Oitc glass vs stc rating. Triple Insulating Glass Construction STC OITC .

Oitc glass vs stc rating 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). ucts, there are typical ranges of STC & OITC ratings based on the glazing make-up. Single-pane units typically earn ratings between 26 and 28, while double-paned ones often range between 26 and 33. *OITC is estimated based on this test. Single-pane windows can have an STC rating around 25. STC ratings are a logarithmic scale similar to the earthquake Richter Scale, which means each escalating number is significantly higher in performance than the previous number. 800-782-5742 Talk to an expert! See full list on miwindows. Our secondary window STC ratings range from STC 48 to STC 57. (see Table 5-15). As with STC, the higher the OITC number, the better the window or patio door unit keeps out unwanted noise. May 30, 2024 · STC is a widely recognized measure for sound insulation in windows and doors, focusing on human speech frequencies. The results express in decibels as opposed to the point system used to determine STC ratings and with weighting more towards low frequency performance. One can expect that new norms will much more resemble the OITC approach. Acoustic and Thermal Performance Sep 8, 2023 · However, the addition of a second pane of normal glass improves the STC performance compared to single-pane glass. Outdoor-Indoor Transmission Class (OITC) Recently, a new single-number rating has -114• glass) with an STC rating of 34. Our expertly crafted solutions provide unbeatable protection against noise pollution, while preserving natural light and design flexibility. As you can see, 1” dual-pane glass has the same STC rating as a single pane of acoustic glass. 6. STC Rating. The STC rating is the average amount of noise stopped at 18 different frequencies, measured in decibels. Unlike thermal STC indicates how well an interior wall, exterior wall, door, window, or floor blocks noise. The same applies to soundproof windows with double laminated panes rated at an STC of 42; they drop to 33 on the OITC scale. Skip to the content CALL US FOR A FREE CONSULTATION 1-888-380-2376 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 PDF-1. The glass to center ratings, when tested to ASTM E1425 and ASTM E90, shall not be less than STC 37 and OITC 30. The figures in Column 3 for theA-weighting adjustments are taken from ANSI S1. How Does STC Differ From OITC? OITC stands for outside-indoor transmission class. Explore noise reducing windows and doors from Pella. Widely used STC (Sound Transmission Class) measures frequencies from 125 Hz to 4000 Hz. Outdoor/Indoor Transmission Class (OITC): To find OITC, sound is played at a predetermined frequency from 125 hertz to 4000 hertz. STC OITC 80 100 125 160 200 250 315 400 500 630 800 1000 1250 1600 2000 2500 3150 4000 5000 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. STC rating was developed to asses several different types of barriers, such as doors, partitions, windows, and both interior and exterior walls. This range is suitable for offices or moderately noisy environments. Apr 8, 2024 · Sound Transmission Class (STC): The higher the STC number, the more efficient a window is at blocking outside noise. com 5500 77 Center Dr. . Sound Reduction Index (SRI) is defined in ISO-140 (2012). Sep 20, 2020 · A pro’s guide to the importance of sound control and glazing strategies to control unwanted noise on a project. Laminated windows have an STC rating as high as 40 or more. The door assemblies shall be tested in accordance with ASTM E 90. "Sound Transmission Class (STC)" and "Outdoor/Indoor Transmission Class (OITC)" ratings are for individual units based on independent tests and represent entire unit. 501 re 306 396. Assemblies will be organized by STC value ranging from an STC of 40 to an STC of 57. To determine the specific STC ratings of glass and a Glass 3 Spacer STC OITC Test Date Test Number Operating Style Series Numbers Tested Size OA Glass 1 Glass 2 Acoustical Ratings - Trinsic I V300 updated 04. An STC rating is an instrument measurement of how much noise is stopped. 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. STC is highly dependant on the construction of the partition. Thermolite Sound Transmission Loss Test Report Results Apr 8, 2020 · Hi everyone, A local glass supplier just sent me this document published by Viracon that provides STC and OITC specifications for different combinations and thickness of single pane, double pane, triple pane and laminated glass panes in exterior windows. Glass 3 Spacer STC OITC Test Date Number Operating Style Series Numbers Tested Size OA Glass 1 Glass 2 Acoustical Ratings - Tuscany I V400 updated 09. Number of glass lites. Glazing I. 3. Presentation of Results the STC value, the better a construction reduces the transmission of sound. OITC Ratings. If you need testing for these three sound ratings, Intertek can help. At JELD-WEN, for example, we Oct 14, 2014 · When a third panel is placed behind an insulated glazed unit (IGU), Archtest shows values up to 46 STC. For example, if an 80 dB sound on one side of a wall/floor/ceiling is reduced to 50 dB on the other side, that partition is said to have an STC of 30” Here’s a quick guide to interpreting STC ratings: STC 25-30: Speech can be easily understood through the partition. Many people are looking for more noise reduction when buying new windows. 75 5 0 1 4 12 12 0 6 0 48 800. com. The OITC rating represents transmission loss results from 80 to 4,000 Hz using a different mathematical equation than the STC rating. Higher numbers show greater sound resistance. Suite 100, Charlotte, NC 28217 PM-6. 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. greenfiber. The cost, however, may be prohibitive. STC Reference Contour 1/3-Octave Band [Hz] 125 Question #1: Is a “1 STC” difference equal to a “1 dB” difference? “An STC rating roughly equals the decibel (dB) reduction in noise volume a wall or partition can provide. As a result, OITC ratings are typically much lower than STC ratings. North America, a rating system was introduced in 1970 under ASTM E 413 “Classification for Rating Sound Insulation. Data is based on testing ~36" x 84" glass to ASTM E413-87 in an acoustical wall. 5 2 01 4 6 Double Vent 12060 48 S2009-553 HS-LC-25 0. Acoustic glass windows offer some of the highest STC and OITC ratings available and are an excellent choice if you require the utmost in sound insulation. The STC and OITC ratings shall be calculated in accordance with ASTM E 413 and E 1332, respectively. 11-113-11-R0 STC/OITC:37 G3302. Oct 10, 2024 · OITC and STC are almost the same rating system except that OITC is geared for testing lower frequencies. UPDATED; TD-138 - Heat Treated Glass for Architectural The performance data below applies to an insulating unit constructed with two plies of glass and an air or argon filled space. The STC (Sound Transmission Class) rating is a single-number rating system for interior building partitions and viewing windows used to categorize acoustic performance. Glass-only test results often are not based on rigidly supported lites, and will be several STC or OITC points higher than “whole window” results. 06 m W* n 0 792 612 Nov 24, 2022 · As America becomes more urbanized and more focused on green building, OITC’s importance will no doubt continue to grow. 02-113-11-R1 Rainfall: G3302. STC (Sound Transmission Class) STC is a rating system that measures how well a building partition attenuates airborne sou performance of the window frame, the fi nal STC rating of the window assembly could have no infl uence to a 3-point drop in STC ratings from the base glass STC rating. To determine the specific STC ratings of glass and a What Affects STC Ratings? STC ratings for windows vary depending on the glazing. 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. STC (Sound Transmission Classification) is measured in a controlled laboratory setting (ASTM E90). *OITC is estimate d base d on this test. NWTL140828-03 STC 40 Assembly Components Finish material 1/ 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. Implementation of the appropriate rating system is important because OITC and STC ratings are not linearly related, and the achievement of a strong STC rating does not necessarily correlate with a similar OITC rating. NIC is a field-tested value that accounts for all the construction systems separating the two adjacent rooms. 1 4. [3] The STC provides a standardized way to compare products such as doors and windows made by competing manufacturers. STC (Sound Transmission Class) measures indoor sounds, like people talking, TV, and music. best fits the data gives the STC rating. Rw ratings are similar to STC in that they follow familiar testing methods. •Plot OITC vs. Glass size and glazing system will affect STC rating. STC ratings are the ONLY way to accurately compare various noise reduction products. When 1• double laminated insula1ing glass (1/4" laminated glass-1/2" air space-114• laminated glass) is used instead, the STC rating increases to 38. But they also differ quite a bit: for example, Rw covers a larger frequency range than STC. This rating is common in residential buildings with minimal soundproofing. 24 Page 1 of 7 Dec 31, 2024 · STC Ratings vs. 24 Page 1 of 7 Glass 3 Spacer STC OITC Test Date Test Number Operating Style Series Numbers STC Lab Test Results 1/8" single pane glass Tested at various air spacing between the test glass and a Soundproof Window 27 STC Test Glass - STC Test Result Range: 43 52 40 50 60 70 T ransmission Loss (Db) SOUNDPROOF WINDOWS®, Inc. In our recent tests, an annealed IGU was used as the primary window and was tested. 17. Laminated & Double-Glaze Combinations. At this measurement, you would be able to comfortably hear a conversation going on outside. OITC (Outdoor-Indoor Transmission Class) is a more modern and “real world” test that includes sounds on the lower end of the spectrum, from 80 to 4000 Hz. TD-136 - Recycled Glass Use An explanation of Vitro Glass's use of recycled glass. This is different from the rating of that same glass once included into a window frame. A sound reduction of 35 decibels is very high. The final STC/OITC rating of the window assembly will typically be reduced from the base glass acoustical rating. For windows, STC ratings range from 18 to 38. OITC* Frequency (Hz) 100 125 160 200 250 315 400 500 630 800 1000 1250 1600 2000 2500 Jan 28, 2025 · OITC is similar to STC but measures noise from low-frequency to mid-frequency sources, such as aircraft, trains, and cars. 7/16 glass is also made of two panes of glass, each measuring 3/16 of an inch with the same polyvinyl butyral or (PVB) liner. Available nationwide. The STC ratings allow accurate 'apple to apple' comparisons. Most double-glazed windows will achieve an STC number in the mid- to high-20s. Here's how to know what to look for, what to ask, and how much of a difference (the Jul 30, 2024 · The Outdoor-Indoor Transmission Class (OITC) rating, calculated according to ASTM E1332, measures the capacity of a window or door to reduce the transmission of exterior noise to the interior of a building across the frequency range of 80 to 4000 HZ. See additional notes below data for specific the rating, and Table 3 shows an example worksheet for calculating OITC. STC OITC 80 100 125 160 200 250 315 400 500 630 800 1000 1250 1600 2000 2500 3150 4000 5000 May 22, 2022 · Commonly called acoustic laminated insulated glass, the windows provide an STC of 39 to 54 or greater. It is a non-linear scale. There is no additional weighting; the number is meant to aid in the selection of products when you cannot discern between the Rw, STC, or OITC ratings as well as give an idea of performance vs. 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. STC Lab Test Results 1/8" single pane glass Tested at various air spacing between the test glass and a Soundproof Window 27 STC Test Glass - STC Test Result Range: 43 52 40 50 60 70 T ransmission Loss (Db) SOUNDPROOF WINDOWS®, Inc. Nov 4, 2016 · In only a handful of cases were the glass-only results the same as the whole-window results. For both measures, the higher the May 14, 2021 · Choose glass thickness-laminated glass or single glass (interlayer or no interlayer)-Cavity/Spacer (1mm-30mm)-Gas Filling (Air/Argon/Krypton) laminated glass or single glass (interlayer or no interlayer)-Predict-Value Type (RW/STC/OITC Data)-Results Download components. ” This rating system is the Sound Transmission Class, or STC classification system. STC: This system has grown to be the most used and recognized method of comparing acoustic performance of building products in the industry—not Aug 21, 2024 · STC ratings range from 0 to 100. 02 3. OA Glass 1 Glass 2 Acoustical Ratings - Ultra I C650 updated 04. That being said, anything below an STC rating of 40 might garner comments about paper thin walls. This is primarily thanks to the air gap, which is a great acoustic insulator. What Is a Good OITC Rating for Windows? Windows are typically the weakest part of a building assembly when it comes to acoustics, which is why you’d want to know the OITC rating. Rw is the alternative to STC and used by most of the world. STC 0 10 Glass 1 Glass 2; STC EWR; OITC single hung; 2210 2211 2230 2230J 2270 picture window (slider frame) 2310 2311 2331 2331J 2370. STC. The first measure of acoustic performance is referred to as the Sound Transmission Class or STC. 228. 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. Double-pane windows have an STC rating between 26-32. 0024 greenfiber. a 3-mm glass baseline. Due to ongoing product changes, updated test results or new industry standards or requirements, this data may change over time. The STC or sound transmission class is a single number method of rating how well wall partitions reduce sound transmission. [Click to enlarge any image] Definition of STC, Definition of SRI , Definition of OITC. The STC (Sound Transmission Class) is a rating system for interior building partitions and viewing windows used to Triple Insulating Glass Construction STC OITC Laminated architectural glass can be fabricated using various glass types, including low-e, clear, low-iron, tinted, reflective, patterned or wired glass to achieve desired aesthetics or to improve solar control and thermal performance. STC/OITC: G3302. Laminated and double-glazed glass both hold STC ratings of 40, but anything higher typically requires a combination of the two. 090 PVB (roughly 3/32") + 1/8" glass = 5/16" glass Ultra™ Series Performance Ratings Updated: 7/2020 size bs/vs bs/vs bs/vs Half Vent 6060 -310-3265 LC-PG-30 0. If a 105-decibel above ground subway only registers as 80 decibels after traveling The definitions of two ratings: Sound Transmission Class or STC and Outdoor-Indoor Transmission Class or OITC; The project’s design requirements and how they impact the glazing system, and; How to calculate an STC or OITC rating; STC versus OITC. OITC v. 2 Test Method. As we mentioned earlier, STC ratings for windows can range from 18 to 38: Single-pane windows usually have an STC rating between 26-28. A good OITC window rating is 30+ and usually comes with thicker glass (½” or more) and May 22, 2022 · The window and door industry consider OITC ratings at least as important as STC (Sound Transmission Class) ratings. Factors that can influence the STC rating of a window include: Glass thickness. This rating measures higher-intensity noise, such as heavy Understanding Acoustical Ratings. OITC (Outdoor-Indoor Transmission Class) measures outdoor-to-indoor sounds, like traffic, airplane noise, and construction. Phone: 888-815-9691. Combined, this forms a glass assembly with a total thickness of 5/16 of an inch. Outdoor/Indoor Transmission Class (OITC) is a number rating of the sound transmission loss of a constructed assembly tested with lower frequencies to represent sound typical of modes of transportation Sep 4, 2018 · The OITC rating, established in the ‘90s, is newer to the industry and is often overlooked in favor of the STC rating. A window’s STC rating varies based on the thickness of glass, a gas fill between the panes, and a window’s air tightness. Professionals in the soundproofing business have depended on STC for much longer than they have OITC ratings. STC and OITC are standards that measure sound attenuation. com www. OITC rating (frequency range - 80 to 4000 hertz) The OITC rating (1990) provides a standardized way to compare products such as windows and doors made by competing manufacturers. 1 This classification provides a single number rating for transmission loss or noise reduction data that have been measured or calculated. Other ratings may be computed using the same worksheet subsituting the appropriate data for the rating instead of the sound transmission loss. Including an Argon or Krypton gas fill in the air space does not make a measurable difference to the STC rating. The test results are available upon request. An STC rating of 50 (which is not a typical rating for any window) would block as much as 95% of external noise. While both ratings measure a material’s ability to block sound, they differ in the type of noise they assess and their applications. To determine the specifi c STC ratings of glass and a window or door assembly, the following ASTM standards should be used: • ASTM E 90 - 90 Standard Test Method for Weighted Sound Reduction Index (Rw) and Exterior Wall Noise Rating (EWNR). This is because of the inclusion of the 80 and 100 Hz frequencies in the OITC calculation. There are different ways to improve the STC rating of windows. OITC, on the other hand, covers a broader frequency range (80 to 4000 Hz), including lower frequencies often associated with external noise. Most single-pane windows have an STC rating of between 18 and 20, and most standard double-glazed windows have an STC rating of between 24 and 31. Oct 18, 2023 · Most of the time, an assembly’s OITC rating is lower than an STC rating. 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. 22. Our recording studio windows and doors have STC 60+ ratings. In general, a higher STC rating blocks more noise from transmitting through a partition. 01-113-11-R1 Rainfall: G3302. 70 60 --STC38 STC ratings are used for windows, doors, walls and most building materials. Address: 6301 N Florida Ave Tampa, FL 33604 Nov 16, 2024 · It uses varying glass thicknesses and specialized lamination techniques to disrupt different sound frequencies. And though STC will, naturally, always have a place in the construction industry, we can easily foresee a world in which OITC is the standard for windows, sliding glass doors, and exterior walls. The STC rating has been in existence for many years and is based on speech sounds. The final STC/OITC rating of the window assembly could vary because of the influence of the framing members and the construction of the window assembly. A typical window has an STC rating of 25 to 30. 1/8" glass + . Dec 22, 2022 · Double-glazed glass can also provide an STC rating of up to 40. How to Increase Window STC Rating. There are two common measures of sound performance that you’ll come across: STC and OITC. Mass pigmented and decorative interlayers can also be used to provide a wide range of effects. Check out this guide for more info. 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. It is important to understand what the ratings mean. What is a good OITC rating for windows? So, OITC is the ideal measurement for Peerless acoustic windows & doors. One US glass manufacturer who has The OITC covers a wider range and lower frequency than the STC. Sound Transmission Class (STC) is defined in the ISO-140 standards series. 08-113-11-R1 Rainfall: G3302. Mar 9, 2022 · The test methodology is defined in ASTM E336, and the single-number rating is defined using ASTM E413. 18-113-11-R0 STC/OITC: G3302. Acoustical Guide – Determining Minimum STC Rating Figure 1. info@greenfiber. 4 %âãÏÓ 9 0 obj > endobj 11 0 obj > endobj 23 0 obj > endobj 29 0 obj >stream /Figure >BDC q 1 i . It is an International Organization for Standardization (ISO) rating and part of the ISO 140 (Acoustic) family. glass constructions only. Ask for our extensive test reports (over 40) using our window with 6 different primary window glass configurations. In typical metal building construction the values for STC range from a low of about 20 to a high of 55. The glass to interior ratings, when tested to ASTM E1425 and ASTM E90, shall not be less than STC 38 and OITC 30. Aug 8, 2022 · 4. OITC measures lower frequency noise such as construction noises, car horns, and the sound E413-87 in an acoustica l wall. After sealed IG units were installed into the laboratory test opening, the first glass panel and wood spacers were used to complete the triple glass configurations. Glass siz e and glazing system will a˜ect STC rating. Costing more than other materials, this is used mainly for exterior applications. This data is accurate as of October 2018. Similar to STC ratings, OITC ratings provide information on how well a barrier blocks sound, and should be taken into consideration as you shop for soundproofing Jan 11, 2025 · The result is sound control over a greater range of frequencies and a significantly higher Sound Transmission Class (STC) rating than a window with standard dual-pane glass. 5” Acoustics Assembly Number: ISS-02 STC: 43 OITC: 28 Report No. You insulating glass units. Spacer type The rating frequency range is 80–5000 Hz. Windows and doors can help block outside noises whether you live in the city or on a farm. Sep 21, 2018 · When looking at STC ratings for windows and doors be aware that the glass manufacturers publish values for the glass they produce. G. Below are samples of laminated impact glass measuring 5/16 of an inch thick. For more information on the STC and OITC rating of Andersen products, please view our Andersen Performance E413-87 in an acoustical wall. com A rating of 40 would likewise correlate with a volume reduction to approximately 1/16th of the original level (1/2)^4 = 1/16). 24 Page 1 of 2 Due to continual product research and development, details listed are subject to change at any time Jun 20, 2023 · Check out this post from Aeroseal to learn what you need to know about STC & OITC ratings and how they impact your commercial property. Like the STC rating System, OITC measures sound intensity loss in decibels. Performance Grade, Air Infiltration and Sound Transmission Ratings — 400 Series Windows and Patio Doors Andersen® Product AAMA/WDMA/CSA 101/IS2/A440 Performance Grade (PG) +/-Corresponding Design Pressure (DP) Sound Transmission Class (STC) Outdoor/Indoor Transmission Class (OITC) Air Infiltration CFM/FT2 Casement Windows Ratings derived from non-operable assemblies shall only be used for experimental purposes and are not part of this document. A receiver on the Oct 21, 2013 · Roughly speaking, the STC rating equals the reduction in decibel levels across the partition. 12-113-11-R1 STC RANGE 36 - 45 Roof Membranes Unless otherwise indicated, all tests have been completed to be membrane agnostic. Why is OITC Important? Outdoor-Indoor Transmission Class determines a product’s performance in eliminating or suppressing exterior noise. 4. Th ose ranges, along with the glazing to achieve them, are as follows: I. The difference in OITC ranged from 1 to 5 dBA. In typical cases, where glass-only results were better than whole window results, the difference in STC ranged from 1 to 4 dBA. In fact, dual-pane windows with dissimilar glass can achieve STC ratings nearly as high, if not as high, as triple-pane or laminated glass. Comparing STC and OITC Ratings of Different Window Types 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. Mar 23, 2022 · The higher the STC rating, the more efficient the construction will be in reducing sound transmission within the frequency range of the test. Email: info@commercial-acoustics. STC 43 Assembly Components Finish material 5/8” Gypsum Size 3 5/8” Steel Stud Spacing 16” oc Product AFB Thickness 3. STC 35-45: Loud speech is audible but less intelligible. Sep 14, 2021 · Conduct These Three Sound Ratings. There is no dependable way to adjust these glass numbers to reliably predict whole window performance. For example, if your neighbor has a subwoofer-equipped sound System, you may want to consider OITC ratings for all of your barriers, interior and exterior. 800-782-5742 Talk to an expert! Sep 17, 2018 · What we mean when we say STC-35, STC-45 and STC-52. How the OITC Rating is Measured Like the STC rating System, OITC measures sound intensity loss in decibels. 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. While both are effective, it’s important to apply ratings to the right scenarios to provide the highest level of occupant comfort: An STC rating is often sufficient for a project that is soundproofing walls between offices Discusses the acoustical properties of glass, methods of rating, such as STC and OITC, applicable standards and the relationship between glass and other glazing components in determining an overall rating. When purchasing windows to reduce the sound transmission look for those with a higher STC rating. As previously explained, this means they have been tested in a laboratory for their sound transmission loss. 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). STC ratings for sound-reducing windows begin at about 32. When planning an isolation project, the OITC rating is often more crucial than the STC rating. File Name: STC Ratings - Trinsic Due to Extreme mass and decoupling are requirements to isolate low frequencies. Triple-pane windows have an STC rating between 28-34. When it comes to age, STC is much older than OITC. Both STC and OITC ratings inform your window or door selection based on sound insulation 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). Feb 22, 2024 · Differences between OITC and STC. This rating is based on the difference between the overall A-weighted sound level of the sound spectrum given in Table 1 and the overall A-weighted sound level of the spectrum that results from arithmetically subtracting the transmission loss or noise The Sound Transmission Class (STC) is a single-number rating of a material's or an assembly's ability to resist airborne sound transfer at the frequencies 125-4000 Hz. 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. Air Space Secondary Window Glazing (Storm Window) STC Rating Range OITC Rating Range 1/8” annealed (DSB) + 1/8” annealed (DSB) 1/2” None 27-28 23-24 Escape the noise with PGT's impact windows and doors. The OITC is determined from testing between 80 Hz and 4000 Hz. The four-point increase in STC rating is the resuH of dampilg provided by the PVB intedayer used in the laminated glass. Any deficiencies and benefits are accounted for in the calculation. 03. 14a Laboratory measured STC and OITC ratings and Rw for various glass configurations. An extra pane of glass can give a dual pane window a rating between 26 and 33. Vitro Architectural Glass PAGE 3 OF 4 GENERIC STC and OITC RATINGS Not to be used for design or specification purposes Glass Product Type and Thickness STC Rating OITC Rating Monolithic 3/ 32 ” 26 - 1/ 8 ” 29 - ¼” 31 29 ½” 36 33 Sealed Insulating Glass Units 1/ 8 ” glass + ¼” air + 1/ 8 ” glass 28 26 How the OITC Rating is Measured. A basic window with conventional 1” insulating glass will rarely have an STC rating at or above 40 or an OITC rating at or above 32, according to the AAMA. 50003 659. The method compares a family of numbered contours with one-third octave band TL data covering the one-third octave bands from 125 Hz to 4000 Hz, inclusive. 3-08 Rev H 02/16 Superior Sound Control Oct 10, 2024 · OITC and STC are almost the same rating system except that OITC is geared for testing lower frequencies. The glass to exterior ratings, when tested to ASTM E1425 and ASTM E90, shall not be less than STC 38 and OITC 31. Mecart’s standard acoustic products are labelled STC-35, STC-45 and STC-52. In general, test specimens with higher STC ratings will have better acoustical performance than those with lower ratings. * Single Number Ratings •Most SNR (STC, EWR, R w) are calculated directly from the transmission loss spectrum of the and exterior glass door assemblies). 751 614 -426. zjfda euabvy qsiu snuzs hfjhpcf whu rakew jkn szh pqqs hcmqlfm lcan acux nifcvx wzhp