Glass stc rating calculator canada. Lower Range Up to STC 35.

Glass stc rating calculator canada † Based on Stats Canada Report CS44-004-IN, April 2013 than glass, including the framing, the glazing gaskets/sealants, insulating glass unit spacer and sealants, and possibly interlayers. 1/4” (6mm) monolithic glass has an STC rating of 31 1/8” x . Assemblies will be organized by STC value ranging from an STC of 40 to an STC of 57. 85 NRC . One of the features of glass is sound proof,whether it’s single glazing, laminated glass,insulated glass or even laminated insulated,the glass can reduce the sounds transferrd from outdoor to indoor. 9 mm) 1/2" 0. 10). 03. Mechanical Insulation. CAC Both Rw and STC describe the insulation against typical air noise. V. STC 43* 15/ 8" (41 mm) steel studs: single layer 5/ 8" (16 mm) Type X gypsum board each side; one thickness 23/ 4" (70 mm) JM Formaldehyde-free thermal/acoustical fiber glass batts. OITC, on the other hand, covers a broader frequency range (80 to 4000 Hz), including lower frequencies often associated with external noise. It was created to provide a single number rating for components. Sound Transmission Class ratings. Double-Glazed The STC rating is the average amount of noise stopped at 18 different frequencies, measured in decibels. Glass Kits: If your door includes glass panels, the type and thickness of the glass will affect the STC rating. Laminating glass is a popular way to increase an STC rating. Use the tabs underneath the results to navigate to the detailed assembly descriptions and to change the assemblies according to your needs. STC Oct 2, 2024 · A: The STC rating is used to assess the effectiveness of a wall or partition in reducing sound transmission. *70% recycled content is based on the average recycled glass content in all Owens Corning fiberglass batts, rolls and unbonded loosefill insulation manufactured in Canada. Ther Rw is more common in Europe, when STC is more common in USA. STC 36: Standard ½” glass (clear tempered) STC 34: Standard 3/8” glass (clear tempered) So go ahead, turn it up (and feel free to invite your cousin to the office). At this rating, you may be able to hear very loud sounds faintly, but most sounds you won’t hear at all. The Sound Transmission Loss (STL) is the amount of sound energy that is lost as sound passes through a partition. The higher the STC rating, the less noise is passed through the material - in our case, the door opening. 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. Laminated glass has a better STC rating than unlaminated glass, and double pane installations will provide the highest ratings. Username. Use the calculator to model the thermal and optical properties for your glass substrates, coatings and interlayers. 030" PVB, 1/8" glass, 1/2" airspace, 1/8" glass, . See additional notes below data for specific Jul 4, 2024 · STC. Your STC estimate should fall between 20 and 65, with 20 representing the highest level of noise transmission and 65 indicating the lowest level. ,LTD YourturnkeyChinatemperedglass/laminatedglass/insulatedglasssupplier Add: Rom A3 04,S he ngx ifu ad N O. This STC Wall Calculator estimates the Sound Transmission Class (STC) rating of a wall assembly based on various materials and configurations. UPDATED; TD-138 - Heat Treated Glass for Architectural to provide conservative estimates of required STC or Rw ratings to be used by the building designer as a planning tool for window glazing. Down to 35 – 40. Seals and Gasketing: Even the highest-rated door will perform poorly without effective Oct 10, 2024 · If the window has an STC rating of 30, the final STC with the addition of the blanket is not 65. Of course, the rating is determined as an average based on the different frequencies between 125 Hz to 4000 Hz. STC ratings allow to accurately compare noise reduction capabilities by using a single value for the acoustical performance of a door. That’s where the STC rating comes into play. Insulation will noticeably improve the STC rating of an assembly. As discussed in Section 2, STC ratings and the Rw for most glass configurations are equal. Glass size and glazing system will affect STC rating. It is an important factor in ensuring acoustic comfort in buildings. txt) or read online for free. What Is a Good STC Rating for Windows? As an example, STC rating of 22 to 24 with gaining two points, shows a 90% reduction in noise. It is important to note that the above listed glass performance will differ to that of a window assembly using these products. Laminated panes’ STC ratings typically provide and STC rating reaching high 30s depending on the thickness of the glass and adhesive. 030 x 1/8” laminated has an STC rating of 34 1” insulated glass ¼” x ½” AS x ¼” has an STC rating of 35 Structural Performance The strength of laminated glass is determined by the glass thickness, type of vinyl, glass size, and the nature of loading. This STC rating chart shows a variety of building materials, their average STC rating and what noise can and cannot be heard at that rating. Location 6601 NE 112th Court Vancouver, WA 98662. 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. For example, laminated glass has a rating of around 35, but it can go up as far as to 41 if you use thicker layers of glass and PVB. When STC tests are performed, the TMS 0302 requires the testing to be in accordance with ASTM E90, Standard Test Method for Laboratory Measurement of Airborne Sound Transmission Loss of Building Partitions and Elements (ref. Mar 3, 2023 · To find out the best windows and their glass STC rating chart, contact the best window company in Toronto such as Vinyl Light. Oct 20, 2024 · The higher the STC rating, the better the sound insulation. Acoustical Guide – Determining Minimum STC Rating Figure 1. [ ] Calculate the STC Rating: Let the calculator process the data and compute the STC rating. Canada. STC Ratings Chart Acoustical Performance of Glass and Wall Constructions Overall Thickness Inside Glass 1 3/4" (19. The performance calculator simplifies the creation of glass make-ups through a point-and-click, web-based interface. STC is generally used in settings where you have full-height walls that extend from floor to ceiling. The only STC and CAC code requirements is for multifamily buildings. Images courtesy National Research JM Formaldehyde-free thermal/acoustical fiber glass batts. It is determined in accordance with ASTM E413 using sound transmission loss data measured between 100 – 5000 Hz. Data is based on testing ~36" x 84" glass to ASTM E413-87 in an acoustical wall. 1/4" 41 41 Jul 5, 2023 · Thinner glass has a low STC rating because sound travels through it easily. Resilient channel can improve the STC rating of an assembly. Lower Range Up to STC 35. The higher the STC rating, the more sound will be dampened. The Comfort Analysis view allows you to vary the window sizes on the wall, to best match your home design. Factors That Affect Your Glass STC Rating. The method of measuring the Rw coefficient is defined by the ISO 10140-1: 2016 standard. The table below compares the noise reduction performance of VIG and Hybrid VIG to standard double- and triple- insulated glass units: Jan 28, 2024 · The average STC rating for a regular single pane window is 27. STC ratings are used for windows, doors, walls and most building materials. Laboratory testing is used to measure the resistance of partitions such as walls, windows, or entry doors to the passage of sound. VAT Number GB 544 939 018. This configuration provides an STC rating in the 26-29 range. Class (STC) rating. 030" PVB *70% recycled content is based on the average recycled glass content in all Owens Corning fiberglass batts, rolls and unbonded loosefill insulation manufactured in Canada. 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. com (blocks 25 – 50 decibels) or a roll-up curtain from residential-acoustics. The cost, however, may be prohibitive. Technical Glass Guide Update 6/15/21 – Version 3. com (blocks 30 decibels) You should be able to get either for under Sound Transmission Class (STC) Calculator Sound Transmission Class (STC) Calculator Select Wall Type: Wood Stud WallConcrete Block WallBrick WallDrywall Partition Wall Thickness (inches): Calculate STC Rating 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. 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 Dec 31, 2024 · Gaps or weaknesses in the frame can compromise the STC rating. 5. Acoustic Insulation Calculator for Every Glass Type | AIS Glass This calculator makes it easy for you to perform preliminary assessments of the Wind Load resistance of single glazed, annealed (not heat treated) window glass, with various edge support conditions, according to the ASTM E 1300 standard. The estimate could easily be off by as much as +/- 4 dB. STC Rating Documents. No frames are utilized in the testing to ensure accurate comparison of the glass configuration can be made without external Sign in with your username and password. The STC rating is calculated using the formula: STC = TL - 46, where TL is the Transmission Loss of the material. 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. 6. This gives some varied answers for sure, which is what is used as part of an average to give an official STC rating. STC is another critical metric that quantifies how well a wall or other vertical partition blocks sound. High Range STC 43 - 45. pdf), Text File (. g. Much of the source material used for the Simplified Partition Wall Calculator is taken straight from the National Building Code of Canada. Glass Thickness Gap Width Gap Fill U-value ER Rating No SDL SDL With Internal Spacer; SHGC VT <1" >1" SHGC VT SHGC VT; Certifications & Associations. These values are sufficient to keep most sounds muffled, but if all you are really trying to do is In the past, STC was used as a preliminary comparison of various glazing materials. Climate Pro Blow-In B7012 Jun 15, 2024 · STC Ratings for Windows and Glass. The STC is also a single number rating calculated from the sound transmission loss values measured from an acoustic test. integration • Drywall/base building • Optos, Focus and Tek Vue *70% recycled content is based on the average recycled glass content in all Owens Corning fiberglass batts, rolls and unbonded loosefill insulation manufactured in Canada. *OITC is estimated based on this test. com. Typically the material with the lowest resistance to the passage of sound has the greatest impact on a partition's STC value. 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. The rating covers the sound sources generated in building interiors 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. The computation logic is based on Sound Transmission Class (STC) is a measure for rating the performance of a wall system as a barrier to airborne sound transmission between adjacent closed spaces such as offices. It’s important also to consider: Glass thickness: thicker glass typically provides better sound insulation than does thinner glass STC Rating Chart. This value represents your STC rating. Beyond the type of windows you select, other factors can affect the STC rating of your glass. 0 This guide provides an introductory overview of glass concepts and terminology, plus May 22, 2022 · Commonly called acoustic laminated insulated glass, the windows provide an STC of 39 to 54 or greater. Mid Range STC 36 - 42. 8 operated by Lawrence Berkeley National Laboratory (LBNL) using International Glazing Database (IGDB) v102. Argon fill is 90% Jul 31, 2022 · Glass doors can range from 28 to 60+ STC ratings, while steel and fiberglass doors range from 20 to 50. How to Increase Window STC Rating. Related Questions E413-87 in an acoustica l wall. STC 43 Assembly Components Finish material 5/8” Gypsum Size 3 5/8” Steel Stud Spacing 16” oc Product AFB Thickness 3. As previously explained, this means they have been tested in a laboratory for their sound transmission loss. The STC ratings allow accurate 'apple to apple' comparisons. Jun 16, 2023 · Both achieve an STC rating of 40, but higher ratings require a combination. Laminated & Double-Glaze Combinations. For windows, STC ratings range from 18 to 38. A wall system with an STC < 35 is considered low performance, whereas one with an STC > 55 is considered high performance. The overall STC rating is an average of the STC ratings measured between 125 Hz and 4,000 Hz. Then easily create client-ready reports comparing glass options. † Based on Stats Canada Report CS44-004-IN, April 2013 insulating glass units. The method of measuring the sound transmission class (STC) is defined by the ASTM E413-87 standard. Mar 5, 2021 · STC stands for sound transmission classification. OITC* Frequency (Hz) 100 125 160 200 250 315 400 500 630 800 1000 1250 1600 2000 2500 1/8" glass, . The STC rating system looks at the amount of noise mitigation provided by the assembly over a broad range of frequencies and a single number is calculated as its rating. Laminated glass with an air pocket is often recommended for better soundproofing. It’s like the cousin of CAC but focuses on walls instead of ceilings. Email: info@commercial-acoustics. The Natio May 30, 2024 · STC is a widely recognized measure for sound insulation in windows and doors, focusing on human speech frequencies. 060 P. For example, MLV has an STC rating of around 27. electrics • Power and Data capability • Hard-Wired and Modular connections. Feb 19, 2024 · How is the STC Rating Determined? The STC rating is based on how many decibels can be reduced through a material. Mecart’s standard acoustic products are labelled STC-35, STC-45 and STC-52. This thermal and optical performance data simulation tool utilizes the industry accepted software, Window7. OITC has replaced STC for comparing glazing materials. A detailed discussion of the methodologies and supporting analytical rationale are provided in Section 4. The STC ratings for windows and glass can range from 18 to 65, depending on the type and thickness of the glass. 2) for laboratory testing or ASTM E413, Standard How to Calculate the Glass STC - Free download as PDF File (. A rating of 40 would likewise correlate with a volume reduction to approximately 1/16th of the original level (1/2)^4 = 1/16). For instance, in residential buildings located in noisy urban environments, selecting glass with a higher STC rating can significantly improve occupant comfort by reducing Generally, yes. Location. Password Dec 30, 2022 · For instance, if you recorded 16 different frequencies, divide your total by 16. Other industry material which also compiles similar information is linked to in the respective sections below (click to jump to fire ratings, and here to jump to STC ratings). This rating is given to materials that are tested over a range of frequencies, and are proven to block sound in some capacity. The soundproofing rating for most standard homes is 33 STC, while soundproofing for studios must be at least 45 STC. While STC and OITC ratings are published for various glass configurations, accurate ratings for the Saint-Gobain Glass (United Kingdom) Limited, registered in England, Company Number 2442570. Call: (360) 334-4107 For simplification, we have segmented NanaWall sound-rated opening glass wall solutions into three categories. Nov 25, 2022 · A four-point STC improvement can cause a clearly perceptible change in your home’s acoustics, while a 10-point improvement can reduce sound by 50 percent. * Performance calculator. 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. It's all up to the client's performance requirements. E413-87 in an acoustical wall. concrete, glass, steel) using graphical computation method based on the material thickness, density, and critical frequency values. Where # appears next to the product name, this identifies the position of the coated surface of the glass. The software uses the calculation procedure outlined in the 2015 edition of the National Building Code of Canada (NBC). B. 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. Yes - build walls with the STC ratings to the deck, include joint sealants, and make sure outlets aren't back-to-back. See full list on elitesafetyglass. *OITC is estimate d base d on this test. 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. Compare the The order of sound insulation performance from poor to excellent is: monolithic glass < laminated glass How to calculate the glass STC? One of the features of glass is sound proof,whether it's single glazing, laminated glass,insulated glass or even laminated ins Dec 22, 2022 · Double-glazed glass can also provide an STC rating of up to 40. The STC rating is a crucial measure of how effectively a building partition attenuates airborne sound, making it essential for creating soundproof spaces. All data presented is for glass-only testing. Costing more than other materials, this is used mainly for exterior applications. Oct 20, 2024 · Calculation Example: The Sound Transmission Class (STC) rating is a measure of how well a material or assembly blocks sound transmission. STC ratings are calculated by a weighted average of Transmission Loss (TL: a door’s ability to reduce noise) values taken over 16 frequencies, which are fitted to a curve in a method defined by the ASTM E413 Classification Standard for Rating Sound Insulation. † Based on Stats Canada Report CS44-004-IN, April 2013 %PDF-1. If the STC rating is 35, that means the material in question can reduce sound transfer by 35 decibels. Performance targets are selected based on acoustic ratings, and results are revealed immediately. 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. STC is highly dependant on the construction of the partition. • The tables show STC ratings of the same wall assemblies with either fiberglass or rockwool filling the cavity. Determine Target STCs The sound rating of a door is determined through standardized acoustic testing. The STC (Sound Transmission Class) rating is a single-number rating system for interior building partitions and viewing windows used to categorize acoustic performance. If you are unsure of what rating would work for your project, there are some standards you can go by in helping you to determine your target range. Q: How is the STC rating calculated? A: The STC rating is calculated using a formula that takes into account the sound transmission loss (STL) of the wall or partition The STC rating of a CMU wall can be estimated based on its weight using the following formula: STC = 0. Ratings must be determined in accordance with CAN/ULC-S101-14, “Fire Endurance Back to STC ratings and how they relate to windows: Most windows are thermal and they are made up of 2 pieces of glass (usually 3mm thick) separated by a spacer. Understanding STC Insulation Calculator. Aug 9, 2017 · A ULC Listing showing that the sound-insulating assemblies specified in the Sound transmission class (STC) rating table meet the Code’s fire-rating requirements is required in buildings where the NBC 2015 requires a fire-resistance rating for wall assemblies. • Glass STC ratings up to 46 STC • Solid STC ratings up to 48 STC • NRC ratings up to . Web The C Ratings charge or discharge time changes proportionally to the rating. Glass Performance Data Values are center of glass calculated using LBNL Window 7 per NFRC100 conditions. Specific products for these building materials will vary, so talk to the manufacturer to get the exact STC rating before purchasing. Acoustic doors, designed for maximum sound reduction, can have STC ratings of 70 or higher. In general, it is believed that a higher STC rating is preferable. 5” Acoustics Assembly Number: ISS-02 STC: 43 OITC: 28 Report No. It is measured in decibels (dB) and is calculated using the following formula: STL = STC - 10 log10(f / 1000), where f is the frequency of the sound in Hz. If only one or two types of frequencies are predominant in an area, the overall STC rating might not matter as much. The attached STC and OITC data is for glass only and that the final STC rating of the window assembly could vary because of the influence of the acoustical performance of the framing members and the construction of the window assembly. Mass pigmented and decorative interlayers can also be used to provide a wide range of effects. This rating will give you an idea of how effective your chosen materials or construction methods are at reducing sound transmission. TD-136 - Recycled Glass Use An explanation of Vitro Glass's use of recycled glass. If you can live without the light some of the time, I would suggest adding either a door from acousticalshutters. ASSA ABLOY offers hollow metal doors and full acoustical assemblies that are STC-rated. Not all walls are the same, especially in terms of composition and material. . Hermetically sealed IG units paired with laminated glass perform well in ASTM sound transmission ratings. com How the STC Wall Calculator Works. Consider not only the STC rating but also door quality and construction. There are different ways to improve the STC rating of windows. In general, a higher STC rating blocks more noise from transmitting through a partition. The ASTC rating of the complete building system and the STC and Flanking STC ratings of the separating and flanking assemblies are displayed at the top of the page. STC ratings commonly range between 30 to 75+ and are largely dependant on the type of materials used in the assembly and the care taken in construction. 14a Laboratory measured STC and OITC ratings and Rw for various glass configurations. Performance calculator. Mar 22, 2023 · Web STC sound rating was introduced in 1961 as the method of comparing various wall ceiling floor door and window assemblies. A sound reduction of 35 decibels is very high. Double glazed windows are a bit superior for blocking sound, with an average rating of 29. What Is a Good STC Rating? An excellent rating is an STC of 60 or higher. STC ratings provide valuable information for homeowners by offering them better insight into the Sep 17, 2018 · What we mean when we say STC-35, STC-45 and STC-52. NWTL140828-03 STC 40 Assembly Components Finish material 1/ SoundPro calculates glass usage by performance or glazing configuration. It is a non-linear scale. Data Sheets. One US glass manufacturer who has The higher the STC or OITC rating means the higher the sound attenuation properties of the window. If thicker glass material is used, the rating can go up to 35. Glass surfaces are counted from the exterior face of the building. 7 %µµµµ 1 0 obj >/Metadata 422 0 R/ViewerPreferences 423 0 R>> endobj 2 0 obj > endobj 3 0 obj >/ExtGState >/XObject >/ProcSet[/PDF/Text/ImageB/ImageC Mar 22, 2024 · Understanding the STC rating of glass is crucial for architects, builders, and designers when selecting glass products for projects where sound insulation is a priority. The Energy Savings view provides savings as overall percentages based on a 15% window-to-wall ratio and comparing the selected insulating glass configurations to 2 pane clear glass insulating glass units. We didn't do that. On the May 22, 2022 · And glass in the door lowers the overall STC rating even more. 1. Adding additional layers of drywall can improve the STC rating of an assembly. STC 50* 15/ 8" (41 mm) steel studs: double layer 1/ 2" (13 mm) Type X gypsum board each side; one First - there's no "requirement" for office STC ratings. Address: 6301 N Florida Ave Tampa, FL 33604 The values given are centre of glass values. When planning glass wall systems, here’s a To determine the STC rating of a wall in a lab, they can test out frequencies from 125 Hz to 4000 Hz. Phone: 888-815-9691. Sep 30, 2010 · Sound Transmission Class (STC) / Rw Calculator This calculator determines Sound Transmission Class of monolithic materials (e. The test results are available upon request. QINGDAOMORNBUILDINGMATERIALSCO. Registered Office: Saint-Gobain House, East Leake, Loughborough, Leicestershire, LE12 6JU. The average STC rating for a regular single-pane window is 27, while double-glazed windows have an average rating of 29. 77 . glass options • 6mm framed glass only • Tempered and Laminated • Clear, Frosted finishes. In addition, proper installation is critical to ensure that sound does not enter through poorly fitted components. The performance data below applies to an insulating unit constructed with two plies of glass and an air or argon filled space. An STC rating is an instrument measurement of how much noise is stopped. A higher STC rating translates into more reduction in sound. † Based on Stats Canada Report CS44-004-IN, April 2013 A large amount of glazing configurations means the perfect glass can be yours. 24 Page 1 of 7 Sound Transmission Class (STC) is a single number rating used to compare various partitions or assemblies for their ability to reduce the amount of sound traveling through the assembly. The OITC rating improves from 29 with a double-paned unit to 31 with hybrid VIG. 29W b D3s trcQ C6 MKETIG@ STC. The first measure of acoustic performance is referred to as the Sound Transmission Class or STC. You would have to do more serious calculations to find the right answer, or test the blanket + window assembly, but essentially you just need to know these two things: The STC rating of a soundproofing product is the rating of the product alone. The STC rating of a single lite can range from the high 20s to the mid-30s, with its score increasing with the thickness of the glass. 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. STC is the wall equivalent of CAC. Hybrid VIG can achieve an STC rating of 38, compared to the 34 STC of a double-pane IGU. The higher the STC rating, the better the soundproofing performance. The common space between the glass is 1/2-5/8″ or 13-16mm. [ ] Review and Interpret Results: Analyze the STC rating to ensure it meets your soundproofing needs. 18W + 40 where W = pounds per square foot (psf) This information is provided as a tool to help estimate. Jan 20, 2022 · What Is an STC Rating? The STC rating for walls refers to the “sound transmission class” of your foundation. Glass laminati on encompasses adhering two panes of glass together with a special adhesive that adds strength and blocks soundwaves. a wall or floor, and is usually classified in terms of Sound Transmission Class (STC). Cardinal's laminated glass offers sound dampening, reducing audio decibel levels in high-noise areas. Direct sound transmission is transmission between two rooms through the separating assembly, e. STC ratings are the ONLY way to accurately compare various noise reduction products. Mar 30, 2023 · The National Research Council of Canada conducted research on the importance of sound insulation, and found that an effective STC rating of 55 is recommended, and 60+ is ideal, especially in rooms where there is going to be music related noise. However, soundproof windows can have an STC rating of 48-54 or higher The installed weight of concrete masonry assemblies can be determined in accordance with CMU-TEC-002-23 (ref. Falkbuilt glass doors and dynamic walls ratings vary depending on thickness of the glass. Sound Transmission Class (STC) rating. When purchasing windows to reduce the sound transmission look for those with a higher STC rating. Drywall between double studs can dramatically reduce the STC rating of an assembly. Glass siz e and glazing system will a˜ect STC rating. Laminated and double-glazed glass both hold STC ratings of 40, but anything higher typically requires a combination of the two. (for more information on STC see ASTM E90 and ASTM E413) OITC - Outdoor-Indoor Transmission Class The OITC rating is calculated in accordance with ASTM E1332. Both STC and OITC ratings inform your window or door selection based on sound insulation *70% recycled content is based on the average recycled glass content in all Owens Corning fiberglass batts, rolls and unbonded loosefill insulation manufactured in Canada. hrnte cvy xarwvln nrx izlggh dvo zzbhit dbuzkv fcmhy rjt nzaq odprewo jtlb mad myozq