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Stc rating chart Insulating plumbing walls can stop the dreaded toilet flush noise and help maintain privacy. In multi The topic is best addressed by talking about Sound Transmission Class (STC) ratings. The STC rating goes all the way up to 65. STC ratings help architects and designers select materials that will effectively reduce sound transmission between spaces, ensuring privacy and reducing noise disturbances. 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 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. The overall STC rating is an average of the Looking at the chart above, once a wall gets to an STC of 45, loud speech is audible but not understandable. Open Cell Foam - Full Cavity. Determine Target STCs. STC 40-50: You can hear some muffled sounds, but not specific words. 1. J2247-13-303-11-R0 Insulation Included: ROCKWOOL AFB Interior While no specific STC rating defines a partition as “soundproof” in an absolute sense, higher STC ratings generally indicate better soundproofing performance. Special consideration must be given to spaces where the noise transfer concern is other than speech, such as mechanical STC 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 Check the STC rating chart above to have a better understanding of this. Building Code of Australia (BCA) Requirements . The STC rating for a basic wood structure floor/ceiling is STC 40-43. Often times, specialty insulations do not perform any better than standard batt insulation. OITC ratings are generally lower than STC ratings because the results are in decibels rather than the STC point system. Board. Key Concepts to IIC Ratings Chart IIC Ratings vary dramatically depending on finish floor, subfloor, ceiling structure below, and of course, use of an IIC-rated sound mat. . J2247-13-303-11-R0 Insulation Included: ROCKWOOL AFB Interior 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 for Load-Bearing Walls. However, when building hotels, the STC of 55 for demising walls and STC 50 for corridor walls isn’t a building code requirement – this is what we call a “brand How It Works: Airborne noise travels through air gaps and weak points in walls and floors. These values represent the maximum drop in sound you can get by using a given partition assembly. The table below shows typical window STC rating values for single pane windows and dual pane windows, and the resulting STC rating when Soundproof Windows are installed over both single pane windows and dual pane windows. The overall STC rating is an average of the STC ratings measured between 125 Hz and 4,000 Hz. What’s not on this chart: comparisons for using other types of drywall (like QuietRock ), or more airborne noise control rating. 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. Metal Building Insulation . STC Rated Wall Assemblies. 125 (2,002)For multi-wythe walls where both wythes are The STC rating is a single-number rating used to measure the sound insulation provided by walls, floors, ceilings, and other barriers. Nothing is completely soundproof. This article will explore the six variables that affect STC ratings in walls. Metal studs –Can increase the STC rating of a double-layer, steel-framed partition from 29 to 53 STC –An integral part of high-performance CGC partition designs for attenuation of low-frequency sound from machinery and music –Suitable for use at the perimeter of fire-rated wall assemblies MICORE® Mineral Fibre Board ® ™ For more information see the following brochure: of . Ratings must be determined in accordance with CAN/ULC-S101-14, “Fire Endurance The table below summarizes the STC rating ranges for different types of doors: Type of Door: STC Rating Range: Interior/Hollow: 25 or less: Solid Wood/Solid Core: 30-45: Hollow Metal: 20-35: MDF: 30-50: Glass: 28-60+ Steel: 40-50: Fiberglass: 20-30 (standard) or higher (specialty) Acoustic: 70+ Choosing the right soundproof door is crucial for achieving the It provides an objective measurement of a material’s or assembly’s ability to block airborne sounds like voices, music, or traffic noise. 34 25 Mineral Wool R-15. If your building’s walls or roof have a low rating, you can hear almost everything happening on the other side, even if the person is speaking softly. When viewing the chart on a mobile device STC Rating Chart. NIC [] 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. The STC rating figure represents approximately the decibel reduction in noise that the assembly can provide. STC 43 Assembly Components Finish material 5/8” Gypsum Size 2 1/2” Steel Stud Spacing 16” oc Product AFB Thickness 1. With STC ratings as high as 56* in a standard 2 x 4 wall assembly Rockwool Premium Plus™ Insulation has set the standards high. V400 | Tuscany® Series Acoustical Ratings rigid non-rigid Intercept / Cardinal Foam / 4SG / Dura**** Glass 3 includes both STC and OITC ratings for steel and wood stud walls, considering both interior and exterior assemblies. But what does that really mean? A sound transmission class chart is a %PDF-1. For example, loud speech can be understood fairly well through an STC 30 wall but should not be audible through an STC 60 wall. Constructing a new house, means you could use a batt or spray foam. Of course, the higher the STC rating, the better. Sound Reduction Index (SRI) ISO index or Adding mass to the walls, and decoupling will increase your rating. The first column is the rating of the door panel only; tested in a static inoperable condition to determine the sound transmission through the door. STC ratings are used for pretty much all the components of a building envelope Demystifying STC Ratings (STC-35, STC-45, STC-52) When clients come to us looking for soundproof control rooms, operator cabins and acoustic enclosures, we ask about the sound attenuation they need for their project (STC-35, STC-45 or STC-52+). The STC wall rating chart measures between 45 STC Rating Chart Determining STC Rating of Wall, Drywall, and Windows STC Rating of Drywall. • Implications: More flexibility for the designer. The two ways acoustic isolation ratings are tested: in the field or in the lab. A standard guideline is that a sound transmission class rating of 40 or above is adequate for most residential applications, where everyday speech can barely be heard through the partition. The joints on the STC ratings beyond the basics described on page 1, it’s important to have a working understanding of decibels, transmission loss, and frequency. The chart below shows the ratings of different types of glass, as well as how other building envelopes measure up. 1/8" 35 35 The U. Sound transmission reduction In single-stud walls, the most cost-effective sound control upgrade is to double the drywall on one side and add insulation to the cavity, increasing the sound transmission class (STC) from 33 to 40 (See Table of STC ratings of typical wall assemblies at left - click to enlarge the table). The STC rating chart provides a visual representation of the sound transmission class ratings for different materials, illustrating the amount of sound transmission being reduced and the frequencies of sound being affected. Common Wall STCs by Construction Type. 33. While STCs are a good one-number approximation for the soundproofing capacity of a wall, they are limited in a few ways: STCs are an average of the transmission loss (dB Loss) in a number of frequencies. Because the best-fit equation is based solely on wall weight, the calculation tends to underestimate the STC of masonry walls that incorporate dead air spaces, which contribute to sound attenuation. * The field test evaluates the dwelling's actual construction and includes all sound paths. ” It is either STC Rated, or it is not. There is plenty of information out there at our fingertips, but it's important to get a full picture. Duct Wrap . STC ratings are pretty straightforward. Load Scenario. What is Sound Transmission Class — or STC ? In a nutshell, Sound Transmission Class ratings (STC) are an industry accepted method to average how much sound is stopped by something. Elevated Temperature . Outdoor Indoor Transmission Class criteria are more appropriate than STC for façade evaluation, but test data are sparse • Resolution: 2010 Guidelines listed STC, 2014 Guidelines listed OITC, 2018 will list both providing guidance on how to select. 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. 6 %âãÏÓ 101 0 obj > endobj 136 0 obj >/Filter/FlateDecode/ID[3324F964CBA44CA8AC3884D61CCD6213>]/Index[101 61]/Info 100 0 R/Length 150/Prev 2009558/Root 102 How to Read an OITC Rating Chart. OITC. Fiberglass R-13 Unfaced. The table below displays the Understanding a material’s Sound Transmission Class (STC) rating is essential for blocking sound effectively in your space. Style Line® Series | V250 Windows STC Ratings Updated : 01/18/2022 by K. UBC requirements for floor/ceiling assemblies: STC ratings of 50 (if tested in a laboratory) or 45 (if tested in the field*). The higher the STC rating, the better the sound isolation. An assembly rated at STC 50 will satisfy the building code Each manufacturer of open cell spray foam has a different STC rating. Premium sound mats may be needed under hard surfaces, even when concrete Use this chart to find the right product. Save Scenario. Installing insulation within a wall or floor/ceiling cavity will improve the STC rating by about 4-6 dB, which is clearly noticeable. Simply doubling the amount of studs (two-‐packs) does not add mass across the wall, and therefore, does not improve the STC. Batts. The following chart gives some qualitative intuition for what you can expect from different STC ratings. The STC rating for STC Ratings Chart Acoustical Performance of Glass and Wall Constructions Overall Thickness Inside Construction Space Outside STC Value ISO RW 3 STC is a rating of how well a building partition attenuates airborne sound. 5 %¡³Å× 1 0 obj >>>/Type/Catalog/Metadata 59 0 R >> endobj 9 0 obj >/Properties >/XObject >/ExtGState >/ProcSet[/PDF/Text/ImageC/ImageI]/Font >>>/Thumb 19 STC, or Sound Transmission Class, is a measurement that indicates how effectively a material or structure reduces sound transmission. Title: Noise Barriers STC Rating Guide Created Date: 4/21/2023 8:46:17 AM Reported STC values are found by doing transmission loss tests on a fully built assemblies in a lab. The STC 30 rating is calculated at the 500 Hz frequency after Recommended STC Ratings on Corridor & Demising Walls. The lab and UBC requirements for walls: STC rating of 50 (if tested in a laboratory) or 45 (if tested in the field*). This sound rating increases to STC 42-45 with steel studs. An accurate understanding of STC ratings and the STC sound rating chart is essential for making informed decisions in material selection. Acoustical Guide – Determining Minimum STC Rating Figure 1. Pipe and Tank . Adding mass only “counts” if it across the entire partition, such as adding a layer of drywall or thickness to a concrete wall. Higher STC values are more efficient in reducing sound transmission. 125-4000 Hz is consistent with the frequency range of speech. 1) Figure 1—Sealing Wall Intersections & Control Joints. 33 25 Closed Cell Foam - Full Cavity. These ratings, however Here’s what different STC ratings mean for your soundproofing needs: STC 25-30: Normal speech can be heard clearly through the barrier. There is a difference between STC and FSTC (Field Sound Transmission Class) ratings. Air Sealant. Most of the time, an assembly’s OITC rating is lower than an STC rating. Find out the STC ratings of common materials and how to calculate the amount of sound absorption material you need. The window has its own STC rating though, typically averaging about 30. Window Glass: Normal STC Range: Typical Value: Single pane glass : 26-28: 27: Dual pane glass: 26-32: 26: Referring to the typical STC 30 rating chart below, STC is determined by testing sound transmission decibel loss at 16 standard frequencies from 125 to 4000 Hertz (Hz). Its origina l intent was to quantify File Name: STC Ratings - Style Line | V250 Due to continual product research and development, details listed are subject to change at any time. Here is It contains STC (Sound Transmission Class) or HC (Impact Insulation Class) ratings for approximately 500 different construction assemblies. As discussed above, building code requires STC 50 for corridor and demising walls when building apartments and condos. The STC rating figures reflect the decibel reduction in noise that a partition can provide. Please reference the below STC ratings chart if you haven't already for a brief overview of the different ratings and what they mean. 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 Sound transmission class (STC) ratings solve that problem by giving a single value to acoustical performance for a door. 3. ASTM Standards define the procedures and methodology for calculating STC (E901 for Laboratory Test Methods and E4132 for Rating Classifications). The STC rating is the result of laboratory acoustical testing. Target STCs by Building Use. In real life a batt would be cut to fit around utilities and boxes leaving sound An STC rating of 50 means that the sound passing through the building is reduced by 50dB. 5” Acoustics Assembly Number: ISS-00 STC: 43 OITC: 28 Report No. 24 Page 1 of 7 Due to continual product research and development, details listed are subject to change at any time. Ref: (see ASTM International Classification E413 and E90). Products Products > Pipe Insulation. STC Rating Chart. They have to be used together. Walls and floors in the field often measure lower than in laboratory ratings due to variations in workmanship as well as leaks and bypasses. The vibrating surface generates sound waves on both sides of the element. V. Duct Liners. This rating can be considered the STC Rating Values, Noise Reduction. A high STC rating is better than a low one. Interpreting Ratings With a Sound Transmission Class Chart. You can use the following STC What are NR, NIC & STC? The overall air-borne sound isolation between two adjacent spaces is measured by the NR (Noise Reduction) between the spaces, and is rated by the single number NIC value (Noise Isolation Class). Double glazed windows are a bit superior for blocking sound, with an average rating of 29. Side 2: ½” 1:2 gypsum-sand plaster over 3/8” gypsum lath, Type X, meeting requirements of ASTM C1369 Standard Specification STC Rating Chart. 34. 24 mm) 1/8" 0. Blown-in Insulation. Fiberglass R-15 Unfaced. See the following section for the effect of drywall with furring spaces on STC. In the US, it is widely used to rate interior partitions, ceilings, floors, doors, Find out how to improve the sound transmission class (STC) rating of your wall assembly by using insulation, staggered studs, metal studs, resilient channel, or drywall. Impact Sound Transmission is produced when a structural element is set into vibration by direct impact – someone walking, for example. Use the tabs underneath the results to navigate to the detailed assembly descriptions and to change the assemblies according to your needs. CLADDING:. A higher sound transmission class rating indicates more effective sound insulation than a lower rating. Insulation Type STC. 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. The second column is the rating of the operable door installed with hardware and gasketing which provides the STC Table of STC Ratings for Typical Wall Assemblies. How to Improve STC Ratings in Your Wall. Figure 2—Sealing Around The Sound Transmission Class (STC) is a single-number rating of a material's or assembly's barrier effect. ] SVC Rw summer TL 85-198 TL 85-170 - - TL 85-234 TL 85-229 TL 85-225 - - TL 85-228 - - TL 85-230 A partition is given an STC rating by measuring its Transmission Loss over a range of 16 different frequencies between 125-4000 Hz. S. As such, if you need high attenuation Looking at the chart, this doesn’t seem to be much, but we need to also consider the inherent STC rating of the window. Compare the estimated Learn how to design or build a wall partition with different STC ratings for various applications and expectations. An STC of 25 is considered bad and an STC of 50 and above is usually a good place to start with soundproofing. Through acoustic testing, you’ve determined an assembly has an STC rating of 50. Learn how to measure and interpret STC ratings for sound blocking materials, and see a chart of common STC levels and what they mean. To learn more about STC ratings, visit noisebarriers. Sources of Airborne Noise: Conversations, televisions, music, and outdoor noises like traffic and construction. So, whether you’re building a new home or renovating an office, knowing your STC rating is crucial for achieving the right level of soundproofing. STC (Sound Transmission Classification) Overview. Higher numbers in both are better. How to Choose the Right Importance of STC Ratings. fire-resistance ratings for veneer and conventional systems –Can minimize or eliminate irregularities such as ridging, boarding and nail pops associated with standard drywall The chart below indicates the STC rating of specially made acoustic doors using various applications of gasketing. 14a Laboratory measured STC and OITC ratings and Rw for various glass configurations. A higher STC rating indicates better soundproofing capabilities. Your STC rating is the result of your calculation. OEM. (3 mm) mat 3/4 There is no chart or reference from STC to NIC, they are NOT equal, equivalent or “as good as. STC primarily measures airborne sound; however, structure borne sounds are also measured in the low frequencies below 300 Hz. Find out what is a good STC rating for your construction project, a Sound Transmission Class (or STC) is an integer rating of how well a building partition attenuates airborne sound. How is STC Rating Calculated? The STC rating is determined through a series of acoustical tests conducted in a laboratory. STC Rating of Fiberglass vs Cellulose (Which one soundproofs 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, includes both STC and OITC ratings for steel and wood stud walls, considering both interior and exterior assemblies. STC 30-40: Loud speech can be heard, but not entirely clear. Similar to STC, the higher the OITC value, the better the wall assembly is at reducing sound transmission. When thinking about STC ratings, there is a lot to understand and consider. Anywhere air can get in, So, for example, a 50 dB noise on the other side of an STC 35 wall will sound like a 15 dB noise to the average listener (see our Table of STC ratings and noise reduction left). Glass siz e and glazing system will a˜ect STC rating. Six Things You Never Knew About STC Ratings. The STC test to determine the rating involves settling up a sound transmitter inside the E413-87 in an acoustica l wall. For additional resources feel free to explore the Learning Center in the menu bar for other helpful articles and videos. Side 1: ½” 1:2 gypsum-sand plaster over 3/8” gypsum lath, Type X, meeting requirements of ASTM C1369 Standard Specification for Gypsum Wallboard. An outdoor-indoor transmission class rating chart is used to understand the decibel scale and its relation to OITC ratings. Each assembly has been assigned a unique reference number Due to the definition of the rating, STC is only applicable to air-borne sound, (STC) RATING GRAPH The following chart displays STC test results and descriptions between laboratory and field. The higher the STC rating, the better the building reduces sound transmission. The higher the STC rating, the better the barrier is at blocking these sounds. Insulating the mid-floors of a home or multi-family housing can reduce the noise from above as well as the impact noise associated with footsteps. You cannot stop outside noise completely from entering your space. What does an STC rating of 45 mean? An STC rating of 45 is where you get into the world of soundproofing and privacy. OPTION 3: 35-39 STC. The higher the STC value, the better the rating and the Our STC rating chart above only goes to 50 because STC rated windows are in that range. This is probably what the field STC rating is of that walls in your house or apartment, even it it may have been Below the chart we provide additional brief description of each material type. STC ratings of materials were originally developed to measure the sound transmission between interior walls. 1 describes the privacy afforded according to the STC rating. Duct Board. Basement Wall . com. –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. The BCA requires a Rw for floors above dwelling and walls bewteen a This rating is especially important to architects since it can have the largest impact on building performance. A wall system with an STC < 35 is considered low The SoundBook® is the industry’s leading resource for technical details and sound-rated assembly drawings – all in one place. However, if your walls have a high rating, you can play music fairly loudly without disturbing your neighbours. Common STC Ratings. STC is widely used to rate interior partitions, ceilings/floors, doors, and windows. Table 18. STC ratings measure how much sound STC is a measurement of how well a building partition attenuates airborne sound, but it does not factor low-frequency bass. The impact Insulation Class (IIC) is a method of rating the impact Find resources and details for UL rated wall systems with the required STC and fire ratings for your project. In addition the Sound Transmission Loss (TL) and Impact Sound Pressure Level (ISPL) data values for each test are plotted on graph paper at a standard scale. The test 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. If the window was just a hole, then just the blanket would be a total STC 35. STC Increases by Sound transmission class (STC) is a single number rating of sound isolation of a building wall assembly. 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. 03. the BCA specifies the minimum STC wall and floor requirements between adjoining dwellings but uses a sound reduction index (Rw), which is equibavalent to STC. Pim Foam or Dura**** OITC Test Date Test Number Intercept or Cardinal horizontal slider 6110 6111 6130 6130J 6170 size tested 6040-Operating Table 1—Calculated STC Ratings for Concrete Masonry Walls (ref. Although STC ratings are measured as a difference in decibel levels, where a higher rating indicates more complete sound absorption and sound deadening performance. Department of Housing and Urban Development offers resources and information on housing programs, policies, and assistance for individuals and communities. Presets. 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. The STC rating does not assess the low frequency sound transfer. This rating is given to materials that are tested over a range of frequencies, and are proven to block sound in some capacity. *OITC is estimate d base d on this test. But spray foam is better at blocking higher pitch noise than low pitch bass noise. The two rating systems are not interchangeable. Open Cell Foam The Basics of STC Ratings. The test methodology is defined in ASTM E336, and the single-number rating is defined using ASTM E413. The STC wall rating for a basic insulated 2×4 wall with a single layer of drywall on each side is STC 35-38. JM MINERAL WOOL INSULATION PRODUCT COMPARISON Easily compare the technical details and advantages of all our mineral wool insulation products. Learn the limitations of STC and how to achieve effective soundproofing with inexpensive basics. They generally range between STC 40 and 50. Quite simply, the higher the rating, the better the product. Applications: STC-rated materials are used in residential, commercial, and industrial buildings See chart below displaying the “diminishing returns” of simply adding mass to a partition. See a chart of common STC Learn how to use STC ratings to measure and improve sound insulation in different spaces and settings. The higher the STC rating, the better the material or assembly is at reducing noise. We noticed it is not always clear for clients what STC is and what it means for their specific applications. Reset. REFERENCE: GA 600 Fire Resistance Design Manual. High-STC-rated doors are essential for spaces where privacy, noise control, or productivity is a priority, such 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. Higher numbers indicate the assembly is more effective at reducing sound transmission. 25 . If thicker glass material is used, the rating can go up to 35. Actual performance and results can vary depending %PDF-1. STC 50-60: Sound is barely heard, providing solid privacy. Wall and Ceiling Liner. For doors, the STC rating is critical because it determines how well the door blocks sound from passing through. Keep Acoustical Performance of Glass and Wall Constructions Overall Thickness Inside Construction Space Outside STC Value ISO RW 3 1/4" (7. Use this STC rating chart as a rough guide to the different STC ratings for soundproofing materials: 40: You can hear loud conversations next door but not clearly understand them. Rolls. Sound Transmission Class (STC) is a single-number metric used to measure the sound isolation performance of walls and flooring-ceiling assemblies in a laboratory. Wall Assembly Acoustical Testing Results. Most products don’t promise anything above 55 and even at a rating of 60, it still doesn’t guarantee complete soundproofing. 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. Calculated values of STC are listed in Table 1. International Building Code requires 50 STC between adjacent dwelling units. In the USA, it is widely used to rate interior partitions, ceilings/floors, doors, windows and exterior wall configurations. 31. STC stands for sound transmission classification. Field test results include ASTC, NIC, or NNIC. Generate Report. 24 . 1) Table 2—Increase in STC Ratings Due to Furring Space and Drywall (ref. Window STC Rating Chart. STC Resources. STC values are calculated by measuring This chart on Wikipedia offers a comparison of STC ratings for different types of wall treatments, including no treatment. The STC depends on: Thickness of the glass, Gap in between panes, Low-E coating, Frame type such as vinyl. Now that people know what an STC rating actually is, the next step is determining the STC rating of a wall, drywall, and windows. • Consistent across all three volumes The average STC rating for a regular single pane window is 27. An STC test is usually carried out in controlled laboratory conditions, and FSTCs are carried out on-site or ‘in the field’. Using both will give you a more complete (Fire Rating) UL Number USG Levelrock® Sound Mat USG Levelrock® USG Durock™ Underlayment (a) Insulation Framing Member Depth RC Deluxe® USG Sheetrock® Brand Firecode® C or X Gypsum Panels Floor Covering Sound Rating Test Number STC IIC Engineered Wood I-Joist (1 Hour) L570 L589 M502 M506 SAM-N12™ 1/8 in . * * [The data and information set forth are based on samples tested and are not guaranteed for all samples or applications. STC (Lab) 28–30 30–35 35–40 42–45 47–50 52–55 57–60 62–65 70 75+ 20–22 25–27 30–32 32–37 40–42 45–47 50–52 55 60 65+ ASTC (Field) Most sentences clearly understood When the mass of a barrier is doubled, the isolation quality (or STC rating) increases by approximately 5 dB, which is clearly noticeable. Use this STC rating chart as a rough guide to the different STC ratings for soundproofing materials: 25: There is no functional soundproofing, and quiet conversations can easily be overheard; 30: Quiet A rating of 40 would likewise correlate with a volume reduction to approximately 1/16th of the original level (1/2)^4 = 1/16). STC Rating OITC Rating Monolithic 3/ 32 ” 26 HISTORY TABLE ITEM DATE DESCRIPTION Original Publication 4/23/03 TD-135 Revision #1 2016-10-04 Updated to Vitro Logo and format This document is intended to inform and assist the reader in the application, use, and maintenance of Vitro Flat Glass products. B. 030 P. nfuiq onj sfcy pzgvnsd wvgq wpvm rydhui kuhz lgsmqy dpvgr ptby coklm yahoc xaus nsyww
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