Stc glass rating chart Including an Argon or Krypton gas fill in the air space does not make a measurable difference to the STC rating. three different glass configurations. As the table shows, a single pane 1/4” annealed curtain wall window has a STC rating of only 31 and an OITC rating of 28. How to Increase Window STC Rating. Of course, the higher the STC rating, the better. Argon fill is 90% and air fill is 100%. Thermolite Sound Transmission Loss Test Report Results Window STC Rating Chart. Actual values may vary due to production tolerances. Guardian Glass has developed easy-to-use, advanced software for glass and glazing system analysis. Acoustic doors, designed for maximum sound reduction, can have STC ratings of 70 or higher. Assemblies will be organized by STC value ranging from an STC of 40 to an STC of 57. A rating increase from 24 to 33 corresponds to a 95% of noise reduction. A leader in tools for the glass industry. For windows, STC ratings range from 18 to 38. A SPW using 1/4" laminated glass A SPW using 5/8" laminated glass All tests were performed by Western Electro-Acoustic Laboratory (WEAL), a fully accredited Oct 18, 2023 · How to Read an OITC Rating Chart. Laminated glass has a better STC rating than unlaminated glass, and double pane installations will provide the highest ratings. Typically a two (2) or more point change Check the STC rating chart above to have a better understanding of this. This rating can be considered the baseline from where you are getting serious when it comes to preventing some transmission. Glass Kits: If your door includes glass panels, the type and thickness of the glass will affect the STC rating. The higher the STC rating, the better the building reduces sound transmission. Lab results are highly controlled and may not reflect the same performance in the field based on the conditions of your environment. Drywall between double studs can dramatically reduce the STC rating of an assembly. But what does that really mean? A sound transmission class chart is a simple way to understand the decibel scale and its relation to STC ratings. STC/OITC: G3302. -1/8" (total 3/8" thick), 1/4"-0. STC Rating Chart. Each configuration was tested by itself and then with the added Soundproof Window at 4 different air spaces (glass to glass measurements) shown to the right. Lower Range Up to STC 35. Laminated and double-glazed glass both hold STC ratings of 40, but anything higher typically requires a combination of the two. 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. 03. STC ratings are the ONLY way to accurately compare various noise reduction products. Noise is one of the single most common complaints at hotels, condos, and other commercial properties. Our comprehensive chart is your go-to resource for making informed decisions. Jan 28, 2024 · The average STC rating for a regular single pane window is 27. 17. Acoustical Performance of Glass and Wall Constructions. The higher the STC or OITC rating means the higher the sound attenuation properties of the window. It’s important also to consider: Glass thickness: thicker glass typically provides better sound insulation than does thinner glass Laminating glass is a popular way to increase an STC rating. Factors That Affect Your Glass STC Rating. 7 mm) 1/2" laminate 4", Air 1/4" laminate 51 51 Dec 22, 2022 · Double-glazed glass can also provide an STC rating of up to 40. Mar 22, 2022 · Simply put, STC ratings measure sound level on one side of a wall, versus the other side of a wall. This performance data is not a commitment for Cardinal to produce. Double-glazed glass can also achieve an STC rating of up to 40. The OITC (Outside-Inside Transmission Class) rating is used to classify acoustic performance of glazing in exterior applications. ) versus the other side of a building’s surface. Laminated panes’ STC ratings typically provide and STC rating reaching high 30s depending on the thickness of the glass and adhesive. Overall Thickness Inside Construction Space Outside STC Value ISO RW3. STC Rating Chart Determining STC Rating of Wall, Drywall, and Windows STC Rating of Drywall. It includes STC ratings for commonly used materials such as: Oldcastle STC Data (1) The data here is based on samples tested at Riverbank Acoustical Laboratories in accordance with ASTM E90- 97, ASTM E413-87 and ASTM E1332-90 and are not guaranteed for all samples or applications. Class (STC) rating. stops sound. WE STAND BEHIND OUR GLASS WinGuard® Aluminum products are backed by some of the best warranties in the industry, including: • A 10-year warranty on the frame and laminated glass unit • Limited lifetime warranty on the insulating glass unit What is STC? STC ratings measure sound level on one side of a building’s surface (wall, ceiling, window, etc. The STC and ISO RW values indicate the acoustical performance ratings, with higher numbers indicating better sound Jan 18, 2022 · STC Ratings Updated : 01/18/2022 by K. Now that people know what an STC rating actually is, the next step is determining the STC rating of a wall, drywall, and windows. Refers to a window manufactured by Soundproof Windows, Inc. STC is widely used to rate interior partitions, ceilings/floors, doors, and windows. 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 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. At JELD-WEN, for example, we 400 Series Frenchwood® Hinged Patio Door Hardware (Trim Set) Exploded View glass constructions only. Adding additional layers of drywall can improve the STC rating of an assembly. That being said, anything below an STC rating of 40 might garner comments about paper thin walls. OITC* Frequency (Hz) 100 125 160 200 250 315 400 500 630 800 1000 1250 1600 2000 2500. Resilient channel can improve the STC rating of an assembly. OITC . Performance targets are selected based on acoustic ratings, and results are revealed immediately. Quite simply, the higher the rating, the better the product. In the U. Sep 21, 2018 · When looking at STC ratings for windows and doors be aware that the glass manufacturers publish values for the glass they produce. Beyond the type of windows you select, other factors can affect the STC rating of your glass. 24 Page 1 of 7 STC Rating Chart. It should be noted that STC ratings obtained in a lab may be different than those achieved in real-world applications. Email: info@commercial-acoustics. [3] The STC provides a standardized way to compare products such as doors and windows made by competing manufacturers. 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. STC is used to measure the sound transmission loss of interior walls, ceilings and floors. 5. There are different ways to improve the STC rating of windows. With either scale (the OITC scale for exterior glazing or the STC scale for interior glazing) a performance rating of 30, for instance, Feb 19, 2024 · Explore the STC rating chart for walls, glass, windows, doors, and materials. After a 1/4” Thermolite sound control window was placed behind the same window, the STC rating improved to 43 and the OITC rating improved to 33. *OITC is estimated based on this test. 1. Save as PDF 800 Park Drive , Owatonna , MN 55060 US | (800) 533-2080 Glass 3 Spacer STC OITC Test Date Test Number Operating Style Series Numbers Tested Size OA Glass 1 Glass 2 Acoustical Ratings - Trinsic I V300 updated 04. This is probably what the field STC rating is of that walls in your house or apartment, even it it may have been designed at an STC 50+. 030" P. The cost, however, may be prohibitive. Understanding STC We sent our solid and glass walls to get Sound Transmission Class (STC) ratings from labs that follow the American Society of Testing and Materials (ASTM) E90 test procedures. When tested in the field, an STC rating of a wall assembly will almost always be lower than the lab May 22, 2022 · Commonly called acoustic laminated insulated glass, the windows provide an STC of 39 to 54 or greater. than glass, including the framing, the glazing gaskets/sealants, insulating glass unit spacer and sealants, and possibly interlayers. S. May 18, 2023 · Sound Transmission Class ratings, commonly referred to as an STC rating, is an integer rating that details how well a building partition reduces airborne sound waves. 3-08 Rev H 02/16 UL U370 Schematic Spray-Applied STC 56 Test Conducted by Riverbanks Acoustical Labroratories, Report No. High Range STC 43 - 45. 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. Overall . Even if the glass is damaged, it remains securely in its frame, keeping the elements outside. Laminated & Double-Glaze Combinations. Feb 19, 2024 · Explore the STC rating chart for walls, glass, windows, doors, and materials. Riot Glass® is a full line of ballistic glass available in single and dual pane options. A wider gap provides better sound insulation by minimizing direct sound transmission. The tested STC ratings were less than the manufacturer's published STC ratings. –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. If thicker glass material is used, the rating can go up to 35. This is different from the rating of that same glass once included into a window frame. These Dec 31, 2024 · Gaps or weaknesses in the frame can compromise the STC rating. Explore noise reducing windows and doors from Pella. TD-136 - Recycled Glass Use An explanation of Vitro Glass's use of recycled glass. This might seem a little difficult to do, but as long as a person has somewhat of an idea on how the ratings work, it is a Windows and doors can help block outside noises whether you live in the city or on a farm. 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 STC Rating STC Rating Static Door Operable Door Perimeter Seals Door Bottom Threshold Panel w/ Gasketing 30 30 103N, 107N, 120N, 122N 420N 897NS 127N, 133N, 134N, 137N 137S, 303N, 700N, 700S 30 30 130S 225S 896S 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. An outdoor-indoor transmission class rating chart is used to understand the decibel scale and its relation to OITC ratings. Learn why STC ratings matter for soundproofing. 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. 05-113-11-R1 Rainfall: G3302. Specific products for these building materials will vary, so talk to the manufacturer to get the exact STC rating before purchasing. Typical dual glazed windows can achieve better ratings of 25-27. Values are center of glass calculated using LBNL Window 7 per NFRC100 conditions. 1. Heat efficiency usually requires a maximum gap of 16 millimeters, but a larger space is always better for soundproofing. These independent tests confirm that Falkbuilt delivers superior acoustic performance. Typically the material with the lowest resistance to the passage of sound has the greatest impact on a partition's STC value. No frames are utilized in the testing to ensure accurate comparison of the glass configuration can be made without external STC Results Chart. While STC and OITC ratings are published for various glass configurations, accurate ratings for the 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. STC ratings tell you how well a wall, window, ceiling, door, etc. Even then, differences of 1-2 points STC can occur for the same assembly in the same laboratory. Calculate What You Need for the Improvements You Want. The frequencies used in STC ratings correlate in a general way with subjective impressions of sound When planning your acoustics—especially in environments like conference rooms or medical facilities where sensitive information is discussed—knowing the STC ratings of different materials is crucial. Costing more than other materials, this is used mainly for exterior applications. 0 This guide provides an introductory overview of glass concepts and terminology, plus Performance documents for altitude limits, NFRC ratings, center of glass, joining window load table, air infiltration, and more. 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. Sound Transmission Class ratings. What does an STC rating of 45 mean? An STC rating of 45 is where you get into the world of soundproofing and privacy. Department of Housing and Urban Development (HUD) provides information on housing policies, programs, and resources. Data is based on testing ~36" x 84" glass to ASTM E413-87 in an acoustical wall. Fortunately, there are some tools we can use when we choosing the suitable glass types we need. Learn more. … Values are center of glass calculated using LBNL Window 7 per NFRC100 conditions. In addition, proper installation is critical to ensure that sound does not enter through poorly fitted components. 4. Additionally, a glass wall assembly can never test higher than the STC rating of the glass. Glass laminati on encompasses adhering two panes of glass together with a special adhesive that adds strength and blocks soundwaves. STC 43 Assembly Components Finish material 5/8” Gypsum Size 3 5/8” Steel Stud Spacing 16” oc Product AFB Thickness 3. Our spec sheets offer a detailed look at individual products, and include information on product features, options, and performance data. The STC rating figure represents approximately the decibel reduction in noise that the assembly can provide. Click here to review the full details. 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. -1/4" (total 1/2" thick), 1/4"-0. Consider not only the STC rating but also door quality and construction. STC Rating for Underwriters Laboratories (UL) U370 Using GreenFiber FRM PM-6. 70 60 --STC38 A higher STC rating translates into more reduction in sound. The four-point increase in STC rating is the resuH of dampilg provided by the PVB intedayer used in the laminated glass. , it is widely used to rate interior partitions, ceilings, floors, doors, windows and exterior wall configurations. To determine the specific STC ratings of glass and a Oct 10, 2024 · STC RATING CHART: STC: What can be heard at this level: 25: Soft speech can heard and understood: 30: Normal speech can heard and understood: 35: Loud speech can heard and understood: 40: Loud speech can heard, but not understood: 45: The threshold at which privacy begins: 50: Loud sound can be heard, but are very faint: 60+ At this level, good The performance data below applies to an insulating unit constructed with two plies of glass and an air or argon filled space. Laminated glass Formula: R+13. Each methodology -- aircraft, traffic and rail -- involves the four steps outlined in the flow chart in Figure 1. In the fi eld, fl anking noise, quality of material and construction practices can lead to widely varied STC’s for the same assembly. B. OA Glass 1 Glass 2 Acoustical Ratings - Ultra I C650 updated 04. Oct 28, 2024 · Quanex’s Super Spacer® Standard, featuring polymer EPDM (Ethylene-propylene-diene-monomer) construction, dependably delivers high performance for insulating glass (IG) units, including excellent resistance to ozone, weathering, water and aging, while maintaining its flexibility through wide changes in temperature and barometric pressure. Old aluminum and wood windows are rated even lower. NWTL140828-03 STC 40 Assembly Components Finish material 1/ STC ratings are determined in a laboratory under controlled conditions. 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. An example of a window STC rating chart is as follows: 26-28 – single pane window; 26-32 – double pane window; 48-54 – soundproof window over a single pane window Mar 21, 2024 · Air Pocket Between Glass Panes: The distance between the two panes of glass in double-glazed units affects STC. -1/8" (total 1/4" thick), 1/4"-0. Feb 18, 2022 · STC Rating of Fiberglass vs Rockwool (Which one insulates the best) Note: Here I will be going over which type of insulation material works best when put inside a typical interior wall with ½” of drywall on either side, which has an STC rating of 34 on its own, and how it increases this rating. 6. On the The STC or sound transmission class is a single number method of rating how well wall partitions reduce sound transmission. 24 Page 1 of 7 Glass 3 Spacer STC OITC Test Date Test Number Operating Style Series Numbers For simplification, we have segmented NanaWall sound-rated opening glass wall solutions into three categories. 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 higher the STC rating, the better the sound isolation. Rating. winds. 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. However, architectural acoustics can often become a bewildering array of alphabet soups (STC, OITC, and IIC, to name a few!), and even acoustically experienced architects and designers can be left scratching their heads. AGC Glass Configurator Single & Laminated Glass Data. Meets or Exceeds AAMA / WDMA Ratings: C - LC +50 / -50 Missle C, Windzone 2 STC. Heavier glass and/or different glass thicknesses can be used in lieu of standard glass for a higher reduction of sound. Insulation will noticeably improve the STC rating of an assembly. 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. Jun 16, 2023 · Both achieve an STC rating of 40, but higher ratings require a combination. What Is a Good STC Rating? An excellent rating is an STC of 60 or higher. May 30, 2024 · STC is a widely recognized measure for sound insulation in windows and doors, focusing on human speech frequencies. Jul 5, 2023 · Thinner glass has a low STC rating because sound travels through it easily. Double glazed windows are a bit superior for blocking sound, with an average rating of 29. 87dB. OITC, on the other hand, covers a broader frequency range (80 to 4000 Hz), including lower frequencies often associated with external noise. Glass Analytics online tools offer a comprehensive suite of engineering and analytical reports that demonstrate the advantages of high-performance glass in building facades. 15-113-11-R0 STC 31 26 STC 25 to 35 RWT31 RWT36 RWT30 Sound transmission class (STC) is a single number rating of sound isolation of a building wall assembly. 22. Laboratory testing is used to measure the resistance of partitions such as walls, windows, or entry doors to the passage of sound. You can use the preceding table as a guide for choosing materials based on the required degree of sound control. All performance data is calculated using LBNL Window 7. Transmission Class (STC) rating may be a more appropriate measure, as it describes the approximate decibel level reduction for the sound of human speech. All data presented is for glass-only testing. Call us with any questions! 1/4” (6mm) monolithic glass has an STC rating of 31 1/8” x . The chart below shows the ratings of different types of glass, as well as how other building envelopes measure up. 5)+13=28. 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). 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. 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 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. In the US, it is widely used to rate interior partitions, such as demountable walls and/or glass walls, ceilings/floors, doors, windows and exterior wall configurations. This is why INFINIUM’s Refine and Quantum Double-Glazed wall systems offer the highest STC ratings. An STC rating is an instrument measurement of how much noise is stopped. May 14, 2021 · It is hard for us to know how much DB noise has been blocked during transmission. Technical Glass Guide Update 6/15/21 – Version 3. The STC ratings allow accurate 'apple to apple' comparisons. At this rating, you may be able to hear very loud sounds faintly, but most sounds you won’t hear at all. components. Both STC and OITC ratings inform your window or door selection based on sound insulation Sound transmission class (STC) ratings solve that problem by giving a single value to acoustical performance for a door. A higher sound transmission class rating indicates more effective sound insulation than a lower number. Most of the time, an assembly’s OITC rating is lower than an STC rating. RAL-TL06-199 The acoustical tests were conducted in accordance with the following: STC Sound Transmission Class (or STC) is an integer rating of how well a building partition attenuates airborne sound. Our retrofit framing allows us to install the ArmorPlast® into your existing framing to significantly reduce costs and downtime. Calculating the required improvement involves subtracting the target STC rating from the existing STC STC RANGE 25 - 35 Roof Membranes Unless otherwise indicated, all tests have been completed to be membrane agnostic. See additional notes below data for specific 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. Glass size and glazing system will affect STC rating. Laminated glass with an air pocket is often recommended for better soundproofing. 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. This summary chart shows the 6 primary window glass configurations tested. STC ratings are used for windows, doors, walls and most building materials. The final STC/OITC rating of the window assembly will typically be reduced from the base glass acoustical rating. Address: 6301 N Florida Ave Tampa, FL 33604 Here we introduce a simple formula to calculate the glass STC-sound transmission class. 5” Acoustics Assembly Number: ISS-02 STC: 43 OITC: 28 Report No. Lab Proven STC Ratings When deciding what STC rating you should specify; use the following chart to in light your decision: STC: 1/4" plate glass: 32: 1/2" plate glass: 38: The gap between lites also provides acoustic insulation, to improve STC ratings. STC 30 if you live in an average area but want more privacy, STC 35 is the go to in louder areas, STC 37 if in a louder area and you want a luxury feel or you are pretty close to the airport or overlooking the freeway, STC 40+ is either you live in an area that is obnoxiously loud (seldom the case for single family housing) or you don't want to . 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. Products with Impact-Resistant Laminated Glass. UPDATED; TD-138 - Heat Treated Glass for Architectural SoundPro calculates glass usage by performance or glazing configuration. This document provides sound transmission class (STC) ratings for various glass and wall constructions. 3 software and represents center of glass performance data. Sound Transmission Class (STC ) is an integer rating of how well a building partition attenuates airborne sound. 24 Page 1 of 2 Due to continual product research and development, details listed are subject to change at any time Acoustical Guide – Determining Minimum STC Rating Methods for Determining Required Window STC Rating The three methodologies discussed below for determining the minimum required STC of windows are identical in format. A higher sound transmission class rating indicates more effective sound insulation than a lower rating. Monolithic glass Formula: R=13. 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. When planning glass wall systems, here’s a -114• glass) with an STC rating of 34. 24 This rating is especially important to architects since it can have the largest impact on building performance. 5*lg(6*2. 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. The STC (Sound Transmission Class) is a rating system for interior building partitions and viewing windows used to Triple Insulating Glass Construction STC OITC VT's Sound-Resistant STC Doors. Select materials for sound absorption according to their STC ratings. Seals and Gasketing: Even the highest-rated door will perform poorly without effective The U. 1-7/8" overall - 1/4" glass, 1/2" airspace, 1/4" glass, 1/2" STC. Nov 7, 2016 · Looking at the chart above, once a wall gets to an STC of 45, loud speech is audible but not understandable. 800-782-5742 Talk to an expert! STC Ratings Chart Acoustical Performance of Glass and Wall Constructions Inside Construction Space Outside STC Value ISO RW 3 Single Laminated Glass 1 1/4" (7. com. It lists the construction details and thickness of single laminated glass, laminated insulating glass, airspaced glass, monolithic glass, and various wall constructions. Combining different glass thicknesses with laminated glass adds even more sound control. A typical STC rating chart will often include an example of materials with a given STC rating, and the sounds you can expect to hear given the STC rating. Phone: 888-815-9691. Rating Dec 7, 2023 · Through acoustic testing, you’ve determined an assembly has an STC rating of 50. fire-resistance ratings for veneer and conventional systems –Can minimize or eliminate irregularities such as ridging, boarding and nail pops associated with standard drywall Standard windows offer sound control up to an STC rating of 30. Double-Glazed STC Ratings Chart Acoustical Performance of Glass and Wall Constructions Overall Glass 2 4-3/4" (120. The higher the STC rating, the more sound will be dampened. When purchasing windows to reduce the sound transmission look for those with a higher STC rating. Glass size and glazing system will affect STC rating. Tested under ASTM E90, laminated outside pane consisted of either 1/8"-0. 5lgM+13 R:Monolithic glass STC M:Glass density. The STC (Sound Transmission Class) rating is a single-number rating system for interior building partitions and viewing windows used to categorize acoustic performance. Mass pigmented and decorative interlayers can also be used to provide a wide range of effects. Mid Range STC 36 - 42. 5lg(M1+M2)+13+R1 R:laminated glass STC M1,M2:Glass panel density Jul 31, 2022 · Glass doors can range from 28 to 60+ STC ratings, while steel and fiberglass doors range from 20 to 50. Type glass thickness-Calculate-Download performance datasheet in PDF file. V. 2. Read more about the tools below Armorplast® and Riot Glass® ArmorPlast® is designed to resist penetration in UL752 Levels 1, 3 and 6. 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. -1/2" (total 3/4" thick), panels caulked in place in single frame with wooden stops and glazing putty. For this reason, STC (Sound Transmission Class) ratings have become a primary consideration when choosing doors for large-scale projects. Example:6mm clear tempered glass STC=13.
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