Glass stc rating calculator pdf. JM Formaldehyde-free thermal/acoustical fiber glass batts.

Glass stc rating calculator pdf As discussed in Section 2, STC ratings and the Rw for most glass configurations are equal. • WD65 with STC 38 laminated glass has an STC of 36. • SL60 with STC 38 laminated glass provides an overall STC of 36. Factors Affecting the STC Level on Site. Precision Oct 1, 2019 · Historically, STC ratings have been used to describe the performance of exterior façade assemblies. CAC -114• glass) with an STC rating of 34. 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. The STC ratings allow accurate 'apple to apple' comparisons. The Natio Dec 31, 2024 · Gaps or weaknesses in the frame can compromise the STC rating. Pipe Insulation. 5. 1. Beyond the type of windows you select, other factors can affect the STC rating of your glass. This rating will give you an idea of how effective your chosen materials or construction methods are at reducing sound transmission. Address: 6301 N Florida Ave Tampa, FL 33604 Saint-Gobain Glass (United Kingdom) Limited, registered in England, Company Number 2442570. † Based on Stats Canada Report CS44-004-IN, April 2013 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. The MTC Class is 100% based on an STC calculation, with the same reference Oct 10, 2024 · If the window has an STC rating of 30, the final STC with the addition of the blanket is not 65. nz 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 the STC value, the better a construction reduces the transmission of sound. 70 60 --STC38 Phone: 888-815-9691. OITC, on the other hand, covers a broader frequency range (80 to 4000 Hz), including lower frequencies often associated with external noise. Argon fill is 90% and air fill is 100%. Glass siz e and glazing system will a˜ect STC rating. STC is another critical metric that quantifies how well a wall or other vertical partition blocks sound. 0 This guide provides an introductory overview of glass concepts and terminology, plus How to Calculate the Glass STC - Free download as PDF File (. Seals and Gasketing: Even the highest-rated door will perform poorly without effective Performance calculator. the dimensions of the glass and the glazing system utilized can influence the Sound Transmission Class (STC) rating. laminated glass n n 5/2011 S. STC Rating Documents. 25-inch 3. The STC (Sound Transmission Class) rating is a single-number rating system for interior building partitions and viewing windows used to categorize acoustic performance. 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. A STC requirement of 35 is common for construction near airports – therefore a STC rating of 35 or greater would qualify. Page 2/3 Acoustic Technical Information Float mm Rw (dB) 3 , 4 30 5 , 6 31 8 34 10 35 12 37 19 39 Duo Plus™ IGU with Float mm Rw (dB) 4/12/4 32 5/12/5 33 STC ratings are determined in a laboratory under controlled conditions. That’s where the STC rating comes into play. Drywall between double studs can dramatically reduce the STC rating of an assembly. * All values shown are glass only. Floor/Ceiling System Constructions for Sound Control *Indicates that the value is an estimate. co. Glass laminati on encompasses adhering two panes of glass together with a special adhesive that adds strength and blocks soundwaves. 7. Consider not only the STC rating but also door quality and construction. 50-inch Gypsum Board ea side 2x4 Wood Studs 34 STC 4-inch 6-7 PSF. Mechanical Insulation. 030 P. The order of sound insulation performance from poor to excellent is: monolithic glass < laminated glass <double insulated glass < triple insulating glass< ion STC caused by the air. The four-point increase in STC rating is the resuH of dampilg provided by the PVB intedayer used in the laminated glass. Even then, differences of 1-2 points STC can occur for the same assembly in the same laboratory. 5+6*2. Double-Glazed The values given are centre of glass values. 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. e. 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. 62-inch Gypsum Board ea side 2x4 Wood Studs 35 STC 5-inch 7-8 PSF Jul 31, 2022 · Glass doors can range from 28 to 60+ STC ratings, while steel and fiberglass doors range from 20 to 50. 1/4" 41 41 Location 6601 NE 112th Court Vancouver, WA 98662. A higher STC rating translates into more reduction in sound. [ ] Calculate the STC Rating: Let the calculator process the data and compute the STC rating. For windows, STC ratings range from 18 to 38. Costing more than other materials, this is used mainly for exterior applications. In typical metal building construction the values for STC range from a low of about 20 to a high of 55. STC Dec 22, 2022 · Double-glazed glass can also provide an STC rating of up to 40. . The In the past, STC was used as a preliminary comparison of various glazing materials. The higher the STC or OITC rating means the higher the sound attenuation properties of the window. %PDF-1. Pella. NWTL140828-03 STC 40 Assembly Components Finish material 1/ Jun 16, 2023 · Both achieve an STC rating of 40, but higher ratings require a combination. Resilient channel can improve the STC rating of an assembly. 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. 1/4” (6mm) monolithic glass has an STC rating of 31 1/8” x . The soundproofing rating for most standard homes is 33 STC, while soundproofing for studios must be at least 45 STC. 5 fi berglass insulation batts, ⁄8" None TL-92-618 38 5 designed to deliver noise control ⁄8" Glass fi ber TL-93-325 49 5 in metal stud wall May 19, 2023 · This article will explore the six variables that affect STC ratings in walls. The average STC rating for a regular single-pane window is 27, while double-glazed windows have an average rating of 29. octaves below what is considered in determining an STC rating. Example: 6+1. Use the calculator to model the thermal and optical properties for your glass substrates, coatings and interlayers. 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/ May 30, 2024 · STC is a widely recognized measure for sound insulation in windows and doors, focusing on human speech frequencies. STC ratings are the ONLY way to accurately compare various noise reduction products. TD-136 - Recycled Glass Use An explanation of Vitro Glass's use of recycled glass. Additional Technical 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. This rating is based on how much sound is blocked across a range of frequencies, usually from 125 Hz to 4,000 Hz. EN ISO 1288-3 is a useful test for studying laminated glass, including load-bearing capacity (i. It is manufactured by permanently bonding two or more lites of glass with layers of polyvinyl butyral (PVB) interlayer, under heat and pressure, to create a single construction. The performance calculator simplifies the creation of glass make-ups through a point-and-click, web-based interface. 8 operated by Lawrence Berkeley National Laboratory (LBNL) using International Glazing Database (IGDB) v102. While STC and OITC ratings are published for various glass configurations, accurate ratings for the Phone: 888-815-9691. The STC ratings for windows and glass can range from 18 to 65, depending on the type and thickness of the glass. Outdoor-Indoor Transmission Class (OITC) Recently, a new single-number rating has Jun 15, 2024 · STC Ratings for Windows and Glass. Laboratory testing is used to measure the resistance of partitions such as walls, windows, or entry doors to the passage of sound. Glass size and glazing system will affect STC rating. Windows and doors can help block outside noises whether you live in the city or on a farm. As a guide when frames are included, the Rw values shown will decline. 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. 1 It is recommended that ratings calculated in accordance with this classification always be presented together with a graph of the data used for the calculation. These ratings, however The difference in sound levels is used to calculate the STC rating. Laminating glass is a popular way to increase an STC rating. Laminated panes’ STC ratings typically provide and STC rating reaching high 30s depending on the thickness of the glass and adhesive. It’s like the cousin of CAC but focuses on walls instead of ceilings. Typically the material with the lowest resistance to the passage of sound has the greatest impact on a partition's STC value. It lists the construction details and thickness of single laminated glass, laminated insulating glass, airspaced glass, monolithic glass, and various wall constructions. UPDATED; TD-138 - Heat Treated Glass for Architectural Jan 20, 2022 · What Is an STC Rating? The STC rating for walls refers to the “sound transmission class” of your foundation. 24 mm) 1/8" 0. Glass size and glazing system will affect STC rating. Explore noise reducing windows and doors from Pella. 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 E413-87 in an acoustica l wall. Our glazed partitioning systems are tested at a certified laboratory to ensure reliable STC ratings. 75-inch Solid Wood Door Fully Gasketed 31 STC 1. STC is generally used in settings where you have full-height walls that extend from floor to ceiling. Check with your framing system supplier for total window values. 2000 kWh Energy needed to produce the CLIMAPLUS 257 000 kWh Energy savings* (in comparison with a single glazed unit) Optimize energy performance Aim To achieve increasing levels of energy performance beyond the prerequisite standard in order to reduce the assembly. txt) or read online for free. For instance, while 1⁄2” tempered glass may have an STC rating of 36, an office front comprising the same glass with doors might yield an NIC as low as 15, contingent upon the specifics of the glass wall system. It’s important to STC ratings allow to accurately compare noise reduction capabilities by using a single value for the acoustical performance of a door. marshallday. fire-resistance ratings for veneer and conventional systems –Can minimize or eliminate irregularities such as ridging, boarding and nail pops associated with standard drywall Pella 2024 Architectural Design Manual Division 08 – Openings Windows and Doors www. It was created to provide a single number rating for –Veneer plaster partitions achieve up to 63 STC in steel-framed resilient systems and up to 52 STC in wood-framed resilient systems –Have achieved 1- to 4-hr. 25-inch Plate Glass 26 STC . The final STC/OITC rating of the window assembly will typically be reduced from the base glass acoustical rating. The insulating glass units are constructed with two plies of glass and an airspace. Call: (360) 334-4107 Data is based on testing ~36″ x 84″ glass to ASTM E413-87 in an acoustical wall. Email: info@commercial-acoustics. Theoretically, STC ratings have no upper limit in range; however, logically there are some limitations. Glass surfaces are counted from the exterior face of the building. 24 Page 1 of 7 Acoustical Performance of Glass and Wall Constructions Overall Thickness Inside Construction Space Outside STC Value ISO RW 3 1/4" (7. Insulation Calculator. In fact ex-act logarithmic calculated single number ratings are easier with current calculation means, than the old approach, which is much more complicated to put in simple formulae. 25 PSF 1. Presentation of Results 6. 5. Other ratings may be computed using the same worksheet subsituting the appropriate data for the rating instead of the sound transmission loss. 11F P. What is an STC rating? Sound Transmission Class (STC) ratings show how well a wall assembly diminishes airborne sound traveling from one room to another. B. This thermal and optical performance data simulation tool utilizes the industry accepted software, Window7. PVC Jacketing and Fittings. Thinking of STC as "Speech Transmission Class" will help you avoid misusing the STC system. It’s important also to consider: Glass thickness: thicker glass typically provides better sound insulation than does thinner glass 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. 2 Contact Details Marshall Day Acoustics PO Box 5811 Auckland 1141 New Zealand Ph: 64 9 379 7822 Fax:64 9 309 3540 www. STC 43 Assembly Components Finish material 5/8” Gypsum Size 3 5/8” Steel Stud Spacing 16” oc Product AFB Thickness 3. This discrepancy arises because STC ratings the center of glass with no spacer system or framing. Typically a two (2) or more point change 1. The higher the Rw value the better the acoustic performance. Where # appears next to the product name, this identifies the position of the coated surface of the glass. High STC rated windows are designed to minimize sound transmission by incorporating multiple layers of glass, specialized framing, and insulating materials that reduce noise from the outside. STC 50* 15/ 8" (41 mm) steel studs: double layer 1/ 2" (13 mm) Type X gypsum board each side; one system will affect STC rating. 75-inch 2 PSF 4-inch Cinder Block 25 STC 4-inch 25 PSF. † Based on Stats Canada Report CS44-004-IN, April 2013 The performance data below applies to an insulating unit constructed with two plies of glass and an air or argon filled space. The STC and ISO RW values indicate the acoustical performance ratings, with higher numbers indicating better sound 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. 14PVB+16A+6 STC=13. To determine the specific STC ratings of glass and a Technical Glass Guide Update 6/15/21 – Version 3. components. A variety of alternative ratings and calculation methods have been proposed to improve the Unlike other fenestration value requirements, higher glass STC ratings indicated higher performing products. Calculation Example: The Sound Transmission Class (STC) rating is a measure of how well a partition or other building element blocks sound. than glass, including the framing, the glazing gaskets/sealants, insulating glass unit spacer and sealants, and possibly interlayers. The STC rating has been in existence for many years and is based on speech sounds. 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. In addition, proper installation is critical to ensure that sound does not enter through poorly fitted components. 6. Windows significantly impact Sound Transmission Class (STC) ratings because they can either enhance or diminish the overall sound insulation of a building. This performance data is not a commitment for Cardinal to produce. Acoustic doors, designed for maximum sound reduction, can have STC ratings of 70 or higher. rd from outdoor to indoor. com LS-DH-2 Lifestyle Series Double-Hung (—) = Not Available This table compares Vitro Architectural Glass product performance data when assembled in a one-inch (25 mm) insulating glass unit with a ½-inch (13 mm) air space and two ¼-inch (6 mm) lites. *OITC is estimate d base d on this test. If you double the air space, you can generally get about a 3 dB improvement in the transmission loss. 03. In the fi eld, fl anking noise, quality of material and construction practices can lead to widely varied STC’s for the same assembly. V. applied load-glass . 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. Pim Foam or Dura**** 3/32 3/32 - 28 23 4/19/99 TL99-145 Operating Style Series Numbers Glass 1 Glass 2 Spacer STC File Name Solid Glazed Wall STC Rating 3/8" Clear Tempered Glass 36 1/2" Clear Tempered Glass 38 Double Glazed STC Ratings Muraflex Double Glazed solid walls scored industry standards: Solid Double Glazed Wall STC Rating FINO 3/8" Tempered Glass & 1/2" Laminated Glass 43-46 MIMO 3/8" Tempered Glass & 1/2" Laminated Glass 43-46 Glazed Assemblies STC Ratings the center of glass with no spacer system or framing. See additional notes below data for specific 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. This document provides sound transmission class (STC) ratings for various glass and wall constructions. Explanation. • SL45 with STC 40 laminated glass has an STC of 36. Single Number Ratings –STC Intent: a single number rating to compare isolation of different assemblies. 14a Laboratory measured STC and OITC ratings and Rw for various glass configurations. Both STC and OITC ratings inform your window or door selection based on sound insulation JM Formaldehyde-free thermal/acoustical fiber glass batts. com insul@insul. For glazing that is installed within a building interior, the Sound Transmission Class (STC) rating may be a more appropriate measure, as it describes the approximate decibel level reduction for the sound of human speech. 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 OITC* Frequency (Hz) 100 125 160 200 250 315 400 500 630 800 1000 1250 1600 2000 2500 to provide conservative estimates of required STC or Rw ratings to be used by the building designer as a planning tool for window glazing. OITC has replaced STC for comparing glazing materials. Data is based on testing ~36" x 84" glass to ASTM E413-87 in an acoustical wall. Mar 22, 2024 · The calculation of the Sound Transmission Class (STC) rating for glass involves rigorous laboratory testing conducted according to standardized procedures outlined by organizations such as the American Society for Testing and Materials (ASTM). Adding additional layers of drywall can improve the STC rating of an assembly. See full list on elitesafetyglass. significantly improve an IIC rating. Insulation will noticeably improve the STC rating of an assembly. An STC rating is an instrument measurement of how much noise is stopped. annealing float glass is the process of controlled cooling to prevent residual stress in the glass and is an inherent operation of the float glass manufacturing process. This gives some varied answers for sure, which is what is used as part of an average to give an official STC rating. Assemblies will be organized by STC value ranging from an STC of 40 to an STC of 57. Our insulating glass units are meticulously assembled with two panes of glass, separated by an air space, to ensure A3000 Series Sliding Glass Doors (1) Restorations Series V5500 (1) STC Ratings (2)Zip file Installation Instructions (5)Zip file. 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. STC ratings provide valuable information for homeowners by offering them better insight into the STC ratings are used for windows, doors, walls and most building materials. Factors That Affect Your Glass STC Rating. If only one or two types of frequencies are predominant in an area, the overall STC rating might not matter as much. Laminated Glass Applications Values are center of glass calculated using LBNL Window 7 per NFRC100 conditions. 060 P. All performance data is calculated using LBNL Window 7. 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. Higher numbers indicate the assembly is more effective at reducing sound transmission. These tests are defined in EN ISO 1288-3 stan-dards and ASTM C158. mathematical point of view, taking the nowadays calculation means into account. Registered Office: Saint-Gobain House, East Leake, Loughborough, Leicestershire, LE12 6JU. Actual values may vary due to production tolerances. pdf), Text File (. 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. jm. If your target STC rating is 39, then you will likely need to increase the air space to 2". Acoustical Guide – Determining Minimum STC Rating Figure 1. VAT Number GB 544 939 018. For example, MLV has an STC rating of around 27. Address: 6301 N Florida Ave Tampa, FL 33604 Sound Attenuation Batt Insulation Product Data Sheet Description Acoustic Comparison of Cavity Insulation Types Sound Attenuation Batts (SAB’s) Gypsum Board Insulation Type Test Number STC are unfaced, lightweight, fl exible One layer each side. 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 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. Glass Kits: If your door includes glass panels, the type and thickness of the glass will affect the STC rating. Laminated & Double-Glaze Combinations. 9 mm) 1/2" 0. These single-number ratings correlate in a general way with subjective impressions of sound transmission for speech, radio, television, and similar sources of noise in offices and buildings. The higher the STC rating, the better the sound ALUR GLASS WALL GLASS THICKNESS AIR SPACE STC VALUE MONOLITHIC GLASS 1/2” Monolithic N/A 36 LAMINATED GLASS 1/2” w/PVB Interlayer 1/2” w/Sound Control PVB Interlayer N/A N/A 38 39 DUO GLASS WALL (SINGLE PANE) MONOLITHIC GLASS 3/8” Monolithic N/A 34 LAMINATED GLASS -Estimated STC Ranges should be adequate REPRESENTATIVE STC RATINGS Considerations for additional performance More air gap between windows Caulk or seal prime window Special weather-stripping for storm window Single Glazed ¼” Laminated Glass 41 - 45 Single Glazed 3/16” Laminated Glass 40 - 44 Single Glazed 1/8” Glass 31 - 37 *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. Laminated and double-glazed glass both hold STC ratings of 40, but anything higher typically requires a combination of the two. 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. com. Not all walls are the same, especially in terms of composition and material. It is the user’s responsibility to Jul 4, 2024 · STC. Then easily create client-ready reports comparing glass options. (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. 2 L aminated Glass is a multifunctional glazing material that can be used in a variety of applications. [ ] Review and Interpret Results: Analyze the STC rating to ensure it meets your soundproofing needs. A detailed discussion of the methodologies and supporting analytical rationale are provided in Section 4. • SL80/81 has an STC rating of 38 when using double insulated laminated STC 38 glass, and a rating of 45 when using double laminated STC 45 glass. STC rating (Sound Transmission Class rating) is a score given to a building’s surface (wall, ceiling, window, etc. 75-inch Hollow Core Work Door No Gaskets 19 STC 1. The STC (Sound Transmission Class) rating is a single-number rating system for interior building partitions and viewing glass constructions only. Compare the E413-87 in an ac oust ical wall. Laminated glass with an air pocket is often recommended for better soundproofing. Class (STC) rating. ) based on its ability to reduce sound coming through it. STC rating goes from 25 – 65. However, soundproof windows can have an STC rating of 48-54 or higher Oct 20, 2024 · This calculator provides the calculation of Sound Transmission Loss (STL) for a given Sound Transmission Class (STC) rating and frequency. Jan 18, 2022 · STC Ratings Updated : 01/18/2022 by K. 3 software and represents center of glass performance data. Limitations: To determine the STC rating of a wall in a lab, they can test out frequencies from 125 Hz to 4000 Hz. Table 1 suggests STC criteria for various office areas, and can be used as a guide for choosing appropriate criteria for sound insulation between adjacent office spaces. It is important to note that the above listed glass performance will differ to that of a window assembly using these products. A large amount of glazing configurations means the perfect glass can be yours. 5” Acoustics Assembly Number: ISS-02 STC: 43 OITC: 28 Report No. 1/8" 35 35 *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 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. *OITC is estimated based on this test. com glass configurations. 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. Mass pigmented and decorative interlayers can also be used to provide a wide range of effects. 5*lg(6*2. annealed glass can be cut, machined, drilled, edged and polished. 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. 75-inch 7 PSF. STC Ratings Chart Acoustical Performance of Glass and Wall Constructions Overall Thickness Inside Glass 1 3/4" (19. stress behavior and laminate deflection behavior). Acoustical Assemblies STC Rating Reference Guide. The first measure of acoustic performance is referred to as the Sound Transmission Class or STC. Save as PDF 800 Park Drive , Owatonna , MN 55060 US | (800) 533-2080 float glass (also called “flat” glass) that has not been heat-strengthened or tempered is annealed glass. It is the user’s responsibility to stress properties of laminated glass and monolithic tempe - red glass. Visit our website atwww. 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 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. cpw cmcm rhvy fswfbtp fphbc awa hvbuy gyu hvsu qyaac cswli ltc muljlh ayklo asjl