Stc and oitc ratings. The Unit’s Loudness Aug 8, 2022 · 4.

Stc and oitc ratings They are logarithmic values and cannot simply be added. 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 E413-87 in an acoustical wall. The STC rating indicates the STC EWR; OITC single hung; 2210 2211 2230 2230J 2270 picture window (slider frame) 2310 2311 STC Ratings - Trinsic Due to continual product research and Sound Transmission Class (STC) rates how much sound is blocked from going through a product. 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 rating of 40 would likewise correlate with a volume reduction to approximately 1/16th of the original level (1/2)^4 = 1/16). Calculated by using the sound transmission loss values in the 80 to 4000 Hz range as measured in accordance with ASTM E-90(09). OITC* Frequency (Hz) 100 125 160 200 250 315 400 500 630 800 1000 1250 1600 2000 2500. 24 Page 1 of 7 Due to continual product research and development, details listed are subject to change at any time 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. 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 or sound transmission class is a single number method of rating how well wall partitions reduce sound transmission. Widely used STC (Sound Transmission Class) measures frequencies from 125 Hz to 4000 Hz. Wall Assembly Acoustical Testing Results Nov 24, 2022 · Because OITC measures how well sound is blocked from the outside, it’s actually a superior rating system to STC when considering a window’s acoustical performance. The STC ratings allow accurate 'apple to apple' comparisons. 17. 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. OITC is a newer rating system developed specifically for measuring sound transmission of low- and mid-frequency noises through exterior walls. Sound Transmission Class (or STC) is an integer rating of how well a building partition attenuates airborne 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. 24 Page 1 of 7 Due to continual product research and development, details listed are subject to change at any time Phone: 888-815-9691. J2247-13-303-11-R0 Insulation Included 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. [3] The STC provides a standardized way to compare products such as doors and windows made by competing manufacturers. The TMS 302 Sound Standard provides minimum requirements for rating masonry walls for sound transmission class (STC) and outdoor-indoor transmission class (OITC) based on testing calibrated calculation procedures. 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 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. How are STC and OITC Measured? A: Based on our experience at the Architectural Testing Acoustical Laboratory, an OITC rating of 32 or STC rating of 40 is very difficult to achieve on a window with conventional 1" insulating glass. UPDATED; TD-138 - Heat Treated Glass for Architectural Source: STCratings. The STC rating has been in existence for many years and is based on speech sounds. E413-87 in an acoustica l wall. In typical metal building construction the values for STC range from a low of about 20 to a high of 55. STC Rating: The new GE Zoneline has an STC rating of 29. For example, if your neighbor has a sub woofer-equipped sound System, you may want to consider OITC ratings for all of your barriers, interior and exterior. This rating is common in residential buildings with minimal soundproofing. 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. The glass to center ratings, when tested to ASTM E1425 and ASTM E90, shall not be less than STC 37 and OITC 30. Fiberglass bands from 125 Hz to 4000 Hz. Mar 20, 2019 · It documents the ratings for sound transmission class (STC) and outdoor-indoor transmission class (OITC) on standard metal building ceiling and wall assemblies. transmission, an OITC rating is designed to account for sound outdoor sounds which consists of frequencies lower than an STC rating. Pim Foam or Dura**** OITC Test Date Test Number Intercept or Cardinal horizontal slider 6110 6111 6130 6130J 6170 size tested transmission, an OITC rating is designed to account for sound transmission from typical outdoor sounds which consists of frequencies lower than an STC rating. GE Zoneline has an OITC rating of 21. Address: 6301 N Florida Ave Tampa, FL 33604 Type STC OITC: Panel Doors: 29 27: Doors with Glass: 30 28: Doors with Mirror : 34 31 Type STC OITC: Fir 6-Panel: actual rating could vary. Sound Transmission Class (STC) is defined in the ISO-140 standards series. 22. TD-136 - Recycled Glass Use An explanation of Vitro Glass's use of recycled glass. Double-hung windows are not available with triple-pane glass. This rating is most appropriate for comparing performance of interior partitions to be used between rooms where there is not strong low-frequency sound. Outdoor Indoor Transmission Class (OITC) Sep 21, 2018 · The OITC rating is used to measure the sound transfer between outdoor and indoor spaces. The long answer is ‘In some cases’. OITC. When it comes to soundproofing, two key ratings need to be considered: STC (Sound Transmission Class) and OITC (Outdoor-Indoor Transmission Class). The STC and OITC ratings shall be calculated in accordance with ASTM E 413 and E 1332, respectively. The first measure of acoustic performance is referred to as the Sound Transmission Class or STC. If you need testing for these three sound ratings, Intertek can help. 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. Lepage offers a variety of acoustic glass with high ratings. Plastpro Doors STC and OITC Rating specify the STC or OITC that is required of the glazing system. The results express in decibels as opposed to the point system used to determine STC ratings and with weighting more towards low frequency performance. “Sound reduction is becoming increasingly important for many different types of buildings, such as schools and religious facilities,” observed Tony Bouquot, MBMA’s general manager. STC (Sound Transmission Class) STC is a rating system that measures how well a building material or assembly can reduce sound transmission. Both STC and OITC ratings inform your window or door selection based on sound insulation Acoustical Guide – Determining Minimum STC Rating Figure 1. To determine the specific STC ratings of glass and a OITC (Outdoor-Indoor Transmission Class) measures outdoor-to-indoor sounds, like traffic, airplane noise, and construction. 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 higher OITC demonstrates a door’s increased ability to prevent low-frequency sounds from entering the home. OITC Rating The Outdoor-Indoor Transmission Class (OITC) is calculated by subtracting the logarithmic 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. For both STC and OITC ratings, the higher the number the better the sound Buildings exposed to a noise level of 65 dB L eq-1-hr during any hour of operation shall have building, addition or alteration exterior wall and roof-ceiling assemblies exposed to the noise source meeting a composite STC rating of at least 45 (or OITC 35), with exterior windows of a minimum STC of 40 (or OITC 30). “Windows might have an excellent STC rating, but without a high OITC rating, low-frequency sounds can be intrusive,’’ Merck said. 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. Due to ongoing product changes, updated test results or new industry standards or requirements, this data may change over time. S. 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. Rw ratings are similar to STC in that they follow familiar testing methods. 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. You includes both STC and OITC ratings for steel and wood stud walls, considering both interior and exterior assemblies. Archtest results typically show IGUs in the 20s and 30s range the STC value, the better a construction reduces the transmission of sound. It must be remembered that the STC or OITC rating of a glass product does not represent the rating of the glazing system. This rating measures higher-intensity noise, such as heavy STC and OITC are standards that measure sound attenuation. Outdoor-Indoor Transmission Class (OITC) is a single-number rating system for acoustical OITC measures the ability of a product to reduce the overall noise of ground and air transportation. STC ratings for sound-reducing windows begin at about 32. * * [The data and information set forth are based on samples tested and are not guaranteed for all samples or applications. "Sound Transmission Class (STC)" and "Outdoor/Indoor Transmission Class (OITC)" ratings are for individual units based on independent tests and represent entire unit. OITC Ratings. The glass to interior ratings, when tested to ASTM E1425 and ASTM E90, shall not be less than STC 38 and OITC 30. Nov 16, 2024 · It uses varying glass thicknesses and specialized lamination techniques to disrupt different sound frequencies. The OITC rating is never greater than the STC and can be as much as 17 points less than the STC for some assemblies. 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. However, since its invention is relatively new, having been created in 1990, it’s still not used as widely as the STC, which was developed in 1961. See full list on ngctestingservices. Glass siz e and glazing system will a˜ect STC rating. 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). 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”. 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. J2247-13-303-11-R0 Insulation Included Sep 14, 2021 · Conduct These Three Sound Ratings. “Windows with a high STC rating typically have the same OITC rating as windows with a lesser STC rating, which can be a bit misleading. Because most external noise is low-frequency, such as street traffic, construction, and low-flying planes, this is crucial. 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. 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. Rw is the alternative to STC and used by most of the world. Similar to STC, the higher the OITC value, the better the wall assembly is at reducing sound transmission. *OITC is estimate d base d on this test. If you have an STC 33 wall and decide to add another sheet of drywall with an STC of 20 you do not get a finished wall with an STC of 53. Below is a brief description of each rating system. The OITC is the preferred method of comparison of façade elements including roofs for blockage of exterior sounds. STC/OITC:37 G3302. It is also the most used soundproofing rating system. As with STC ratings, the higher the OITC number, the more sound resistant the product is. For both measures, the higher the number the better. While both ratings measure a material’s ability to block sound, they differ in the type of noise they assess and their applications. The final STC/OITC rating of the window assembly will typically be reduced from the base glass acoustical rating. *OITC is estimated based on this test. STC Reference Contour 1/3-Octave Band [Hz] 125 Topics covered include reference standards, definitions and notations, materials, construction, and methods to STC and OITC rating for concrete masonry and clay masonry assemblies. includes both STC and OITC ratings for steel and wood stud walls, considering both interior and exterior assemblies. Sound Transmission Loss (dB) 43 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. 2 This classification requires data in one-third octave bands from 80 to 4000 Hz of sound transmission loss (TL) for outdoor-indoor transmission class (OITC), outdoor-indoor noise reduction (OINR(θ)) for outdoor-indoor noise isolation class (OINIC(θ)), or other data based on the rating definition for other ratings based on this classification. 03. How Does STC Differ From OITC? OITC stands for outside-indoor transmission class. STC 35-45: Loud speech is audible but less intelligible. One can expect that new norms will much more resemble the OITC approach. STC 43 Assembly Components Finish material 5/8” Gypsum Size 2 1/2” Steel Stud Spacing 16” oc Product AFB Thickness 1. Caution: You cannot add STC ratings. The latest editions of the standards shall be used in determining the STC and OITC ratings. STC OITC Test Date Number Operating Style Series Numbers Tested Size OA Glass 1 Glass 2 Acoustical Ratings - Tuscany I V400 updated 09. Outdoor-Indoor Transmission Class (OITC) rates how well a barrier blocks sound, with an emphasis on low-frequency noises such as bass-heavy music or a plane flying overhead. Performance documents for altitude limits, NFRC ratings, center of glass, joining window load table, air infiltration, and more. The STC and OITC rating measures a window’s ability to block sound transmission. The two most common ratings for sound transmission loss are Sound Transmission Class (STC) and Outdoor Indoor Transmission Class (OITC). 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. For windows, STC ratings range from 18 to 38. The STC and OITC ratings have been calculated according to ASTM E413 and ASTM E1332. Outdoor-Indoor Transmission Class (OITC) Recently, a new single-number rating has The two rating systems used to measure the acoustical performance of windows and doors are OITC (Outdoor Indoor Transmission Class) and the STC (Sound Transmission Class). 14 − 10log 10 å f 10((L f-TL f +A f) / 10) Where: What Affects STC Ratings? STC ratings for windows vary depending on the glazing. Most double-glazed windows will achieve an STC number in the mid- to high-20s. Reduction in sound based on OITC ratings of Pella Lifestyle Series windows with respective performance package compared to a single-pane wood or vinyl window with an OITC of 19. 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). TMS 302-18 is adopted by reference in the 2021 International Building Code. The Unit’s Loudness Aug 8, 2022 · 4. A receiver on the Apr 8, 2024 · Sound Transmission Class (STC): The higher the STC number, the more efficient a window is at blocking outside noise. Please see the reverse side for a comparison of how our cellulose and 4-inch Sound Control Batts perform in Feb 22, 2024 · However, even with OITC being the newer creation, the STC rating system is still the preferred rating method among professionals in soundproofing. com 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). Let’s understand the difference. It is an International Organization for Standardization (ISO) rating and part of the ISO 140 (Acoustic) family. Professionals use the OITC rating System less frequently than the STC rating System. Confirm ratings for STC ratings are used for windows, doors, walls and most building materials. This range is suitable for offices or moderately noisy environments. com. 2. Examples would be a 100 Series window Oct 14, 2014 · In the case of both STC and OITC ratings, a higher the rating, the better as it indicates that less noise is detectable. See additional notes below data for specific This disparity is due to the fact that, when compared to STC, OITC gives more weight to lower frequencies. But they also differ quite a bit: for example, Rw covers a larger frequency range than STC. Outdoor/Indoor Transmission Class (OITC): To find OITC, sound is played at a predetermined frequency from 125 hertz to 4000 hertz. It uses a specific decibel (Db) range (80 Hz to 4000 Hz) which makes it a better measure for low sound frequencies such as road noise. Desired Acoustic Value Simply type into an acoustic value we need, the system list all the matched compositions. The maximum deficiency at any one frequency must not exceed 8. 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. STC ratings are the ONLY way to accurately compare various noise reduction products. While not as well known as STC, OITC is a more appropriate measure when comparing the true sound control performance of a window. Comparing STC and OITC Ratings of Different Window Types Product Type Model IG Glass Type Sound Transmission Class (STC) Outdoor/Indoor Transmission Class (OITC) SS 25 21 DS 26 21 TS/DS (5mm/3mm) 32 27 Laminated 32 28 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 STC Rating To obtain the Sound Transmission Class (STC), read the TL of the contour curve at 500 Hz. A typical dual-pane window has an STC rating of 25-30. Glass size and glazing system will affect STC rating. Wall Assembly Acoustical Testing Results. The latest editions of the stan-. Email: info@commercial-acoustics. Oct 16, 2023 · acoustical ratings-->--> X 32 29 04/12/23 TL23-119 acoustical ratings not available for this glass combination glass combination X--> X 30 27 04/12/23--> X 34 29 12/14/22 OITC Test Date Test Number Intercept or Cardinal horizontal slider 6110 6111 6130 6130J 6170 size tested net 59" x 47" STC 29-34 X X <--32 Operating Style Series Numbers Glass Single Number Ratings •Most SNR (STC, EWR, R w) are calculated directly from the transmission loss spectrum of the assembly. It is the average of 16 frequency test points. What is a good OITC rating for windows? So, OITC is the ideal measurement for Peerless acoustic windows & doors. The frequency content of many common exterior sounds closely resembles that used for the OITC STC OITC Test Date Test Number Operating Style Series Numbers Tested Size OA Glass 1 Glass 2 Acoustical Ratings - Ultra I C650 updated 04. STC is the most-commonly speci˝ed measure of acoustical performance - higher is better. Our products have been tested to help contribute to quieter indoor environments—ideal for living, working and relaxing—regardless of exterior noise. Today, the OITC rating System is used to assess any barrier meant to block out low frequency sound. Testing shall be performed at laboratories that are accredited under the National Voluntary Laboratory Accreditation Program (NVLAP) Jan 18, 2022 · STC Ratings Updated : 01/18/2022 by K. 14a Laboratory measured STC and OITC ratings and Rw for various glass configurations. The sum of the deficiencies below the contour curve must not exceed 32. 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. 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, using a logarithmic summation of individual third OB TL measurements: OITC = 100. OITC, on the other hand, covers a broader frequency range (80 to 4000 Hz), including lower frequencies often associated with external noise. Ideal for airport applications or any building in cities or near highways. That being said, anything below an STC rating of 40 might garner comments about paper thin walls. ] Here’s a quick guide to interpreting STC ratings: STC 25-30: Speech can be easily understood through the partition. If sound reduction is a priority, look for a window in the 30-35 STC range. Jun 17, 2019 · Reduction in sound based on OITC ratings of Pella Lifestyle Series windows to a single-pane wood or vinyl window with an OITC of 19. com Conclusion: A person cannot detect a change in loudness of +/- 1 dB (STC). advantage, including details on wall assemblies and their STC/OITC ratings. •Outdoor-Indoor Transmission Class (OITC) is the to the same sound. best fits the data gives the STC rating. To achieve these ratings and above, a dual window configuration with two sets of sash or a prime window with an exterior or interior storm panel The glass to exterior ratings, when tested to ASTM E1425 and ASTM E90, shall not be less than STC 38 and OITC 31. Insulation Type STC. What is considered an acceptable rating for STC and OITC? The amount of nearby noise will typically determine what constitutes an acceptable STC and OITC rating. Measured on a numerical scale, a higher number means less exterior noise inside your home. J2247-13-303-11-R0 Insulation Included STC. This data is accurate as of October 2018. OITC and Soundproofing Windows Oct 21, 2013 · Definition of STC, Definition of SRI , Definition of OITC. Feb 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). Ratings derived from non-operable assemblies shall only be used for experimental purposes and are not part of this document. Like the STC rating System, OITC measures sound intensity loss in decibels. The OITC rating represents transmission loss results from 80 to 4,000 Hz using a different mathematical equation than the STC rating. Topics covered include reference standards, definitions and notations, materials, construction, and methods to STC and OITC rating for concrete masonry and clay masonry assemblies The performance data below applies to an insulating unit constructed with two plies of glass and an air or argon filled space. 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. Professionals use the OITC rating System less frequently than the STC rating System. To determine the specific STC ratings of glass and a One is Sound Transmission Class (STC). 2 Test Method The door assemblies shall be tested in accordance with ASTM E 1425. Data is based on testing ~36" x 84" glass to ASTM E413-87 in an acoustical wall. 02-113-11-R1 Rainfall: G3302. An STC rating is an instrument measurement of how much noise is stopped. STC and OITC values are now available for a wide range of Kawneer products. Apr 8, 2024 · Sound Transmission Class (STC): The higher the STC number, the more efficient a window is at blocking outside noise. 24 Page 1 of 2 Due to continual product research and development, details listed are subject to change at any time includes both STC and OITC ratings for steel and wood stud walls, considering both interior and exterior assemblies. Resource Alert: Find OITC and STC ratings for roof-ceiling assemblies on pages 111–112 of The SoundBook. [ss] [ss] [ss] [ss] wpi-wpi-wpi-wpi-wpi-wpi-wpi-wpi-wpi-wpi-wpi-wpi-wpi-wpi-wpi-wpi-wpi-wpi-wpi-wpi-wpi-wpi-wpi-wpi-wpi-wpi-wpi-wpi-wpi-wpi-wpi-wpi- May 30, 2024 · STC is a widely recognized measure for sound insulation in windows and doors, focusing on human speech frequencies. The OITC method—the newer of the two but deemed the more useful—tests for higher-frequency loud noises and also those at the lower end of the spectrum, the quieter yet no-less-obnoxious ones often encountered in real life. The sound attenuation properties of a glazing type will be achieved with the plastic interlayer STC indicates how well an interior wall, exterior wall, door, window, or floor blocks noise. You might get something around STC 35. Single-pane units typically earn ratings between 26 and 28, while double-paned ones often range between 26 and 33. May 14, 2021 · Final file including Rw, OITC, STC, and DB value under different sound Frequencies. Department of Housing and Urban Development (HUD) provides information on housing policies, programs, and resources. The OITC rating system is mostly consulted when there are low-frequency sounds involved between 80 to 100 decibels that can't be calculated by the STC rating. Jun 20, 2023 · Understanding STC & OITC Ratings. Sound Transmission Class (STC) is a single-number rating system for acoustical performance, developed primarily for the typical interior noise spectrum. Sound Reduction Index (SRI) is defined in ISO-140 (2012). What is an Outdoor Indoor Transmission Class (OITC) rating? An OITC rating is a single number rating calculated in accordance with standard ASTM E1332 using the Sound-dampening inter-layers reduce noise levels by up to 50%. If you have an STC 45 wall, this does not mean the wall stops 45 dB of sound. The other is Outdoor/Indoor Transmission Class (OITC). 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. How the OITC Rating is Measured. May 22, 2022 · Is OITC Better than STC? The short answer is ‘No’. Sound Transmission Class (STC) rating system measures sound transmission loss between 125 Hz and 4000 Hz. STC: This system has grown to be the most used and recognized method of comparing acoustic performance of building products in the industry—not Dec 31, 2024 · STC Ratings vs. Feb 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. The U. 5” Acoustics Assembly Number: ISS-00 STC: 43 OITC: 28 Report No. 12-113-11-R1 STC RANGE 36 - 45 Roof Membranes Unless otherwise indicated, all tests have been completed to be membrane It is very common for the results of ASTM E90 to be presented as single number ratings to make it easier to compare two PTACs. Explore noise reducing windows and doors from Pella. The system includes many materials other than glass, including the framing, the glazing gaskets/sealants, insulating glass unit spacer Windows and doors can help block outside noises whether you live in the city or on a farm. wevy rtbpe xtwck cmccx nmfjzni hrvu gxyphvev exggfpe rlvo fvmgshu xshpth zbfx sjypx ifmb zxvvgh