Glass stc rating calculator. STC - is short for sound transmission class.

Glass stc rating calculator. Read more about the tools below .

Glass stc rating calculator The higher the STC rating, the less noise is transmitted from the assembly. Glass Performance Calculator . In addition, proper installation is critical to ensure that sound does not enter through poorly fitted components. Menu. Select materials for sound absorption according to their STC ratings. It is also important to know that the testing standards of the STC are updated from time to time. than glass, including the framing, the glazing gaskets/sealants, insulating glass unit spacer and sealants, and possibly interlayers. The higher the STC rating, the better the sound insulating glass units. [ ] Review and Interpret Results: Analyze the STC rating to ensure it meets your soundproofing needs. 030 P. You may want to consider LBNL WINDOW software for glass SHGC calculation STC ratings are used for windows, doors, walls and most building materials. concrete, glass, steel) using graphical computation method based on the material thickness, density, and critical frequency values. To achieve even higher STC Ratings, window manufacturers may offer the addition of laminated glass, dissimilar glass and other sound dampening components to their window design. glass and gap thicknesses. Where # appears next to the product name, this identifies the position of the coated surface of the glass. *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. The method of measuring the Rw coefficient is defined by the ISO 10140-1: 2016 standard. Laminating glass is a popular way to increase an STC rating. See additional notes below data for specific If a wall has a rating of 35, it does not mean that the wall stops 35dB of sound. 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 the user’s responsibility to STC OITC Test Date Test Number Operating Style Series Numbers Tested Size OA Glass 1 Glass 2 Acoustical Ratings - Trinsic I V300 updated 04. Lower Range Up to STC 35. Calculating the required improvement involves subtracting the target STC rating from the existing STC The STC value for a monolithic 6mm glass is 31, for an insulated 24mm glass is 35 and for a 13. Login You can determine STC rating by using the following STC calculation formula: Mar 6, 2018 · Phone: 888-815-9691. Floor/Ceiling System Constructions for Sound Control *Indicates that the value is an estimate. An STC rating is an instrument measurement of how much noise is stopped. SoundPro calculates glass usage by performance or glazing configuration. Call: (360) 334-4107 Simply a measure of the amount of natural daylight the glass allows through. Web 44 Dunham Rd. Laboratory testing is used to measure the resistance of partitions such as walls, windows, or entry doors to the passage of sound. Registered Office: Saint-Gobain House, East Leake, Loughborough, Leicestershire, LE12 6JU. Double-Glazed Jan 20, 2022 · Learn how to determine the STC rating of a wall. 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. Both Rw and STC describe the insulation against typical air noise. Glass size and glazing system will affect STC rating. Web A STC Wall Rating Calculator is a great tool to help you determine the sound absorption of your wall Typical dual glazed windows can achieve better ratings of 25-27. A wall system with an STC < 35 is considered low performance, whereas one with an STC > 55 is considered high performance. 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. Saint-Gobain Glass (United Kingdom) Limited, registered in England, Company Number 2442570. STC ratings are the ONLY way to accurately compare various noise reduction products. Double-Glazed This document provides sound transmission class (STC) ratings for various glass and wall constructions. Laminated panes’ STC ratings typically provide and STC rating reaching high 30s depending on the thickness of the glass and adhesive. If you double the air space, you can generally get about a 3 dB improvement in the transmission loss. Select the glass substrate, coatings, interlayers, then get the performances of your glazing: solar factor, light factors, thermal transmission, noise reduction indexes, glass aesthetic, carbon footprint Source: STCratings. The performance data below applies to an insulating unit constructed with two plies of glass and an air or argon filled space. You can’t add STC ratings together. Search for suitable solutions based on glazing parameters and acoustic requirements. Use the tabs underneath the results to navigate to the detailed assembly descriptions and to change the assemblies according to your needs. Assemblies will be organized by STC value ranging from an STC of 40 to an STC of 57. Perceptibility of STC Differences: While it may seem that a higher STC rating indicates better sound isolation, minor differences between scores are often imperceptible in real-world scenarios. 6. If only one or two types of frequencies are predominant in an area, the overall STC rating might not matter as much. 1-866-949-9269. The computation logic is based on Phone: 888-815-9691. ) based on its ability to reduce sound coming through it. Sound Transmission Class ratings. Enhance your digital specifications with our customised BIM files designed for specific glazing applications. TD-136 - Recycled Glass Use An explanation of Vitro Glass's use of recycled glass. Glass size and glazing system will affect STC rating. In the USA, it is widely used to rate interior partitions, ceilings and floors, doors, windows and exterior wall configurations (see ASTM International Classification E413 and E90). 1/8" 35 35 components. Email: info@commercial-acoustics. 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. Once a calculation is complete, users have the option to refine these selections, and then receive a detailed report including acoustic ratings, test details, a sound transmission Aug 11, 2015 · The new Acoustic Calculator 2. STC is a measure of a material or structure’s ability to reduce the transmission of airborne sound, such as speech or music, from one side to the other. E413-87 in an ac oust ical wall. While STC and OITC ratings are published for various glass configurations, accurate ratings for the A leader in tools for the glass industry. STC Band | Source. Adding additional layers of drywall can improve the STC rating of an assembly. Vitro glass stc ratings calculator. Dec 22, 2022 · Double-glazed glass can also provide an STC rating of up to 40. Acoustical Guide – Determining Minimum STC Rating Figure 1. Laminated products: The Performance Calculator allows the user to model a wide variety of laminated glass makeups using different float glass substrates, coatings and interlayer material, including those makeups where the coating faces the interlayer. STC ratings are determined through standardized laboratory tests. 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. To get started, input your required performance data below. The distance between panes of glass matter. Oct 6, 2023 · The STC floor rating calculator is a valuable tool used to determine the Sound Transmission Class (STC) rating of a floor or partition. Acoustical Performance of Glass and Wall Constructions Overall Thickness Inside Construction Space Outside STC Value ISO RW 3 1/4" (7. Nonetheless, effective sound insulation is considered to begin in about the 50s. E413-87 in an acoustica l wall. Visit our website atwww. Dec 28, 2009 · Sound Transmission Class (STC) / Rw Calculator This calculator determines Sound Transmission Class of monolithic materials (e. 1/4" 41 41 *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. 14a Laboratory measured STC and OITC ratings and Rw for various glass configurations. It is important to note that the above listed glass performance will differ to that of a window assembly using these products. As an example, let’s take a typical single-pane window and a masonry wall. † Based on Stats Canada Report CS44-004-IN, April 2013 Vitro glass stc ratings chart com, or call 1-855-VTRO-GLS (887-6457). STC rating (Sound Transmission Class rating) is a score given to a building’s surface (wall, ceiling, window, etc. Data is based on testing ~36" x 84" glass to ASTM E413-87 in an acoustical wall. That being said, anything below an STC rating of 40 might garner comments about paper thin walls. The farther the panes are apart the higher the 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. The higher the STC rating, the more sound will be dampened. Compare the The values given are centre of glass values. STC is a rating given to wall assemblies that measures how well the assembly keeps sound from escaping into an adjacent space. Jan 28, 2025 · Continue reading: STC vs NRC. High Range STC 43 - 45. The only input requiring some technical knowledge is glass surface emissivity. STC is Sound Transmission Class which is a single number rating derived from individual transmittance losses at specified test frequencies. Apr 6, 2023 · For instance, a standard material, let's say glass, has an STC of about 20s, while the STC of an average wall is about 30s. STC is determined by a weighted average of TL 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. To determine the specific STC ratings of glass and a 4 days ago · How is the STC Rating Determined? The STC rating is based on how many decibels can be reduced through a material. If an sound is 60 dB on one side of the window and 30 dB on the other, than the STC rating of the window is 30. Both STC and OITC ratings inform your window or door selection based on sound insulation 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. Address: 6301 N Florida Ave Tampa, FL 33604. 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 Jun 15, 2024 · STC Ratings for Windows and Glass. Read more about the tools below How to Calculate the Glass STC - Free download as PDF File (. 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. The first measure of acoustic performance is referred to as the Sound Transmission Class or STC. However, soundproof windows can have an STC rating of 48-54 or higher A higher STC rating translates into more reduction in sound. The document provides acoustic performance data tables for insulating glass, triple insulating glass, monolithic glass, and laminated glass constructions. Your go-to portal for discovering the perfect glazing solutions, tailored to your requirements. The average STC rating for a regular single-pane window is 27, while double-glazed windows have an average rating of 29. It’s important also to consider: Glass thickness: thicker glass typically provides better sound insulation than does thinner glass 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. Sound Measurement: The sound levels are recorded in the source room and an adjacent room (the The quite pleasant cooperation with Morn BM helps us winning more and more projects,Morn BM's professional response is faster than light,they can always find the right materials we need with good price and good service,Morn makes continuous fast growing possible. 24 mm) 1/8" 0. Drywall between double studs can dramatically reduce the STC rating of an assembly. Beyond the type of windows you select, other factors can affect the STC rating of your glass. About Vitro Architectural Glass. 24 Page 1 of 7 Resilient channel can improve the STC rating of an assembly. Calculation Example: The Sound Transmission Class (STC) rating is a measure of how well a partition or other building element blocks sound. One US glass manufacturer who has 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. Thanks to its user-friendly glass calculator, Calumen ® allows you to design all the glazings for your project. Ther Rw is more common in Europe, when STC is more common in USA. Location 6601 NE 112th Court Vancouver, WA 98662. Research indicates that a difference of 5 points is generally required for a noticeable change in sound perception. This calculator provides the calculation of sound transmission class (STC) rating for a double-partition wall system. 5. Mid Range STC 36 - 42. The method of measuring the sound transmission class (STC) is defined by the ASTM E413-87 standard. † Based on Stats Canada Report CS44-004-IN, April 2013 the center of glass with no spacer system or framing. The lower the number the better the performance of the glazing. Search. STC rating goes from 25 – 65. Here we introduce a simple formula to calculate the glass STC-sound transmission class. Technical Glass Guide Update 6/15/21 – Version 3. com. The process involves: Sound Generation: A noise source is placed in one room (the source room). Understanding STC Jul 15, 2021 · For U-value calculations, only simple user inputs are required, e. . Then easily create client-ready reports comparing glass options. jm. The performance calculator simplifies the creation of glass make-ups through a point-and-click, web-based interface. How Are STC Ratings Measured? Testing and Calculation. The Natio Oct 20, 2024 · This calculator provides the calculation of Sound Transmission Loss (STL) for a given Sound Transmission Class (STC) rating and frequency. Laminated and double-glazed glass both hold STC ratings of 40, but anything higher typically requires a combination of the two. This gives some varied answers for sure, which is what is used as part of an average to give an official STC rating. If your target STC rating is 39, then you will likely need to increase the air space to 2". 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”. For instance, a double hung window made with 1/4" annealed glass and a 1/2" air space may have an STC rating of 33. VAT Number GB 544 939 018. com Or call:1-800-654-3103 Wood Fr aming STC and IIC Values Sound Control STC 51, IIC 78 (STC 52, IIC 49, with vinyl floor in place of carpet and pad) 2" x 8" (51 mm x 203 mm) wood joists: 1/ Mar 22, 2023 · One of the features of glass is sound. 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. V. You can use the preceding table as a guide for choosing materials based on the required degree of sound control. Seals and Gasketing: Even the highest-rated door will perform poorly without effective glass constructions only. STC ratings are used for windows doors, walls & most building materials. Oct 21, 2023 · 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. STC STC Ratings Chart Acoustical Performance of Glass and Wall Constructions Thickness Inside Construction Space Outside STC Value ISO RW 3 Single Laminated Glass 1 1 STC Ratings Chart Acoustical Performance of Glass and Wall Constructions Overall Thickness Inside Glass 1 3/4" (19. * OITC* Frequency (Hz) 100 125 160 200 250 315 400 500 630 800 1000 1250 1600 2000 2500 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. Laminated glass has a better STC rating than unlaminated glass, and double pane installations will provide the highest ratings. *OITC is estimate d base d on this test. Seals and Gasketing: Even the highest-rated door will perform poorly without effective Jun 15, 2024 · STC Ratings for Windows and Glass. Mass pigmented and decorative interlayers can also be used to provide a wide range of effects. 03. Phone: 888-815-9691. A detailed discussion of the methodologies and supporting analytical rationale are provided in Section 4. STC ratings range from 0 to 100. If the STC rating is 35, that means the material in question can reduce sound transfer by 35 decibels. 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. May 4, 2019 · The order of sound insulation performance from poor to excellent is: monolithic glass < laminated glass <double insulated glass < triple insulating glass< laminated insulated glass. txt) or read online for free. Laminated glass with an air pocket is often recommended for better soundproofing. B. pdf), Text File (. Glass laminati on encompasses adhering two panes of glass together with a special adhesive that adds strength and blocks soundwaves. Read more about the tools below Class (STC) rating. A leader in tools for the glass industry. Glass Analytics online tools offer a comprehensive suite of engineering and analytical reports that demonstrate the advantages of high-performance glass in building facades. For windows, STC ratings range from 18 to 38. How SoundPro works. Laminated glass stc rating calculator. Read more about the tools below 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. 4. Factors That Affect Your Glass STC Rating. † Based on Stats Canada Report CS44-004-IN, April 2013 To determine the STC rating of a wall in a lab, they can test out frequencies from 125 Hz to 4000 Hz. An STC of 40 is the "privacy threshold" Replacing single pane with double or triple pane windows will not significantly increase an STC rating. The STC and ISO RW values indicate the acoustical performance ratings, with higher numbers indicating better sound Oct 2, 2024 · Sound Transmission Class Calculator. Address: 6301 N Florida Ave Tampa, FL 33604 Sound transmission class (STC) and Impact insulation class results are given as well as the following detail data at ⅓ octave band center frequency ranging from 125 Hz to 4000 Hz: TL / STC: Floor Layer Estimated Transmission Loss Dec 31, 2024 · Gaps or weaknesses in the frame can compromise the STC rating. 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 Jul 9, 2018 · Users have a range of variables to consider, including the type of acoustic interlayer, glass thickness, air space, types of insulated glass, and design strategies. 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. Sound Transmission Class Sound Transmission Class (STC) is a single-number rating system that assigns a value to a product to indicate how well that product insulates against unwanted noise A Basic diagram that shows the difference between NRC & STC Ratings. It includes the Sound Transmission Class (STC) rating and Outside-Inside Transmission Class (OITC) rating, as well as sound transmission loss data across a range of frequencies, for various glass makeups and thicknesses. It lists the construction details and thickness of single laminated glass, laminated insulating glass, airspaced glass, monolithic glass, and various wall constructions. OITC, on the other hand, covers a broader frequency range (80 to 4000 Hz), including lower frequencies often associated with external noise. NWTL140828-03 STC 40 Assembly Components Finish material 1/ *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. Address: 6301 N Florida Ave Tampa, FL 33604 The STC or sound transmission class is a single number method of rating how well wall partitions reduce sound transmission. When planning glass wall systems, here’s a *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. Sound Transmission Class is more complicated calculation than NRC, involving the graphing of "contour curves", transmission loss curves, and identifying a number on the contours where the two graphs are closest together. *OITC is estimated based on this test. The STC ratings allow accurate 'apple to apple' comparisons. STC is used to measure the sound transmission loss of interior walls, ceilings and floors. STC - is short for sound transmission class. UPDATED; TD-138 - Heat Treated Glass for Architectural Laminated IG (laminated glass toward interior) Double-laminated IG (various) Reports are generated in Eastman format and serve as guidance only. g. Insulation will noticeably improve the STC rating of an assembly. Explanation. Of course, the rating is determined as an average based on the different frequencies between 125 Hz to 4000 Hz. For SHGC calculations, more inputs are required and a simple online calculator is not sufficient. It is the user’s responsibility to However, it is important to note that different glass options and the use of combination units may affect the sound abatement performance of the unit. 0 This guide provides an introductory overview of glass concepts and terminology, plus the center of glass with no spacer system or framing. STC 43 Assembly Components Finish material 5/8” Gypsum Size 3 5/8” Steel Stud Spacing 16” oc Product AFB Thickness 3. Laminated & Double-Glaze Combinations. Dec 31, 2024 · Gaps or weaknesses in the frame can compromise the STC rating. The final STC/OITC rating of the window assembly will typically be reduced from the base glass acoustical rating. For simplification, we have segmented NanaWall sound-rated opening glass wall solutions into three categories. [ ] Calculate the STC Rating: Let the calculator process the data and compute the STC rating. Glass surfaces are counted from the exterior face of the building. For videos, design insights and technical education, visit the Vitro The standard 1″ commercial Insulating Glass (IG) unit consists of two lites of 1/4″ glass and a nominal 1/2″ air space. Use the calculator to model the thermal and optical properties for your glass substrates, coatings and interlayers. Calculation Example: The sound transmission class (STC) rating is a measure of how well a wall or partition blocks sound transmission. Instead, the STC will be calculated using logarithms, and will probably 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. May 30, 2024 · STC is a widely recognized measure for sound insulation in windows and doors, focusing on human speech frequencies. At this rating, you may be able to hear very loud sounds faintly, but most sounds you won’t hear at all. As discussed in Section 2, STC ratings and the Rw for most glass configurations are equal. 1. It is a logarithmic scale and ranges from 18 to 50 for windows. Pilkington Wind Load Calculator. Costing more than other materials, this is used mainly for exterior applications. Glass Kits: If your door includes glass panels, the type and thickness of the glass will affect the STC rating. 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. Address: 6301 N Florida Ave Tampa, FL 33604 to provide conservative estimates of required STC or Rw ratings to be used by the building designer as a planning tool for window glazing. Window STC Rating Chart. 0 is part of Guardian Plus, a business support programme for the glass and glazing industry within the UK and Ireland, that offers online support ranging from (instant) responses to technical enquiries to in-house or external training in glass and glass-related topics. 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. We have being working with Morn BM for several years,whether it's glass,aluminium ,hardware,steel products,Morn BM significantly improve an IIC rating. 060 P. May 14, 2021 · Acoustic Glass Performance Calculator provided by AGC, Guardian, Kuraray, Saflex, SGG and Viracon, to get desired RW/STC/OITC Value. 5” Acoustics Assembly Number: ISS-02 STC: 43 OITC: 28 Report No. Save as PDF 800 Park Drive , Owatonna , MN 55060 US | (800) 533-2080 Jul 5, 2023 · Thinner glass has a low STC rating because sound travels through it easily. The STC ratings for windows and glass can range from 18 to 65, depending on the type and thickness of the glass. The STC (Sound Transmission Class) rating is a single-number rating system for interior building partitions and viewing windows used to categorize acoustic performance. [3] The STC provides a standardized way to compare products such as doors and windows made by competing manufacturers. While STC and OITC ratings are published for various glass configurations, accurate ratings for the How to Calculate the Glass STC - Free download as PDF File (. What Is a Good STC Rating? An excellent rating is an STC of 60 or higher. 9 mm) 1/2" 0. U-Value – measure of the thermal insulation of the glass and expressed as watts per square metre. May 13, 2022 · Sound Transmission Class (STC) A Guide to True NRC™ Acoustic Rating. It is used for exterior and interior walls, ceilings and floors and in the past was also used for preliminary comparison of the performance of various glazing materials. It is used to evaluate the acoustic 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). On the The STC rating is the average amount of noise stopped at 18 different frequencies, measured in decibels. STC 27 – Single-pane window glass STC 46 – 1/2” drywall glued to a 6” concrete block and painted on both sides STC 72 – 8” painted concrete block wall with 1/2” drywall on both sides, installed on independent steel studs, with insulation in all cavities Sound transmission class (STC) ratings solve that problem by giving a single value to acoustical performance for a door. Typically the material with the lowest resistance to the passage of sound has the greatest impact on a partition's STC value. It is a non-linear scale. Glass siz e and glazing system will a˜ect STC rating. STC ratings are used for windows, doors, walls and most building materials. When looking at STC ratings for windows and doors be aware that the glass manufacturers publish values for the glass they produce. Jun 16, 2023 · Both achieve an STC rating of 40, but higher ratings require a combination. † Based on Stats Canada Report CS44-004-IN, April 2013 A leader in tools for the glass industry. Welcome to our interactive glass selector tool where you can find glass that meets your performance requirements. Guardian Glass has developed easy-to-use, advanced software for glass and glazing system analysis. This rating will give you an idea of how effective your chosen materials or construction methods are at reducing sound transmission. Performance targets are selected based on acoustic ratings, and results are revealed immediately. Sound Transmission Class (STC ) is an integer rating of how well a building partition attenuates airborne sound. Calculate What You Need for the Improvements You Want. May 6, 2020 · As a result it is not recommended for glass selection of exterior wall applications since the single-number rating was achieved under a specific set of laboratory conditions. 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. STC is the wall equivalent of CAC. 52mm laminated glass is 39. For instance, if you have an STC of 40 on one wall and decide to add another wall with an STC of 20, the STC of both walls combined will not be 60. The STC rating Performance calculator. ihj ila kajixcr aijimnq hoak vxbax vkfyd bzutga rgsxcw cspocro hivuggqp sptrsn eopfqgu zsc ypqf