoor Transmission Class (OITC). In general, OITC may be most appropriate if low frequency noises are an issue, like airplanes and heavy traffic. Because it weighs low- to mid-frequency sounds more heavily, OITC is a more appropriate rating System for Windows. In 1961, STC was introduced as the method for comparing various wall, ceiling, floor, door, and window assemblies. It is used to provide an estimate of the sound insulation performance of a facade or building elements. 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. The higher the STC the better. Mar 5, 2021 · STC – Sound Transmission Classification. Source: STCratings. As previously explained, this means they have been tested in a laboratory for their sound transmission loss. STC OITC Test Date Number Operating Style Series Numbers Tested Size OA Glass 1 Glass 2 Acoustical Ratings - Tuscany I V400 updated 09. Most double-glazed windows will achieve an STC number in the mid- to high-20s. What Do STC Results Mean? The STC rating provides a single number that simplifies the complex spectrum of sound transmission performance into an easy-to-understand single-number metric. Assemblies will be organized by STC value ranging from an STC of 40 to an STC of 57. Sound Reduction Index (SRI) is defined in ISO-140 (2012). The final STC/OITC rating of the window assembly could vary because of the influence of the framing members and the What is STC and OITC? STC stands for "Sound Transmission Class," a measure of the extent to which sound is prevented from being transferred from one area to another. STC Ratings from 39 to 48; OITC Ratings from 34 to 44; These figures mean CitiQuiet windows can decrease exterior noise anywhere from 50% up to nearly 80% inside the home depending on precise configurations chosen. "Sound Transmission Class (STC)" and "Outdoor/Indoor Transmission Class (OITC)" ratings are for individual units based on independent tests and represent entire unit. 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 “1 dB”. [Click to enlarge any image] Definition of STC, Definition of SRI , Definition of OITC. OITC Ratings. STC ratings are the ONLY way to accurately compare various noise reduction products. The STC ratings allow accurate 'apple to apple' comparisons. STC is calculated by taking the Transmission Loss (TL) values tested at 16 standard frequencies over the range of 125 Hz to 4000 Hz and plotted on a graph. May 22, 2022 · Is OITC Better than STC? The short answer is ‘No’. *OITC is estimated based on this test. The latest editions of the standards shall be used in determining the STC and OITC ratings. STC covers the range 125 Hz to 4000 Hz, while R W covers 100 Hz to 3150 Hz. So both cover 16 one-third octave bands. MTC was developed to address shortcomings of STC and RW at low frequencies important for STC OITC Test Date Test Number Operating Style Series Numbers Tested Size OA Glass 1 Glass 2 Acoustical Ratings - Trinsic I V300 updated 04. STC stands for sound transmission classification. 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. An STC 34 brings the windows up to the level of most of the outside envelope of the home. STC OITC and STC are almost the same rating system except that OITC is geared for testing lower frequencies. Ask for our extensive test reports (over 40) using our window with 6 different primary window glass configurations. the STC or OITC rating means the higher the sound attenuation properties of the window. While both ratings measure a material’s ability to block sound, they differ in the type of noise they assess and their applications. No matter where you live, you’ve likely had the unpleasant experience of outside noise entering your home. An example of STC perception: +/- 3 STC change is just perceptible +/- 5 STC change is clearly audible +/- 10 STC change is twice as loud ; STC is calculated by looking at the difference in the difference is sound via decibel outside the window and inside the window. Sound Transmission Class (STC) rating system measures sound transmission loss between 125 Hz and 4000 Hz. This rating is common in residential The U. Tipo de producto de vidrio y espesor STC OITC Clasificación Clasificación Monolítico 3/32" 26 - 1/8" 29 - ¼” 31 29 ½” 36 33 Unidades de vidrio aislante sellado 1 /8" vidrio + ¼” aire+ 1 "vidrio 28 26 the STC or OITC rating means the higher the sound attenuation properties of the window. 12-113-11-R1 STC RANGE 36 - 45 Roof Membranes Unless otherwise indicated, all tests have been completed to be membrane Mar 23, 2017 · averaged to find the STC value. Professionals in the soundproofing business have depended on STC for much longer than they have OITC ratings. OITC. Glass size and glazing system will affect STC rating. 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. 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. Department of Housing and Urban Development (HUD) provides information on housing policies, programs, and resources. The OITC value is typically used to rate, evaluate, and select exterior glazing assemblies. 17. 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. Mar 30, 2023 · Also, an acceptable STC rating for walls may be different from the acceptable STC rating for floors, depending on whether the walls are shared by a neighbor, or a room is directly beneath a kitchen with heavy traffic. com Conclusion: A person cannot detect a change in loudness of +/- 1 dB (STC). • However, because the actual sound transmission loss can vary widely across the range, the STC value can often be misleading. In addition although the respective sound test procedures are similar, the way that the individual results are interpreted are dissimilar. Back to Top The STC (Sound Transmission Class) is a rating system for interior building partitions and viewing windows used to categorize acoustic performance. 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. When shopping for soundproof windows, there are a couple of factors to take into account when considering which rating, STC vs. The higher the STC value, the better a construction reduces the transmission of sound. 02-113-11-R1 Rainfall: G3302. OITC rates the transmission sound between outdoor spaces and indoor spaces in a structure. See full list on ngctestingservices. Here’s a quick guide to interpreting STC ratings: STC 25-30: Speech can be easily understood through the partition. • Certain products may excel at limiting high frequency noise, but lack the ability to reduce low frequency noise and vice versa. E413-87 in an acoustical wall. 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. How Sound Control Windows Are Rated: STC vs. The other measure is known as the Outdoor-Indoor Sep 14, 2021 · OITC is calculated by subtracting the logarithmic summation of the transmission loss values from the logarithmic summation of the A-weighted transportation noise reference spectrum stated in the calculation standard. It is also the most used soundproofing rating system. Whether it’s the neighbor out mowing their lawn first thing in the morning, the constant honking and screeching of cars on the road, or the roar of airplanes flying overhead, noise levels can have a serious impact on our health and well-being. STC/OITC:37 G3302. As with STC, the higher the rating, the better the sound-dampening performance. (see Table 5-15). The overall STC rating is an average of the STC ratings measured between 125 Hz and 4,000 Hz. Specifically, Phone: 888-815-9691. Let’s understand the difference. That being said, anything below an STC rating of 40 might garner comments about paper thin walls. Feb 22, 2024 · Differences between OITC and STC. Sound Transmission Class (STC) is defined in the ISO-140 standards series. A standard material will have an STC of between 20s (such as glass) and 30s (the average wall). Jan 11, 2025 · 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. Based on the NRC (Noise Reduction Coefficient) and square area of all room finishes. 0 pcf INS735. Isomax product requires 2 layers of 5/8" gypsum board to achieve the same 1 hour fire rating as the RSIC-1 clips on this system with only one layer of gypsum board on the clip side. STC Glazing. The STC rating indicates the ability for the PTAC to stop sound from transmitting from the outside to the inside. For windows, STC ratings range from 18 to 38. 06 m W* n 0 792 612 specify the STC or OITC that is required of the glazing system. STC •Average difference STC –OITC = 6. 4 %âãÏÓ 9 0 obj > endobj 11 0 obj > endobj 23 0 obj > endobj 29 0 obj >stream /Figure >BDC q 1 i . All laminate The enclosed STC and OITC data is for insulating glass constructions only. 501 re 306 396. When it comes to age, STC is much older than OITC. The STC and OITC ratings shall be calculated in accordance with ASTM E 413 and E 1332, respectively. Back to Top. NWTL140828-03 STC 40 Assembly Components Finish material 1/ Windows and doors can help block outside noises whether you live in the city or on a farm. U356 RESIC-1 vs Isomax STC and OITC. An STC rating is an instrument measurement of how much noise is stopped. What STC and OITC Ratings Do Renewal by Andersen® Replacement Windows Offer? OITC measures the ability of a product to reduce the overall noise of ground and air transportation. The final STC/OITC rating of the window assembly could vary because of the influence of the framing members and the How Does STC Differ From OITC? OITC stands for outside-indoor transmission class. In typical metal building construction the values for STC range from a low of about 20 to a high of 55. Resource Alert: Find OITC and STC ratings for roof-ceiling assemblies on pages 111–112 of The SoundBook. 15kHz and is used in Europe. A product with a high STC value, ranging from 50-60, indicates that loud speech is barely heard, if at all. This rating is given to materials that are tested over a range of frequencies, and are proven to block sound in some capacity. It must be remembered that the STC or OITC rating of a glass product does not represent the rating of the glazing system. You’d Dec 20, 2022 · The higher the STC rating, the better a material’s ability to block sound from travelling from one space to another. Configuración Rw STC OITC Espesor Nominal 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. In general, a barriers OITC rating is lower than its STC rating. Due to ongoing product changes, updated test results or new industry standards or requirements, this data may change over time. Whichever curve your graph most closely resembles corresponds with the barrier’s STC rating. Jan 11, 2025 · At JELD-WEN, for example, we offer a variety of dissimilar glass combinations on our Vinyl windows that carry up to an STC 34 rating. This data is accurate as of October 2018. STC OITC 80 100 125 160 200 250 315 400 500 630 800 1000 1250 1600 2000 2500 3150 4000 5000 For example, if the curve created by one of your walls most closely matches the standard STC 40 curve, your wall will be said to have an STC of 40. The same applies to soundproof windows with double laminated panes rated at an STC of 42; they drop to 33 on the OITC scale. The “Outdoor-Indoor Transmission Class” (OITC) rating system was developed in ASTM E 1332. The OITC rating represents transmission loss results from 80 to 4,000 Hz using a different mathematical equation than the STC rating. For example: Both the STC and Rw rating systems emphasize medium and higher frequency sounds as opposed to lower frequency sounds, so both are less appropriate for determining performance near highways, airports, or industrial sites. Testing shall be performed at laboratories that are accredited under the National Voluntary Laboratory Accreditation Program (NVLAP) STC EWR; OITC single hung; 2210 2211 2230 2230J 2270 picture window (slider frame) 2310 2311 2331 2331J 2370. ] An Apparent OITC rating can be assigned to specimens tested in the field and in the laboratory. Our secondary window STC ratings range from STC 48 to STC 57. For more information on the STC and OITC rating of Andersen products, please view our Andersen Performance How to calculate an STC or OITC rating; STC versus OITC. Following the guidance of ASTM E1332 (Standard Classification for Determination of Outdoor/Indoor Transmission Class), the OITC rating is calculated within the frequency STC and IIC Ratings of Truss Joist Floor Assemblies Containing GreenFiber INS735 Insulation Truss Height 16" 12" STC 53 54 IIC 56 53 Basic construction outline 16" Truss Joists, 24" oc, with 1/2" RC and 5/8" Type X Drywall below, and 3/4" T&G plywood and 3/4" 3310 gypcrete above and 3/8" padded carpet on top. 751 614 -426. The document discusses methods for calculating various acoustic ratings including STC, RW, MTC, and OITC. Consider that an average exterior wall of a stick-built home has an STC rating between 34 and 38. Oct 6, 2011 · If our windows have an STC of 35 but an OITC of 25 would they qualify? I don't think so, but I don't know how to interpret or relate the OITC to STC. iixro bwirua abh wrtf luolw gtx vmdh mfrhprd dlnbfdh jta rqzukq kxmdxwn nvid sbwqd mwi